Dual-rail encoding with superconducting cavities.

Autor:	Teoh JD; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Winkel P; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Babla HK; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Chapman BJ; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Claes J; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., de Graaf SJ; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Garmon JWO; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Kalfus WD; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Lu Y; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Maiti A; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Sahay K; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Thakur N; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Tsunoda T; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Xue SH; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Frunzio L; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Girvin SM; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Puri S; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511., Schoelkopf RJ; Department of Applied Physics, Yale University, New Haven, CT 06511.; Department of Physics, Yale University, New Haven, CT 06511.; Yale Quantum Institute, Yale University, New Haven, CT 06511.
Jazyk:	angličtina
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2023 Oct 10; Vol. 120 (41), pp. e2221736120. Date of Electronic Publication: 2023 Oct 06.
DOI:	10.1073/pnas.2221736120
Abstrakt:	The design of quantum hardware that reduces and mitigates errors is essential for practical quantum error correction (QEC) and useful quantum computation. To this end, we introduce the circuit-Quantum Electrodynamics (QED) dual-rail qubit in which our physical qubit is encoded in the single-photon subspace, [Formula: see text], of two superconducting microwave cavities. The dominant photon loss errors can be detected and converted into erasure errors, which are in general much easier to correct. In contrast to linear optics, a circuit-QED implementation of the dual-rail code offers unique capabilities. Using just one additional transmon ancilla per dual-rail qubit, we describe how to perform a gate-based set of universal operations that includes state preparation, logical readout, and parametrizable single and two-qubit gates. Moreover, first-order hardware errors in the cavities and the transmon can be detected and converted to erasure errors in all operations, leaving background Pauli errors that are orders of magnitude smaller. Hence, the dual-rail cavity qubit exhibits a favorable hierarchy of error rates and is expected to perform well below the relevant QEC thresholds with today's coherence times.
Databáze:	MEDLINE
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