Post-selection-free Preparation Of High-quality Physical Qubits

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Ben Barber, Neil I. Gillespie, and J. M. Taylor

Riverlane, Cambridge, UK

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Abstract

Rapidly improving gate fidelities for coherent operations mean that errors in state preparation and measurement (SPAM) may become a dominant source of error for fault-tolerant operation of quantum computers. This is particularly acute in superconducting systems, where tradeoffs in measurement fidelity and qubit lifetimes have limited overall performance. Fortunately, the essentially classical nature of preparation and measurement enables a wide variety of techniques for improving quality using auxiliary qubits combined with classical control and post-selection. In practice, however, post-selection greatly complicates the scheduling of processes such as syndrome extraction. Here we present a family of quantum circuits that prepare high-quality |0$rangle$ states without post-selection, instead using CNOT and Toffoli gates to non-linearly permute the computational basis. We find meaningful performance enhancements when two-qubit gate fidelities errors go below 0.2%, and even better performance when native Toffoli gates are available.

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► BibTeX data

@article{Barber2023postselectionfree, doi = {10.22331/q-2023-05-04-994}, url = {https://doi.org/10.22331/q-2023-05-04-994}, title = {Post-selection-free preparation of high-quality physical qubits}, author = {Barber, Ben and Gillespie, Neil I. and Taylor, J. M.}, journal = {{Quantum}}, issn = {2521-327X}, publisher = {{Verein zur F{“{o}}rderung des Open Access Publizierens in den Quantenwissenschaften}}, volume = {7}, pages = {994}, month = may, year = {2023}<br /> }

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Cited by

[1] Adam Kinos and Klaus Mølmer, “Optical multiqubit gate operations on an excitation-blockaded atomic quantum register”, Physical Review Research 5 1, 013205 (2023).

The above citations are from SAO/NASA ADS (last updated successfully 2023-05-06 00:27:38). The list may be incomplete as not all publishers provide suitable and complete citation data.

On Crossref’s cited-by service no data on citing works was found (last attempt 2023-05-06 00:27:36).

This Paper is published in Quantum under the Creative Commons Attribution 4.0 International (CC BY 4.0) license. Copyright remains with the original copyright holders such as the authors or their institutions.

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Source: https://quantum-journal.org/papers/q-2023-05-04-994/

Time Stamp: May 4, 2023

Time Stamp: Oct 23, 2023

Post-selection-free preparation of high-quality physical qubits

Republished By Plato

Abstract

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► References

Cited by

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