Detection of coherent superpositions of phase states by full counting statistics in a Bose Josephson junction

Abstract

For a Bose Josephson junction realized with a double-well potential we propose a strategy to observe the coherent superpositions of phase states occurring during the time evolution after a sudden rise of the barrier separating the two wells. We show that their phase content can be obtained by the full-counting statistics of the spin-boson operators characterizing the junction, which could be mapped out by repeated measurements of the population imbalance after rotation of the state. This measurement can distinguish between coherent superpositions and incoherent mixtures, and can be used for a two-dimensional, tomographic reconstruction of the phase content of the state.

5 pages, 3 figures

References in corpus (6)

• Direct Observation of Tunneling and Nonlinear Self-Trapping in a single Bosonic Josephson Junction
• Reconstruction of non-classical cavity field states with snapshots of their decoherence
• Optical Weak Link between Two Spatially Separate Bose-Einstein Condensates
• Number squeezing, quantum fluctuations and oscillations in mesoscopic Bose Josephson junctions
• Optimized Double-well quantum interferometry with Gaussian squeezed-states
• Macroscopic Superpositions of Phase States with Bose-Einstein Condensates

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• Effect of phase noise on useful quantum correlations in Bose Josephson junctions
• Quantum phase estimation using a multi-headed cat state
• Nonadiabatic creation of macroscopic superpositions with strongly correlated 1D bosons on a ring trap
• Quantum Bose Josephson Junction with binary mixtures of BECs
• Equation of motion method for Full Counting Statistics: Steady state superradiance
• Global and local condensate and superfluid fraction of a few hard core bosons in a cubic optical lattice plus external harmonic confinement
• Mesoscopic electron transport and atomic gases, a review of Frank W. J. Hekking's scientific work
• Multipartite entangled states in dipolar quantum simulators