Journal
PHYSICAL REVIEW A
Volume 100, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.100.042304
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Funding
- ARL CDQI
- AFOSR
- ARO MURI
- ARO
- NSF PFC at JQI
- DoE ASCR Quantum Testbed Pathfinder program [DE-SC0019040]
- DoE BES QIS program [DE-SC0019449]
- ARCS Foundation
- NSF PFCQC program
- U.S. Department of Energy (DOE) [DE-SC0019449] Funding Source: U.S. Department of Energy (DOE)
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We generalize past work on quantum sensor networks to show that, for d input parameters, entanglement can yield a factor O(d) improvement in mean-squared error when estimating an analytic function of these parameters. We show that the protocol is optimal for qubit sensors, and we conjecture an optimal protocol for photons passing through interferometers. Our protocol is also applicable to continuous variable measurements, such as one quadrature of a field operator. We outline a few potential applications, including calibration of laser operations in trapped ion quantum computing.
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