Speeding up quantum measurement using space-time trade-off

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Corlett, Chris and Cepaite, Ieva and Daley, Andrew and Gustiani, Cica and Pelegri, Gerard and Pritchard, Jonathan and Linden, Noah and Skrzypczyk, Paul (2025) Speeding up quantum measurement using space-time trade-off. Physical Review Letters. ISSN 1079-7114 (In Press)

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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 idealised situation of perfect entangling operations and no decoherence, it gives an exact space-time trade-off meaning the readout time reduces linearly with the number of ancilla. We verify this scheme is robust against experimental imperfections through numerical modelling 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 mid-circuit measurement as required for effective quantum error correction.

ORCID iDs

Corlett, Chris, Cepaite, Ieva, Daley, Andrew ORCID logoORCID: https://orcid.org/0000-0001-9005-7761, Gustiani, Cica, Pelegri, Gerard, Pritchard, Jonathan ORCID logoORCID: https://orcid.org/0000-0003-2172-7340, Linden, Noah and Skrzypczyk, Paul;
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