Impact of ionizing radiation on superconducting qubit coherence

  title={Impact of ionizing radiation on superconducting qubit coherence},
  author={Antti Vepsalainen and Amir H. Karamlou and John L. Orrell and Akshunna S. Dogra and B. Loer and F. Vasconcelos and David K. Kim and A. Melville and Bethany M. Niedzielski and Jonilyn L. Yoder and Simon Gustavsson and Joseph A. Formaggio and B. A. VanDevender and William D. Oliver},
  pages={551 - 556}
Technologies that rely on quantum bits (qubits) require long coherence times and high-fidelity operations1. Superconducting qubits are one of the leading platforms for achieving these objectives2,3. However, the coherence of superconducting qubits is affected by the breaking of Cooper pairs of electrons4–6. The experimentally observed density of the broken Cooper pairs, referred to as quasiparticles, is orders of magnitude higher than the value predicted at equilibrium by the Bardeen–Cooper… 
QuFI: a Quantum Fault Injector to Measure the Reliability of Qubits and Quantum Circuits
—Quantum computing is an up-and-coming technol- ogy that is expected to revolutionize the computation paradigm in the next few years. Qubits, the primary computing elements of quantum circuits,
A Systematic Methodology to Compute the Quantum Vulnerability Factors for Quantum Circuits
The Quantum Vulnerability Factor (QVF) is proposed as a metric to measure the impact that the corruption of a qubit has on the circuit output probability distribution, and guidelines on how to map the qubits in the real quantum computer to reduce the output error and to reduced the probability of having a radiation-induced corruption to modify the output.
Material matters in superconducting qubits
  • C. Murray
  • Physics
    Materials Science and Engineering: R: Reports
  • 2021
Resolving catastrophic error bursts from cosmic rays in large arrays of superconducting qubits
Scalable quantum computing can become a reality with error correction, provided that coherent qubits can be constructed in large arrays 1 , 2 . The key premise is that physical errors can remain both
A Stress Induced Source of Phonon Bursts and Quasiparticle Poisoning
The performance of superconducting qubits is degraded by a poorly characterized set of energy sources breaking the Cooper pairs responsible for superconductivity, creating a condition often called
Membrane-less phonon trapping and resolution enhancement in optical microwave kinetic inductance detectors
Microwave Kinetic Inductance Detectors (MKIDs) sensitive to light in the ultraviolet to near-infrared wavelengths are superconducting micro-resonators that are capable of measuring photon arrival
Dynamics of a dispersively coupled transmon qubit in the presence of a noise source embedded in the control line
We describe transmon qubit dynamics in the presence of noise introduced by an impedance-matched resistor (50Ω) that is embedded in the qubit control line. To obtain the time evolution, we rigorously
Exploration of Methods to Remove Implanted $^{210}$Pb and $^{210}$Po Contamination from Silicon Surfaces
Radioactive contaminants on the surfaces of detector components can be a problematic source of background events for physics experiments searching for rare processes. Exposure to radon is a specific
Effects of Laser-Annealing on Fixed-Frequency Superconducting Qubits
As superconducting quantum processors increase in complexity, techniques to overcome constraints on frequency crowding are needed. The recently developed method of laser-annealing provides an
Quasiparticles in superconducting qubits with asymmetric junctions
Designing the spatial profile of the superconducting gap – gap engineering – has long been rec-ognized as an effective way of controlling quasiparticles in superconducting devices. In aluminum films,


Reducing the impact of radioactivity on quantum circuits in a deep-underground facility
Operating in a deep-underground lead-shielded cryostat decreases the quasiparticle burst rate by a factor thirty and reduces dissipation up to a factor four, showcasing the importance of radiation abatement in future solid-state quantum hardware.
Quantum supremacy using a programmable superconducting processor
Quantum supremacy is demonstrated using a programmable superconducting processor known as Sycamore, taking approximately 200 seconds to sample one instance of a quantum circuit a million times, which would take a state-of-the-art supercomputer around ten thousand years to compute.
Superconducting Qubits: Current State of Play
Several of the recent experimental advances in qubit hardware, gate implementations, readout capabilities, early NISQ algorithm implementations, and quantum error correction using superconducting qubits are discussed.
Materials in superconducting quantum bits
Superconducting qubits are electronic circuits comprising lithographically defined Josephson tunnel junctions, inductors, capacitors, and interconnects. When cooled to dilution refrigerator
Review of Particle Physics, 2016-2017
The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,062 new measurements from 721 papers, we list, evaluate, and average measured properties of
Quasiparticle-phonon downconversion in nonequilibrium superconductors
important for the production of quasiparticles and is shown to split into two phases. The first is controlled by the evolution of the phonon distribution while the second is dominated by
X‐ray detection using a superconducting transition‐edge sensor microcalorimeter with electrothermal feedback
We have developed a new type of x‐ray detector based on a superconducting transition‐edge thermometer operated near 100 mK. A superconducting quantum interference device is used to measure the
Protecting superconducting qubits from radiation
We characterize a superconducting qubit before and after embedding it along with its package in an absorptive medium. We observe a drastic improvement in the effective qubit temperature and over a