Photon-induced self-trapping and entanglement of a bosonic Josephson junction inside an optical resonator

Year: 2015

Authors: Rosson P., Mazzarella G., Szirmai G., Salasnich L.

Autors Affiliation: Univ Padua, Dipartimento Fis & Astron Galileo Galilei, I-35131 Padua, Italy.; Univ Padua, CNISM, I-35131 Padua, Italy; Hungarian Acad Sci, Wigner Res Ctr Phys, Inst Solid State Phys & Opt, H-1525 Budapest, Hungary; CNR, INO, I-50019 Sesto Fiorentino, Italy.

Abstract: We study the influence of photons on the dynamics and the ground state of the atoms in a bosonic Josephson junction inside an optical resonator. The system is engineered in such a way that the atomic tunneling can be tuned by changing the number of photons in the cavity. In this setup the cavity photons are a means of control, which can be utilized both in inducing self-trapping solutions and in driving the crossover of the ground state from an atomic coherent state to a Schrodinger cat state. This is achieved, for suitable setup configurations, with interatomic interactions weaker than those required in the absence of a cavity. This is corroborated by the study of the entanglement entropy. In the presence of a laser, this quantum indicator attains its maximum value (which marks the formation of the catlike state and, at a semiclassical level, the onset of self-trapping) for attractions smaller than those of the bare junction

Journal/Review: PHYSICAL REVIEW A

Volume: 92 (6)      Pages from: 063604-1  to: 063604-6

KeyWords: MACROSCOPIC SUPERPOSITION STATES; DOUBLE-WELL; CAVITY; ATOMS
DOI: 10.1103/PhysRevA.92.063604

Citations: 2
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