Relative Phase States in Quantum-Atom Optics

TL;DR

This paper develops a quantum phase operator for two-mode systems in atom optics, introduces relative phase eigenstates with unique entanglement and squeezing properties, and explores their application in Heisenberg-limited interferometry with Bose-Einstein condensates.

Contribution

It defines a Hermitian relative phase operator using Pegg-Barnett formalism and applies it to BEC interferometry, proposing a method to prepare such states.

Findings

Relative phase eigenstates exhibit maximal entanglement.

These states are highly spin squeezed and inside the Bloch sphere.

Potential for Heisenberg-limited interferometry using prepared states.

Abstract

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.