2020/12/09 by Kevin Liang, Liang, Kevin, S. A. Wadood +3 · 1 citation
Physics and Astronomy · Computer Science · #Spectroscopy and Quantum Chemical Studies #Quantum Information and Cryptography #Mechanical and Optical Resonators
paper · pdf · doi:10.48550/arxiv.2012.05311
The quantum Fisher information (FI), when applied to the estimation of the separation of two point sources, has been shown to be non-zero in cases where the coherence between the sources are known. Although it has been claimed that ignorance of the coherence causes the quantum FI to vanish (a resurgence of Rayleigh's curse), a more complete analysis including both the magnitude and phase of the coherence parameter is given here. Partial ignorance of the coherence is shown to potentially break Rayleigh's curse, whereas complete ignorance guarantees its resurgence.