Dynamically generated decoherence-free subspaces and subsystems on superconducting qubits - INSPIRE

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Dynamically generated decoherence-free subspaces and subsystems on superconducting qubits

Gregory Quiroz
(
- Johns Hopkins U.
)
,
Bibek Pokharel
(
- Southern California U. and
- CIT-USC
)
,
Joseph Boen
(
- Johns Hopkins U.
)
,
Lina Tewala
(
- Johns Hopkins U. and
- Zurich U. and
- PSI, Villigen
)
,
Vinay Tripathi
(
- CIT-USC and
- Southern California U.
)

Feb 11, 2024

20 pages

Published in:

Rept.Prog.Phys. 87 (2024) 9, 097601,
Rept.Prog.Phys. 87 (2024) 097601

Published: Aug 14, 2024

e-Print:

2402.07278 [quant-ph]

DOI:

10.1088/1361-6633/ad6805

View in:

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Abstract: (IOP)

Decoherence-free subspaces and subsystems (DFS) preserve quantum information by encoding it into symmetry-protected states unaffected by decoherence. An inherent DFS of a given experimental system may not exist; however, through the use of dynamical decoupling (DD), one can induce symmetries that support DFSs. Here, we provide the first experimental demonstration of DD-generated decoherence-free subsystem logical qubits. Utilizing IBM Quantum superconducting processors, we investigate two and three-qubit DFS codes comprising up to six and seven noninteracting logical qubits, respectively. Through a combination of DD and error detection, we show that DFS logical qubits can achieve up to a 23% improvement in state preservation fidelity over physical qubits subject to DD alone. This constitutes a beyond-breakeven fidelity improvement for DFS-encoded qubits. Our results showcase the potential utility of DFS codes as a pathway toward enhanced computational accuracy via logical encoding on quantum processors.

Note:

20 pages, 15 figures

quantum control
quantum error correction
quantum error suppression

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Figures(15)

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