Quantum noise thermometry for bosonic Josephson junctions in the mean field regime
arXiv:0905.2491 · doi:10.1103/PhysRevA.79.063601
Abstract
Bosonic Josephson junctions can be realized by confining ultracold gases of bosons in multi-well traps, and studied theoretically with the -site Bose-Hubbard model. We show that canonical equilibrium states of the -site Bose-Hubbard model may be approximated by mixtures of coherent states, provided the number of atoms is large and the total energy is comparable to . Using this approximation, we study thermal fluctuations in bosonic Josephson junctions in the mean field regime. Statistical estimates of the fluctuations of relative phase and number, obtained by averaging over many replicates of an experiment, can be used to estimate the temperature and the tunneling parameter, or to test whether the experimental procedure is effectively sampling from a canonical thermal equilibrium ensemble.
Accepted for Phys. Rev. A
References in corpus (14)
- Quantum Coherent Atomic Tunneling between Two Trapped Bose-Einstein Condensates
- Production of cold molecules via magnetically tunable Feshbach resonances
- Matter-wave interferometry in a double well on an atom chip
- Squeezing and entanglement in a Bose-Einstein condensate
- Atom interferometry with Bose-Einstein condensates in a double-well potential
- The Gross-Pitaevskii Equation for Bose Particles in a Double Well Potential: Two Mode Models and Beyond
- Control of Interaction-Induced Dephasing of Bloch Oscillations
- Spatial fragmentation of a Bose-Einstein condensate in a double-well potential
- Atom interferometry with a weakly-interacting Bose Einstein condensate
- Noise Thermometry with Two Weakly Coupled Bose-Einstein Condensates
- Thermal vs quantum decoherence in double well trapped Bose-Einstein condensates
- Realization of a single Josephson junction for Bose-Einstein condensates
- A Primary Noise Thermometer for Ultracold Bose Gases
- Examples of bosonic de Finetti states over finite dimensional Hilbert spaces