Coherent Control of Atomic q-bits by Non-classical Light and Phase Measurements

Stepan N. Balybin, Polina R. Sharapova, Olga V. Tikhonova

Stepan N. Balybin, Olga V. Tikhonova

Zhou Yuan

Considering two-mode entangled coherent light fields,one mode of the fields was poured into the cavity with a two-level atom and interacted with it by k photons non-resonantly.During the course of cavity-QED evolution of the total system,a selective measurement of the atom was carried out.Through manipulating the evolution time and the parameter of the coherent field which interacted with atom,in certain conditions,the non-classical light such as anti-bunching and squeezing state can be generated,and the strength of non-classical property can be changed.In this way by using the technique for cavity-QED with k photons non-resonantly and the entangled correlation between the coherent light fields,control or change the non-classical properties of coherent light fields remotely without direct measurement was implemented effectively.

Thiago Prudêncio

Generation of Aharonov-Bohm (AB) phase has achieved a state-of-the-art in mesoscopic systems with manipulation and control of the AB effect. The possibility of transfer information enconded in such systems to light increases the possible scenarios where the information can be manipulated and transfered. In this paper we discuss a bit-enconding of AB phases and propose a quantum transfer of the AB phase generated in a topological spin transistor (TST) to coherent state superposition in high-Q cavity. We demonstrate that the AB phase generated in the TST can be stored in a non-classical state of light, a coherent state superposition, by interacting dispersivelly the spin state carrying the AB phase with the cavity state initially in a coherent state. We also discuss the storage of bits enconded by AB phases in high-Q and multimode cavities.

A. A. Vishenskii, I. A. Deriugin, Vitaliy N. Kurashov

Axel André