On the connection between quantum nonlocality and phase sensitivity of two-mode entangled Fock state superpositions.

*(English)*Zbl 1338.81075Summary: In two-mode interferometry, for a given total photon number \(N\), entangled Fock state superpositions of the form \((|N-m\rangle_a|m\rangle_b+\mathrm{e}^{i (N-2m)\phi}|m\rangle_a|N-m\rangle_b)/\sqrt{2}\) have been considered for phase estimation. Indeed all such states are maximally mode-entangled and violate a Clauser-Horne-Shimony-Holt (CHSH) inequality. However, they differ in their optimal phase estimation capabilities as given by their quantum Fisher informations. The quantum Fisher information is the largest for the \(N\)00\(N\) state \((|N\rangle_a|0\rangle_b+\mathrm{e}^{i N\phi}|0\rangle_a|N\rangle_b)/\sqrt{2}\) and decreases for the other states with decreasing photon number difference between the two modes. We ask the question whether for any particular Clauser-Horne (CH) (or CHSH) inequality, the maximal values of the CH (or the CHSH) functional for the states of the above type follow the same trend as their quantum Fisher informations, while also violating the classical bound
whenever the states are capable of sub-shot-noise phase estimation, so that the violation can be used to quantify sub-shot-noise sensitivity. We explore CH and CHSH inequalities in a homodyne setup. Our results show that the amount of violation in those nonlocality tests may not be used to quantify sub-shot-noise sensitivity of the above states.

##### MSC:

81P40 | Quantum coherence, entanglement, quantum correlations |

81P05 | General and philosophical questions in quantum theory |

81P15 | Quantum measurement theory, state operations, state preparations |

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\textit{K. P. Seshadreesan} et al., Quantum Inf. Process. 15, No. 3, 1025--1042 (2016; Zbl 1338.81075)

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