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Title: Ancilla-Free Quantum Error Correction Codes for Quantum Metrology

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Yale Univ., New Haven, CT (United States)

Quantum error correction has recently emerged as a tool to enhance quantum sensing under Markovian noise. It works by correcting errors in a sensor while letting a signal imprint on the logical state. This approach typically requires a specialized error-correcting code, as most existing codes correct away both the dominant errors and the signal. To date, however, few such specialized codes are known, among which most require noiseless, controllable ancillas. We show here that such ancillas are not needed when the signal Hamiltonian and the error operators commute, a common limiting type of decoherence in quantum sensors. We give a semidefinite program for finding optimal ancilla-free sensing codes in general, as well as closed-form codes for two common sensing scenarios: qubits undergoing dephasing, and a lossy bosonic mode. Lastly, we analyze the sensitivity enhancement offered by the qubit code under arbitrary spatial noise correlations, beyond the ideal limit of orthogonal signal and noise operators.

Research Organization:
Yale Univ., New Haven, CT (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0019406
OSTI ID:
1613222
Alternate ID(s):
OSTI ID: 1492913
Journal Information:
Physical Review Letters, Vol. 122, Issue 4; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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Cited By (14)

Tensor-network approach for quantum metrology in many-body quantum systems journal January 2020
Quantum-error-correction-assisted quantum metrology without entanglement journal August 2019
Efficient Quantum Error Correction of Dephasing Induced by a Common Fluctuator journal January 2020
Nanosystems, Edge Computing, and the Next Generation Computing Systems journal September 2019
Tensor-network approach for quantum metrology in many-body quantum systems other January 2020
Fault-tolerant quantum metrology text January 2018
Quantum error correction assisted quantum metrology without entanglement text January 2019
Efficient quantum error correction of dephasing induced by a common fluctuator text January 2019
Optimal probes and error-correction schemes in multi-parameter quantum metrology text January 2019
Optimal approximate quantum error correction for quantum metrology text January 2019
Decoherence-Free Rotational Degrees of Freedom for Quantum Applications text January 2020
Fluctuation-enhanced quantum metrology preprint January 2020
Ancilla-assisted frequency estimation under phase covariant noises with Greenberger-Horne-Zeilinger states text January 2020
Quantum Plasmonic Sensors text January 2020

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