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 language | English (US) |
|---|---|
| Article number | 062307 |
| Journal | Physical Review A |
| Volume | 90 |
| Issue number | 6 |
| DOIs | |
| State | Published - Dec 2 2014 |
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ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
Cite this
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 journal › Article
}
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.
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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 -