Quantum information approach to Bose-Einstein condensation of composite bosons
arXiv:1409.6479 · doi:10.1088/1367-2630/17/11/113015
Abstract
We consider composite bosons (cobosons) comprised of two elementary particles, fermions or bosons, in an entangled state. First, we show that the effective number of cobosons implies the level of correlation between the two constituent particles. For the maximum level of correlation, the effective number of cobosons is the same as the total number of cobosons, which can exhibit the original Bose-Einstein condensation (BEC). In this context, we study a model of BEC for indistinguishable cobosons with a controllable parameter, i.e., entanglement between the two constituent particles. We find that bi-fermions behave in a predictable way, i.e., the effective number of the ground state coboson is an increasing function of entanglement between a pair of constituent fermions. Interestingly, bi-bosons exhibit the opposite behaviour - the effective number of the ground state coboson is a decreasing function of entanglement between a pair of constituent bosons.
10 pages, 5 figures, accepted for publication in New J. Phys
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- Statistical signatures of states orthogonal to the Fock-state ladder of composite bosons
- Assembly of 2N entangled fermions into multipartite composite bosons
- On dynamical stability of composite quantum particles: when entanglement is enough and when interaction is needed
- Nonlocal bunching of composite bosons
- Two-particle indistinguishability and identification of boson-and-fermion species: a Fisher information approach