Speeding Up Quantum Measurement Using Space-Time Trade-Off

Chris R Corlett; Ieva Cepaite; Andrew Daley; Cica Gustiani; Gerard Pelegri; Jonathan Pritchard; Noah Linden; Paul Skrzypczyk

doi:10.1103/PhysRevLett.134.080801

Speeding Up Quantum Measurement Using Space-Time Trade-Off

Chris R Corlett, Ieva Cepaite, Andrew Daley, Cica Gustiani, Gerard Pelegri, Jonathan Pritchard, Noah Linden, Paul Skrzypczyk

Research output: Contribution to journal › Article (Academic Journal) › peer-review

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Abstract

We present a scheme for speeding up quantum measurement. The scheme builds on previous protocols that entangle the system to be measured with ancillary systems. In the idealized situation of perfect entangling operations and no decoherence, it gives an exact space-time trade-off meaning the readout speed increases linearly with the number of ancilla. We verify this scheme is robust against experimental imperfections through numerical modeling of gate noise and readout errors, and under certain circumstances our scheme can even lead to better than linear improvement in the speed of measurement with the number of systems measured. This hardware-agnostic approach is broadly applicable to a range of quantum technology platforms and offers a route to accelerate midcircuit measurement as required for effective quantum error correction.

Original language	English
Article number	080801
Number of pages	8
Journal	Physical Review Letters
Volume	134
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.134.080801
Publication status	Published - 27 Feb 2025

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© 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Research Groups and Themes

Bristol Quantum Information Institute
QITG
Quantum Engineering Centre for Doctoral Training

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abstract = "We present a scheme for speeding up quantum measurement. The scheme builds on previous protocols that entangle the system to be measured with ancillary systems. In the idealized situation of perfect entangling operations and no decoherence, it gives an exact space-time trade-off meaning the readout speed increases linearly with the number of ancilla. We verify this scheme is robust against experimental imperfections through numerical modeling of gate noise and readout errors, and under certain circumstances our scheme can even lead to better than linear improvement in the speed of measurement with the number of systems measured. This hardware-agnostic approach is broadly applicable to a range of quantum technology platforms and offers a route to accelerate midcircuit measurement as required for effective quantum error correction.",

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AU - Pelegri, Gerard

AU - Pritchard, Jonathan

AU - Linden, Noah

AU - Skrzypczyk, Paul

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AB - We present a scheme for speeding up quantum measurement. The scheme builds on previous protocols that entangle the system to be measured with ancillary systems. In the idealized situation of perfect entangling operations and no decoherence, it gives an exact space-time trade-off meaning the readout speed increases linearly with the number of ancilla. We verify this scheme is robust against experimental imperfections through numerical modeling of gate noise and readout errors, and under certain circumstances our scheme can even lead to better than linear improvement in the speed of measurement with the number of systems measured. This hardware-agnostic approach is broadly applicable to a range of quantum technology platforms and offers a route to accelerate midcircuit measurement as required for effective quantum error correction.

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Speeding Up Quantum Measurement Using Space-Time Trade-Off

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