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arXiv:1309.3020 · Laser Physics Letters

High-efficiency single-photon Fock state production by transitionless quantum driving

Xuan Shi, L. F. Wei

Published Dec 11, 2014• 16 citations
arXivHTMLPDF

Abstract

A single-photon source is one of the key devices for optical quantum information processing. Differing from the usual stimulated Raman adiabatic passage to obtain single-photon radiation, here we propose an approach to produce an optical Fock state on demand in the usual atom–cavity system by utilizing the technique of transitionless quantum driving. The present proposal effectively suppresses the unwanted but practically unavoidable nonadiabatic transitions in the previous adiabatic schemes. Therefore, the efficiency of Fock state production by the present technique could be significantly high, even in the presence of various atomic and cavity dissipations.

DOI
10.1088/1612-2011/12/1/015204

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A single-photon source is one of the key devices for optical quantum information processing. Differing from the usual stimulated Raman adiabatic passage to obtain single-photon radiation, here we propose an approach to produce an optical Fock state on demand in the usual atom–cavity system by utilizing the technique of transitionless quantum driving. The present proposal effectively suppresses the unwanted but practically unavoidable nonadiabatic transitions in the previous adiabatic schemes. Therefore, the efficiency of Fock state production by the present technique could be significantly high, even in the presence of various atomic and cavity dissipations.
Single photon source is one of the key devices for optical quantum information processings. Differing from the usual method to obtain single-photon radiations by using the spontaneous emissions of \pi-pulse excited atoms, here we propose an approach to produce optical Fock states on demand in the usual atom-cavity system by utilizing the technique of shortcuts to adiabatic passages.It is shown that, by applying auxiliary pulse(s) (besides the usual pumps to excite atom in the cavity), the desirable transitionless quantum drivings for Fock state productions (FSPs) could be implemented deterministically.Compared with the previous method based on stimulated Raman adiabatic passages for the FSPs [see, e.g., A. S. Parkins et. al., Phys. Rev. Lett. 71, 3095 (1993) for theoretical proposal; and A. Kuhn et. al., Phys. Rev. Lett. 89, 067901 (2002) for experimental demonstrations], the present proposal suppress effectively the unwanted but practically unavoidable nonadiabatic transitions in the previous schemes during the drivings. Therefore, the efficiency of FSPs by the present technique should be significantly high, even in the presence of various atomic and cavity dissipations.
A sequence of single photons is emitted on demand from a single three-level atom strongly coupled to a high-finesse optical cavity. The photons are generated by an adiabatically driven stimulated Raman transition between two atomic ground states, with the vacuum field of the cavity stimulating one branch of the transition, and laser pulses deterministically driving the other branch. This process is unitary and therefore intrinsically reversible, which is essential for quantum communication and networking, and the photons should be appropriate for all-optical quantum information processing.
A single rubidium atom trapped within a high-finesse optical cavity is an efficient source of single photons. We theoretically and experimentally study single-photon generation using a vacuum stimulated Raman adiabatic passage. We experimentally achieve photon generation efficiencies of up to 34% and 56% on the D1{D}_{1}D1​ and D2{D}_{2}D2​ line, respectively. Output coupling with 89% results in record-high efficiencies for single photons in one spatiotemporally well-defined propagating mode. We demonstrate that the observed generation efficiencies are constant in a wide range of applied pump laser powers and virtual level detunings. This allows for independent control over the frequency and wave packet envelope of the photons without loss in efficiency. In combination with the long trapping time of the atom in the cavity, our system constitutes a significant advancement toward an on-demand, highly efficient single-photon source for quantum information processing tasks.
We propose a potentially practical scheme for generating the controllable photonic Fock state in a cavity by using the bichromatic adiabatic passage technique in the atom–cavity–laser system under dissipative environment. By numerically simulating the quantum dynamics of the whole system, we demonstrate quantitatively that the maximal probabilities of the Fock state can be achieved by elaborately adjusting the peak amplitudes of the laser’s Rabi frequency and the detuning between the laser frequency and the atomic transition frequency. In addition, we have also shown that the atomic and cavity dissipations play different roles in the preparation of the Fock state inside the cavity. The experimental feasibility and challenge are justified using currently available technology.
Motivated by "transitionless quantum driving", we construct shortcuts to adiabatic passage in a three-atom system to create a singlet state with the help of quantum zeno dynamics and non-resonant lasers. The influence of various decoherence processes is discussed by numerical simulation and the results reveal that the scheme is fast and robust against decoherence and operational imperfection. We also investigate how to select the experimental parameters to control the cavity dissipation and atomic spontaneous emission which will have an application value in experiment.
We investigate the efficiency of atom-cavity based photon-generation schemes to deliver single photons of arbitrary temporal shape. Our model applies to Raman transitions in three-level atoms with one branch of the transition driven by a laser pulse, and the other coupled to a cavity mode. For any possible shape of the single-photon wavepacket, we derive an unambiguous analytic expression for the shape of the required driving laser pulse. We furthermore discuss the constraints limiting the maximum probability for emitting any desired photon, and use these to estimate upper bounds for the efficiency of the process. The model is not only valid for Vacuum-Stimulated Raman Adiabatic Passages (V-STIRAP) in the strong-coupling and bad-cavity regime, but it generally allows controlling the coherence and population flow in any Raman process.