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Jared Yamaoka15/06/2026, 08:45
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Ryan Linehan (Fermi National Accelerator Laboratory)15/06/2026, 09:00
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Birgit Zatschler15/06/2026, 09:30
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Israel Hernandez (Illinois Institute of Technology)15/06/2026, 09:50
Understanding energy transport in low-temperature detectors is essential for rare-event searches, quantum sensing applications, and studies of radiation-induced effects in matter. In this work, we extend the G4CMP framework to describe charge transport in sapphire, motivated by applications in dark matter searches and cryogenic radiation detection. For sapphire, a material of growing interest...
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David Sadek15/06/2026, 10:05
Modeling phonon-mediated signals in solid state detectors with TES readout requires connecting crystal phonon transport to the electrothermal response of the sensor. This talk presents a framework coupling G4CMP to a TES electrothermal simulation for pulse shape modeling and tuning against SuperCDMS HVeV detector data, with successful reproduction of LED calibration spectra. A key outcome is...
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Caitlyn Stone-Whitehead (Colorado School of Mines)15/06/2026, 10:20
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Selby Dang (SLAC)15/06/2026, 10:55
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Jake Inman15/06/2026, 11:10
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Eric Mascot15/06/2026, 11:25
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Paul Baity (Brookhaven National Laboratory)15/06/2026, 11:40
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David Kealhofer15/06/2026, 11:55
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Ryan Linehan (Fermi National Accelerator Laboratory)15/06/2026, 13:40
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Jake Inman, Jesse Lutz15/06/2026, 13:40
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Stefan Zatschler (SLAC)15/06/2026, 15:30
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15/06/2026, 16:15
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Britton Plourde16/06/2026, 09:00
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Daniel Baxter (Fermi National Accelerator Laboratory)16/06/2026, 09:15
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Alex Opremcak (Google Quantum AI)16/06/2026, 10:45
One of the roadblocks towards the implementation of a fault-tolerant superconducting quantum processor is impacts of ionizing radiation with the qubit substrate. Such impacts temporarily elevate the density of quasiparticles (QPs) across the device, leading to correlated qubit error bursts. The most damaging errors—T1 errors—stem from QP tunneling across the qubit Josephson junctions (JJs)....
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Bradley Christensen (Northrop Grumman)16/06/2026, 11:15
We will discuss devices that have microwave kinetic inductance detectors (MKIDs) fabricated on the same substrate as qubits to assessing the impact of ionizing radiation. We will present our results using the MKIDs as a radiation sensor to look for correlations between detected events and two-level system dynamics: we observe no correlation in our data. We will also compare the recovery time...
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Heekun Nho (Yale University)16/06/2026, 13:30
Ionizing radiation impacts create bursts of quasiparticle density in superconducting qubits. These bursts temporarily degrade qubit coherence, which can be detrimental for quantum error correction. Here, we experimentally resolve quasiparticle bursts in 3D gap-engineered transmon qubits by continuously monitoring qubit transitions. Gap engineering allows us to reduce the burst detection rate...
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Jeffrey Gertler (MIT Lincoln Laboratory)16/06/2026, 14:00
Spatiotemporally correlated error bursts, arising from quasiparticles generated by ionizing radiation and mechanical noise, pose significant challenges to implementing quantum error correction in superconducting quantum processors. In this work, we explore methods for detecting these errors in two superconducting circuits: offset charge sensitive (OCS) transmons and Fluxonium. In OCS...
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Britton Plourde (University of Wisconsin, Madison)16/06/2026, 14:30
In addition to radiation impacts, superconducting qubit arrays can be subject to correlated quasiparticle poisoning from nonionizing sources that also result in bursts of pair-breaking phonons. We observe elevated correlated and single-qubit poisoning rates in superconducting qubit arrays at the start of a cooldown followed by power-law reductions in time, while the rate of offset charge...
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Matt Pyle (University of California, Berkeley)16/06/2026, 15:45
In the last decade, the sensitivity of superconducting athermal phonon detectors has improved by nearly two orders of magnitude, driven largely by the scientific need to search for dark matter with smaller masses and thus smaller energy depositions. Though these detectors are fabricated using nearly identical materials and fabrication techniques as those used for superconducting qubits, they...
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Marios Samiotis (QuTech & Kavli Institute of Nanoscience, Delft University of Technology)16/06/2026, 16:15
We investigate qubit error bursts in 5- and 7-transmon processors of similar design, fabrication and packaging, but with different types of qubit Josephson junctions. The duration and rate of bursts are device specific but within the range of prior experiments and consistent with ionizing radiation. We observe two unforeseen signatures specifically in the processor with Dolan junctions. First,...
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Lanqing Yuan (Washington University in St. Louis)16/06/2026, 16:45
The QUAntum LImited PHotons In the Dark Experiment (QUALIPHIDE) is a cryogenic broadband search for light dark matter candidates, primarily looking for signatures of massive hidden photons kinetically mixing with Standard Model photons. We report results from an experimental campaign coupling a focusing metallic dish to a pixelated array of energy-resolving $\sim$3 to $\sim$120THz sensitive...
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Leonid I. Glazman (Yale University)17/06/2026, 09:00
We evaluate the quasiparticle contribution to the frequency shift and relaxation rates of a transmon with the Josephson junctions connecting superconductors that have unequal energy gaps. The gap difference substantially affects the transmon characteristics. We investigate their dependence on the density and effective temperature of the quasiparticles, and on the nominal (unperturbed by the...
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Gabrielle Roberts (Google Quantum AI)17/06/2026, 09:30
Quantum error correction fundamentally requires that physical errors are sufficiently uncorrelated in time and space. In superconducting qubit processors, impacts from ionizing radiation violate this assumption by elevating quasiparticle density across the substrate, triggering correlated qubit error bursts. Previously, we demonstrated that the most damaging of these—correlated T1 errors...
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Dr Yaniv Rosen (LLNL)17/06/2026, 10:45
Quantum error correction (QEC) protocols for superconducting qubits assume spatially and temporally uncorrelated decoherence events. However, recent evidence has seen large chip disruption due to cosmic rays. Some of these events are mitigated by gap engineering the qubits, but some effects still remain. We present a platform that sandwiches a superconducting transmon qubit between two...
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Tanay Roy (FNAL)17/06/2026, 11:15
Superconducting qubits are highly sensitive to ionizing radiation, which can induce correlated errors and limit scalable fault-tolerant quantum computing. In particular, cosmic-ray muons can deposit energy in the substrate, generating phonon bursts that break Cooper pairs and produce quasiparticles, leading to correlated decoherence events across multiple qubits. We present the development of...
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Joel Ullom (NIST)17/06/2026, 11:45
In this presentation we describe ongoing work at NIST with circuits that combine qubit arrays and superconducting transition-edge sensors (TESs) on the same silicon substrate. The TESs are intended to serve two purposes. Because the TESs are fabricated directly on the silicon, they are sensitive to phonons created in the substrate by background radiation and thus they provide an on-chip,...
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Tom McJunkin (Johns Hopkins Applied Physics Laboratory)17/06/2026, 14:00
The CLIQUE (Controlled Linac Irradiation of Quantum Experiments) Facility at Johns Hopkins Applied Physics Laboratory is an experimental user facility that contains an electron linear accelerator (linac) used as an on-demand high-energy particle source to study deleterious effects on quantum systems. The linac provides a pulsed, microsecond burst of ~20 MeV electrons that are redirected at a...
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Doug Pinckney (MIT)17/06/2026, 14:30
Impacts from high-energy particles have been demonstrated to cause correlated errors in superconducting qubits by increasing the quasiparticle density in the Josephson junction (JJ) leads. These correlated errors are particularly harmful as they cannot be remedied via conventional error correcting codes. It was recently demonstrated that these correlated errors can be reduced or eliminated by...
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Isaac Arnquist (PNNL)17/06/2026, 15:00
Environmental radioactivity has been increasingly recognized as a limiting factor in the performance of superconducting quantum devices. Trace-level contamination in materials comprising dilution refrigerators and qubit packaging can produce ionizing radiation that generates quasiparticles, contributing to correlated error bursts and decoherence. Understanding and mitigating these effects...
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Samuel Watkins (Pacific Northwest National Laboratory)17/06/2026, 15:15
Correlated error bursts causing decoherence in superconducting qubits have been detrimental to quantum error correction schemes, with recent work by Google showing approximately once per hour correlated bursts in their qubits. Over the past decade, it has been shown that ionizing radiation contributes to this effect, with cosmic rays being commonly identified. However, with advent of...
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Mark Eriksson (University of Wisconsin-Madison)17/06/2026, 16:15
In this talk we report the observation of offset charge jumps induced by external radiation in Si/SiGe quantum dots that serve as spin qubits. Such charge jumps are important for quantum dot qubits, because they directly alter the operating point of the qubit in gate voltage space, and such uncontrolled shifts can induce errors in qubit initialization, readout, and manipulation. Using the...
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Joshua Lou (University of Maryland)17/06/2026, 16:45
Spin qubits have seen much progress over recent years, proving to be an appealing candidate for scalable quantum computing with small footprints, electrical control, promising coherence times, and the industry-compatible silicon material platform. As advances are made in the spaces of control and scaling, addressing noise from various origins becomes increasingly pertinent. It has been shown...
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Alberto Ressa (Istituto Nazionale di Fisica Nucleare)18/06/2026, 09:00
Superconducting qubits are susceptible to transient energy deposition arising from cosmic rays and environmental radioactivity. High-energy phonons generated by particle interactions in the qubit chip substrate can create quasiparticles that temporarily degrade qubit coherence.
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We investigate the qubit response under controlled irradiation using a proximal Radium-224 source. To identify... -
Emanuela Celi (Northwestern University)18/06/2026, 09:30
When an ionizing particle interacts with the substrate of a superconducting qubit chip, it generates high-energy athermal phonons that propagate through the material, breaking Cooper pairs in the superconducting films and inducing quasiparticle poisoning. These non-equilibrium quasiparticles limit qubit coherence times and introduce correlated errors across large qubit arrays, posing a major...
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Hannah Magoon (Stanford University)18/06/2026, 10:00
The Superconducting Quasiparticle-Amplifying Transmon (SQUAT) is a sensor architecture targeting meV (THz) detection based on a weakly charge-sensitive transmon qubit directly coupled to a transmission line. Energy depositions in the qubit capacitor generate quasiparticles that tunnel across the Josephson junction. Each tunnel changes the qubit parity and produces a measurable signal in CW...
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18/06/2026, 11:15
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18/06/2026, 11:45
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Paul Baity (Brookhaven National Laboratory)
Radiation impacts are a leading cause of information degradation in superconducting quantum devices due to their frequency in occurrence and instigation of widespread correlated errors. Recent developments [1] have built Monte-Carlo models using Geant4 and G4CMP to track the generation of e/h pairs, phonons, and superconducting quasiparticles. Building upon this work, we have developed...
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Rohan Shenoy (Caltech)
Superconducting circuits (SCCs) are a favored platform for quantum computing. One potential source for decoherence in systems like the transmon is pair-breaking black body radiation. Currently no end-to-end simulation package exists to model the emission, and propagation of black body photons in experimental setups. Geant4, the state of the art particle physics simulation software, can only...
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Brennan Coffey (UC Berkeley, Lawrence Berkeley National Lab)
Calibrating ultra-sensitive THz/meV detectors in cryogenic environments is a challenging pursuit, as conventional fiber optics suffer greatly from loss and tunable sources are limited. A system composed of a high-frequency photomixer coupled to a hollow cylindrical waveguide is being developed to deliver tunable frequency THz photons to cryogenic sensors. This work is motivated by the need to...
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Elijah Kane (NASA JPL)
The Probe Far-Infrared Mission for Astrophysics (PRIMA) is a probe-class space observatory currently under Phase A study by NASA. PRIMA’s cryogenically cooled primary mirror promises orders-of-magnitude improvements in mapping speed over its predecessors in far-infrared astronomy, Herschel and Spitzer. Arrays of microwave kinetic inductance detectors (MKIDs) with noise equivalent powers of...
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Dylan Temples (Fermilab)
The effects of long-lived, unstable radon daughters that ``plate-out" on surfaces are well known to the fields of dark matter direct detection and rare-event searches. This plate-out produces a localized source of ionizing radiation ($\alpha$-rays and recoils of heavy nuclei) extending from the material surface to a few microns into the bulk. In recent studies, ionizing radiation in the form...
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Arianna Colon Cesani (Northwestern University, CosmiQ Collaboration)
The Quantum Underground Instrumentation Experimental Testbed (QUIET) is a laboratory 100 meters underground at Fermilab designed to support advanced research in quantum computing and cryogenic detectors. Equipped with a 10 mK dilution refrigerator, QUIET enables the low-background characterization of superconducting qubits and detectors in a controlled environment. Over a series of cooldowns,...
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29. Enabling Spatial Correlation Measurements of Cosmic Ray Events and Qubit Errors with MKID ArraysZak Espley (Lawrence Livermore National Laboratory)
In order to understand the effects of cosmic rays on superconducting qubits we have developed a that system correlates cosmic ray events with decoherence in qubits. This system consists of a qubit chip sandwiched between two arrays of MKIDs. We recent showed that both $T_1$ and $T_2$ times decreased when events were detected on our MKIDs. Now we look to expand the capabilities of our system...
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Israel Hernandez (Illinois Institute of Technology)
Understanding the energy transport in low-temperature detectors is essential for rare-event searches, quantum sensing applications, and studies of radiation-induced effects in matter. In this work, we extend the G4CMP framework to describe charge transport in sapphire and the collective excitations in superfluid helium as phonons and rotons. For sapphire, a material of growing interest in...
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Mr Julian Englhardt (Walther-Meissner-Institute)
Temporal fluctuations in the energy relaxation time ($T_1$) of superconducting qubits can occur on fast and irregular timescales. A quantitative understanding of these nonstationary relaxation dynamics is important for improving qubit stability and advancing fault-tolerant quantum processors. Here, we employ a new method for continuous monitoring of qubit relaxation based on an input–output...
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Kiichi Okubo (University of Wisconsin - Madison)
The impact of ionizing radiation, such as gamma rays and cosmic ray muons, on superconducting qubit chips results in the generation of electron-hole pairs in the substrate, as well as a cascade of pair-breaking phonons. These energetic phonons spread efficiently throughout the chip and create excess quasiparticles in the junction electrodes of any qubits present on the device layer. This...
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Mr Manabputra (UW-Madison)
High-energy events such as gamma-ray or muon impacts on superconducting qubit chips generate cascades of electron-hole pairs and pair-breaking phonons in the silicon substrate. The motion and trapping of these charges modify the local electrostatic environment, leading to measurable offset-charge shifts in nearby charge-sensitive transmons. To study these effects in a controlled manner, we...
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Ziyu Cai (Illinois Institute of Technology)
Phonon-mediated detectors have emerged as a promising technology for detecting low-energy particles, such as dark matter and neutrinos. Coupling phonons with qubit technology enables the realization of highly sensitive detectors for such particles. We have incorporated phonon transport in G4CMP for several novel materials. Similarly, we have now extended this simulation to model...
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Alejandro Rodriguez (Northwestern University)
The fabrication efforts of the COSMIQ group are focused on creating superconducting aluminum doped with manganese (Al/Mn) gap engineered films/circuits to utilize their low-band gap for both quantum sensing and computing purposes. Environmental radiation and cosmic rays produce phonons in substrates that can then cause Cooper pairs to break producing quasiparticles (QPs). With precise gap...
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Yuchen Zhu (Northwestern University)
As superconducting quantum processors scale up, physical layout decisions increasingly affect both system robustness and architectural scalability. In this poster, we present a physical-design perspective that connects two layout-driven challenges in quantum chip design. First, we study the placement of phonon and quasiparticle traps to mitigate the impact of cosmic-ray-induced events and...
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Jack Bargemann (Pacific Northwest National Lab)
There are growing efforts to use substrate-coupled kinetic inductance detectors as athermal phonon detectors for particle detection. One challenge encountered is the significant position-dependence these detectors can exhibit, destroying energy resolution of non-collimated sources. We show this position dependence can be overcome by operating the detectors to be sensitive to thermalized...
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Jaret Heise (SURF)
The Sanford Underground Research Facility (SURF) began operation in 2007 as a facility dedicated to advancing compelling multidisciplinary scientific research. SURF is one of the deepest laboratory sites and offers the largest footprint in the world for scientific pursuits, including physics campuses at a depth of 1.5 km where the LUX-ZEPLIN dark matter, CASPAR nuclear astrophysics and DUNE...
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Daniel Molenaar (Illinois Institute of Technology)
In recent years superconducting qubits have made huge strides in performance and quality. With improved qubit quality comes increasingly strict environmental requirements. One background of concern comes from black body radiation from higher temperature stages of the dilution refrigerator. IR photons are particularly challenging to shield from as many common RF materials are transparent to...
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Micah Johnson (Lawrence Livermore National Laboratory)
Superconducting quantum devices (SQDs) are at the forefront of technologies to investigate scientific phenomena such as dark matter and application spaces such as quantum computing. The performance of SQDs is affected by correlated events that are produced by naturally occurring radiation. These events deposit energy into materials, including substrates, which produce secondary particles from...
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Maksim Litskevich (Syracuse University)
Quasiparticle-induced decoherence in superconducting qubits, triggered by high-energy radiation impacts or sudden mechanical stress relief, is a leading source of correlated errors that limit the performance of fault-tolerant quantum error correction schemes. Although fluxonium qubits are a promising alternative to transmon qubits, quasiparticle effects in fluxonium devices remain far less...
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Jonas de Lima (University of Konstanz)
It is well known that cosmic rays create high energy phonon bursts in the substrate of superconducting qubit devices, which is typically made of silicon or sapphire. It is also known that the electron-phonon interaction induces spin relaxation on spin qubits in silicon quantum dots, which can affect their performance. In this work, we are preemptively investigating the effects of cosmic...
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Grace Bratrud (Northwestern University)
Ionizing radiation incident on a superconducting qubit chip can cause phonon excitations and trapped charges. The phonon can generate non-equilibrium quasiparticles in the superconductor near the qubit island, which can tunnel across the junction, interacting with the qubit energy and changing the parity of the qubit. Trapped charges change the electric field environment in nearby qubits and...
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Kester Anyang (Illinois Institute of Technology)
The interaction between superconducting qubits and quasiparticles that tunnel across the Josephson junction can be used to detect quasiparticle-generating particle scattering events, making them promising platforms for sub-eV phonon/photon sensing. Each tunneling event can flip the qubit charge parity and may also result in energy transfer between the qubit and the quasiparticle. We present a...
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Jack Bargemann (Pacific Northwest National Lab)
Both cosmogenic and terrestrial radiation are known to contribute to errors in superconducting qubits. There are multiple types and sources of ionizing radiation that can be relevant to these qubits, such as particle showers from cosmic rays, gamma radiation from surrounding earth and building materials, and radioactivity internal to the dilution fridge or qubit package itself. To investigate...
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Matthew Freeman (Sandia National Laboratories)
We experimentally investigated the prospect for using superconducting transmon qubits as cryogenic quantum sensors of ionizing radiation. We interrogated a six-qubit chip with resonators inductively coupled on both sides of a central transmission line in a hanger geometry. Measurements were performed without and with a source of ionizing radiation applied, external to the cryostat at room...
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Dr Karthik Ramanathan (Washington University in St. Louis)
The SONIQ (Sensing of Neutrinos In Qubits) collaboration aims to build arrays of superconducting qubits capable of detecting meV-scale energy deposits arising from neutrino-nucleus scattering interactions within a bulk target. We outline development of these sensors, targeting sub-eV resolution on a kg-scale germanium target. We discuss current work, touching on qubit design, the use of low Tc...
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Dr Alan Hunt (The Johns Hopkins University Applied Physics Laboratory)
The interaction of ionizing radiation with superconducting qubits can lead to large-scale correlated errors that are problematic, as they cannot be fixed by conventional error correction techniques. These radiation induced upset events have mostly been studied using the natural radiation in the environment and manmade radioactive sources, making it difficult to directly correlate the observed...
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