Mid-circuit correction of correlated phase errors using an array of spectator qubits

Singh, K.; Bradley, C. E.; Anand, S.; Ramesh, V.; White, R.; Bernien, H.

doi:10.1126/science.ade5337

Mid-circuit correction of correlated phase errors using an array of spectator qubits

Journal Article · 23 June 2023 · Science

DOI:https://doi.org/10.1126/science.ade5337· OSTI ID:2425736

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Intelligence Community Postdoctoral Research Fellowship Program, Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA.
Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL 60637, USA.
Department of Physics, University of Chicago, Chicago, IL 60637, USA.

Scaling up invariably error-prone quantum processors is a formidable challenge. Although quantum error correction ultimately promises fault-tolerant operation, the required qubit overhead and error thresholds are daunting. In a complementary proposal, colocated, auxiliary “spectator” qubits act as in situ probes of noise and enable real-time, coherent corrections of data qubit errors. We used an array of cesium spectator qubits to correct correlated phase errors on an array of rubidium data qubits. By combining in-sequence readout, data processing, and feedforward operations, these correlated errors were suppressed within the execution of the quantum circuit. The protocol is broadly applicable to quantum information platforms and establishes key tools for scaling neutral-atom quantum processors: mid-circuit readout of atom arrays, real-time processing and feedforward, and coherent mid-circuit reloading of atomic qubits.

Research Organization:: Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0014664

OSTI ID:: 2425736

Journal Information:: Science, Journal Name: Science Journal Issue: 6651 Vol. 380; ISSN 0036-8075

Publisher:: AAAS

Country of Publication:: United States

Language:: English

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