Quantum cloning in coupled states of an optical field and an atomic ensemble by means of quasi-condensation of polaritons

Abstract

We consider a new approach for storing quantum information by macroscopic atomic excitations of two level atomic system. We offer the original scheme of quantum cloning of optical field into the cavity polaritons containing the phase insensitive parametrical amplifier and atomic cell placed in the cavity. The high temperature quasi-condensation (and/or condensation) phenomenon for polaritons arising in the cavity under the certain conditions is proposed for the first time.

High-temperature phase transition in the coupled atom-light system in the presence of optical collisions

“…[18]) or explore annihilation (a j , b j ) and creation (a † j , b † j ) operators for bosonic atoms at the ground |a and excited |b states in the second quantization representation respectively. The latter one enables definitions S −,j = a † j b j and S z,j = b † j b j − a † j a jsee [28].…”

Josephson dynamics for coupled polariton modes under the atom–field interaction in the cavity

“…In the paper we impose a strong coupling regime for which the cavity modes are coherently coupled with collective atomic exitations that can be introduced with the help of annihilation (φ) and creation (φ † ) operators as (cf. [18]):…”

“…In fact, in our case a macroscopic quantum self-trapping behavior of polaritonic modes takes place, first, as a result of nonlinear interaction of macroscopically large number of polaritons from different branches. Second, the MQST regime occurs as a result of the "external force" action (see (18), ( 23)) depending on effective difference ∆E eff = 0 in (13).…”

“…For some practical purposes the coherent properties of upper branch of polaritons can be important as well. In fact, the problem of formation of quantum entangled polariton states from different branches [17] is the case in respect to construct the algorithms of quantum cloning and storage for optical field into the cavity polaritons being recently proposed [18]. However, in the experiment [14] the upper polariton branch has not been developed in the photoluminescence when the quasi-condensation of lower polariton branch takes place under the thermal equilibrium condition.…”

Qubits Based on Polariton Rabi Oscillators

“…Recently, various approaches have been proposed for classical and quantum computation with the use of microcavity polaritons, see, e.g., [5][6][7][8][9]. It has been proposed in [5] and then demonstrated in [6] that the classical information can be carried by lower branch polaritons (LP) propagating in microcavity based optical integrated circuits.…”