High-fidelity qubit measurement with a microwave-photon counter

Luke C G Govia, Emily J. Pritchett, Canran Xu, Britton Plourde, Maxim G. Vavilov, Frank K. Wilhelm, R. McDermott

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

High-fidelity, efficient quantum nondemolition readout of quantum bits is integral to the goal of quantum computation. As superconducting circuits approach the requirements of scalable, universal fault tolerance, qubit readout must also meet the demand of simplicity to scale with growing system size. Here we propose a fast, high-fidelity, scalable measurement scheme based on the state-selective ring-up of a cavity followed by photodetection with the recently introduced Josephson photomultiplier (JPM), a current-biased Josephson junction. This scheme maps qubit state information to the binary digital output of the JPM, circumventing the need for room-temperature heterodyne detection and offering the possibility of a cryogenic interface to superconducting digital control circuitry. Numerics show that measurement contrast in excess of 95% is achievable in a measurement time of 140 ns. We discuss perspectives to scale this scheme to enable readout of multiple qubit channels with a single JPM.

Original languageEnglish (US)
Article number062307
JournalPhysical Review A
Volume90
Issue number6
DOIs
StatePublished - Dec 2 2014

Fingerprint

readout
counters
microwaves
photons
fault tolerance
quantum computation
Josephson junctions
cryogenics
time measurement
requirements
cavities
output
rings
room temperature

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Govia, L. C. G., Pritchett, E. J., Xu, C., Plourde, B., Vavilov, M. G., Wilhelm, F. K., & McDermott, R. (2014). High-fidelity qubit measurement with a microwave-photon counter. Physical Review A, 90(6), [062307]. https://doi.org/10.1103/PhysRevA.90.062307

High-fidelity qubit measurement with a microwave-photon counter. / Govia, Luke C G; Pritchett, Emily J.; Xu, Canran; Plourde, Britton; Vavilov, Maxim G.; Wilhelm, Frank K.; McDermott, R.

In: Physical Review A, Vol. 90, No. 6, 062307, 02.12.2014.

Research output: Contribution to journalArticle

Govia, LCG, Pritchett, EJ, Xu, C, Plourde, B, Vavilov, MG, Wilhelm, FK & McDermott, R 2014, 'High-fidelity qubit measurement with a microwave-photon counter', Physical Review A, vol. 90, no. 6, 062307. https://doi.org/10.1103/PhysRevA.90.062307
Govia LCG, Pritchett EJ, Xu C, Plourde B, Vavilov MG, Wilhelm FK et al. High-fidelity qubit measurement with a microwave-photon counter. Physical Review A. 2014 Dec 2;90(6). 062307. https://doi.org/10.1103/PhysRevA.90.062307
Govia, Luke C G ; Pritchett, Emily J. ; Xu, Canran ; Plourde, Britton ; Vavilov, Maxim G. ; Wilhelm, Frank K. ; McDermott, R. / High-fidelity qubit measurement with a microwave-photon counter. In: Physical Review A. 2014 ; Vol. 90, No. 6.
@article{52d64ac6b72644a4951d25988449c545,
title = "High-fidelity qubit measurement with a microwave-photon counter",
abstract = "High-fidelity, efficient quantum nondemolition readout of quantum bits is integral to the goal of quantum computation. As superconducting circuits approach the requirements of scalable, universal fault tolerance, qubit readout must also meet the demand of simplicity to scale with growing system size. Here we propose a fast, high-fidelity, scalable measurement scheme based on the state-selective ring-up of a cavity followed by photodetection with the recently introduced Josephson photomultiplier (JPM), a current-biased Josephson junction. This scheme maps qubit state information to the binary digital output of the JPM, circumventing the need for room-temperature heterodyne detection and offering the possibility of a cryogenic interface to superconducting digital control circuitry. Numerics show that measurement contrast in excess of 95{\%} is achievable in a measurement time of 140 ns. We discuss perspectives to scale this scheme to enable readout of multiple qubit channels with a single JPM.",
author = "Govia, {Luke C G} and Pritchett, {Emily J.} and Canran Xu and Britton Plourde and Vavilov, {Maxim G.} and Wilhelm, {Frank K.} and R. McDermott",
year = "2014",
month = "12",
day = "2",
doi = "10.1103/PhysRevA.90.062307",
language = "English (US)",
volume = "90",
journal = "Physical Review A - Atomic, Molecular, and Optical Physics",
issn = "1050-2947",
publisher = "American Physical Society",
number = "6",

}

TY - JOUR

T1 - High-fidelity qubit measurement with a microwave-photon counter

AU - Govia, Luke C G

AU - Pritchett, Emily J.

AU - Xu, Canran

AU - Plourde, Britton

AU - Vavilov, Maxim G.

AU - Wilhelm, Frank K.

AU - McDermott, R.

PY - 2014/12/2

Y1 - 2014/12/2

N2 - High-fidelity, efficient quantum nondemolition readout of quantum bits is integral to the goal of quantum computation. As superconducting circuits approach the requirements of scalable, universal fault tolerance, qubit readout must also meet the demand of simplicity to scale with growing system size. Here we propose a fast, high-fidelity, scalable measurement scheme based on the state-selective ring-up of a cavity followed by photodetection with the recently introduced Josephson photomultiplier (JPM), a current-biased Josephson junction. This scheme maps qubit state information to the binary digital output of the JPM, circumventing the need for room-temperature heterodyne detection and offering the possibility of a cryogenic interface to superconducting digital control circuitry. Numerics show that measurement contrast in excess of 95% is achievable in a measurement time of 140 ns. We discuss perspectives to scale this scheme to enable readout of multiple qubit channels with a single JPM.

AB - High-fidelity, efficient quantum nondemolition readout of quantum bits is integral to the goal of quantum computation. As superconducting circuits approach the requirements of scalable, universal fault tolerance, qubit readout must also meet the demand of simplicity to scale with growing system size. Here we propose a fast, high-fidelity, scalable measurement scheme based on the state-selective ring-up of a cavity followed by photodetection with the recently introduced Josephson photomultiplier (JPM), a current-biased Josephson junction. This scheme maps qubit state information to the binary digital output of the JPM, circumventing the need for room-temperature heterodyne detection and offering the possibility of a cryogenic interface to superconducting digital control circuitry. Numerics show that measurement contrast in excess of 95% is achievable in a measurement time of 140 ns. We discuss perspectives to scale this scheme to enable readout of multiple qubit channels with a single JPM.

UR - http://www.scopus.com/inward/record.url?scp=84918582249&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84918582249&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.90.062307

DO - 10.1103/PhysRevA.90.062307

M3 - Article

VL - 90

JO - Physical Review A - Atomic, Molecular, and Optical Physics

JF - Physical Review A - Atomic, Molecular, and Optical Physics

SN - 1050-2947

IS - 6

M1 - 062307

ER -