TY - JOUR
KW - General Physics and Astronomy
AU - Eric Rosenthal
AU - Christian Schneider
AU - Maxime Malnou
AU - Ziyi Zhao
AU - Felix Leditzky
AU - Benjamin Chapman
AU - Waltraut Wustmann
AU - Xizheng Ma
AU - Daniel Palken
AU - Maximilian Zanner
AU - Leila Vale
AU - Gene Hilton
AU - Jiansong Gao
AU - Graeme Smith
AU - Gerhard Kirchmair
AU - Konrad Lehnert
AB - Superconducting qubits are a leading platform for scalable quantum computing and quantum error correction. One feature of this platform is the ability to perform projective measurements orders of magnitude more quickly than qubit decoherence times. Such measurements are enabled by the use of quantum-limited parametric amplifiers in conjunction with ferrite circulators—magnetic devices which provide isolation from noise and decoherence due to amplifier backaction. Because these nonreciprocal elements have limited performance and are not easily integrated on chip, it has been a long-standing goal to replace them with a scalable alternative. Here, we demonstrate a solution to this problem by using a superconducting switch to control the coupling between a qubit and amplifier. Doing so, we measure a transmon qubit using a single, chip-scale device to provide both parametric amplification and isolation from the bulk of amplifier backaction. This measurement is also fast, high fidelity, and has 70% efficiency, comparable to the best that has been reported in any superconducting qubit measurement. As such, this work constitutes a high-quality platform for the scalable measurement of superconducting qubits.
BT - Physical Review Letters
DA - 2021-03
DO - 10.1103/physrevlett.126.090503
IS - 9
N2 - Superconducting qubits are a leading platform for scalable quantum computing and quantum error correction. One feature of this platform is the ability to perform projective measurements orders of magnitude more quickly than qubit decoherence times. Such measurements are enabled by the use of quantum-limited parametric amplifiers in conjunction with ferrite circulators—magnetic devices which provide isolation from noise and decoherence due to amplifier backaction. Because these nonreciprocal elements have limited performance and are not easily integrated on chip, it has been a long-standing goal to replace them with a scalable alternative. Here, we demonstrate a solution to this problem by using a superconducting switch to control the coupling between a qubit and amplifier. Doing so, we measure a transmon qubit using a single, chip-scale device to provide both parametric amplification and isolation from the bulk of amplifier backaction. This measurement is also fast, high fidelity, and has 70% efficiency, comparable to the best that has been reported in any superconducting qubit measurement. As such, this work constitutes a high-quality platform for the scalable measurement of superconducting qubits.
PB - American Physical Society (APS)
PY - 2021
T2 - Physical Review Letters
TI - Efficient and Low-Backaction Quantum Measurement Using a Chip-Scale Detector
UR - https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.090503
VL - 126
SN - 0031-9007, 1079-7114
ER -