2011/08/03 by B J Dalton, Dalton, B J
Physics and Astronomy · #FOS: Physical sciences #Quantum Gases (cond-mat.quant-gas) #Quantum Physics (quant-ph) #cond-mat.quant-gas #quant-ph
paper · pdf · doi:10.48550/arxiv.1108.0756
22 pages plus 11 page Appendix. 11 figures. Submitted for publication. Figures revised
arxiv created 2011/08/22 · arxiv updated 2011/08/24
Relative phase is treated as a physical quantity for two mode systems in quantum atom optics, adapting the Pegg-Barnett treatment of quantum optical phase to define a linear Hermitian relative phase operator via first introducing a complete orthonormal set of relative phase eigenstates. These states are contrasted with other so-called phase states. Other approaches to treating phase and previous attempts to find a Hermitian phase operator are discussed. The relative phase eigenstate has maximal two mode entanglement, it is a fragmented state with its Bloch vector lying inside the Bloch sphere and is highly spin squeezed. The relative phase states are applied to describing interferometry experiments with Bose-Einstein condensates (BEC), particularly in the context of a proposed Heisenberg limited interferometry experiment. For a relative phase eigenstate the fractional fluctuation in one spin operator component perpendicular to the Bloch vector is essentially only of order 1/N, so if such a highly spin squeezed state could be prepared it may be useful for Heisenberg limited interferometry. An approach for preparing a BEC in a state close to a relative phase state is suggested, based on adiabatically changing parameters in the Josephson Hamiltonian starting from a suitable energy eigenstate in the Rabi regime.