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Physical Review A

In-reservoir coherent control of an atom-photon bound state

Dmitri S. Mogilevtsev, S. Ya. Kilin, Solange Bessa Cavalcanti, J. Miguel Hickmann

Published Oct 21, 2005• 13 citations
Publisher

Abstract

In this work we show that the atom-photon bound state (APBS) in zero-temperature structured reservoir without an external excitation is always an entangled state of two qubits. The maximal degree of achievable entanglement depends on the atomic frequency detuning from the band edge. APBS can be produced and effectively controlled by the coherent excitation of the reservoir modes with frequencies outside the gap. The proposed scheme can be used for the single-atom optical memory device.

DOI
10.1103/physreva.72.043817

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In this work we show that the atom-photon bound state (APBS) in zero-temperature structured reservoir without an external excitation is always an entangled state of two qubits. The maximal degree of achievable entanglement depends on the atomic frequency detuning from the band edge. APBS can be produced and effectively controlled by the coherent excitation of the reservoir modes with frequencies outside the gap. The proposed scheme can be used for the single-atom optical memory device.
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We demonstrate the coherent control of spontaneous emission for a three-level atom located within a photonic band-gap structure with one resonant frequency near the edge of the photonic band gap. Spontaneous emission from the three-level atom can be totally suppressed or strongly enhanced depending on the relative phase between the steady-state control laser coupling the two upper levels and the pump laser pulse used to create an excited state of the atom in the form of a coherent superposition of the two upper levels. Unlike the free-space case, the steady-state inversion of the atomic system is strongly dependent on the externally prescribed initial conditions. This nonzero steady-state population is achieved by virtue of the localization of light in the vicinity of the emitting atom. It is robust to decoherence effects provided that the Rabi frequency of the control laser field-atom interaction exceeds the rate of dephasing interactions. As a result, such a system may be relevant for a single-atom, phase-sensitive, optical memory device on the atomic scale. The protected electric dipole within the photonic band gap provides a basis for a qubit to encode information for quantum computations.
We demonstrate coherent control of spontaneous emission from a three-level atom with one resonant frequency near the edge of a photonic band gap. As a result of quantum interference and photon localization, spontaneous emission can be totally suppressed or strongly enhanced depending on the relative phase between the control and pump laser fields. The fractionalized steady state inversion of the atom depends sensitively on the initial conditions, suggesting the possibility of a phase-sensitive, optical memory device on the atomic scale.
We demonstrate the coherent control of spontaneous emission for a three-level atom located within a photonic band gap (PBG) material, with one resonant frequency near the edge of the PBG. Spontaneous emission from the three-level atom can be totally suppressed or strongly enhanced depending on the relative phase between the steady-state control laser coupling the two upper levels and the pump laser pulse used to create an excited state of the atom in the form of a coherent superposition of the two upper levels. Unlike the free-space case, the steady-state inversion of the atomic system is strongly dependent on the externally prescribed initial conditions. This non-zero steady-state population is achieved by virtue of the localization of light in the vicinity of the emitting atom. It is robust to decoherence effects provided that the Rabi frequency of the control laser field exceeds the rate of dephasing interactions. As a result, such a system may be relevant for a single-atom, phase-sensitive optical memory device on the atomic scale. The protected electric dipole within the PBG provides a basis for a qubit to encode information for quantum computations. A detailed literature survey on the nature, fabrication and applications of PBG materials is presented to provide context for this research.