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Scientific Reports

Adiabatic Generation of N-quNit Singlet States with Cavity QED

Rong‐Can Yang, Lixiang Ye, Lin Xiu, Hongyu Liu

Published Apr 3, 2017• 1 citation
Publisher

Abstract

We present a theoretical scheme to generate N-quNit singlet states with N 3 via adiabatic passage. In this protocol, the system may be robust against both experimental parameter fluctuations and dissipations along dark states. In addition, during the whole procedure, quantum information is almost fully transferred between atomic ground states. It reduces the influence of dissipations such as atomic spontaneous emissions and cavity decays. Thus, the presented proposal may be feasible based on current technologies.

DOI
10.1038/srep45756

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We present a theoretical scheme to generate N-quNit singlet states with N 3 via adiabatic passage. In this protocol, the system may be robust against both experimental parameter fluctuations and dissipations along dark states. In addition, during the whole procedure, quantum information is almost fully transferred between atomic ground states. It reduces the influence of dissipations such as atomic spontaneous emissions and cavity decays. Thus, the presented proposal may be feasible based on current technologies.
A theoretical scheme is presented for the adiabatic generation of N-quNit singlet states with N⩾3N\geqslant3N⩾3, which may be more feasible than previous ones in a cavity. In this proposal, the system may be robust both parameter fluctuations and dissipation along a dark state. In addition, quantum information is only stored in atomic ground states and there is no energy exchanged between atoms and photons in a cavity so as to reduce the influence of atomic spontaneous emission and cavity decays.
In this paper, we propose an efficient scheme to generate the N-atom singlet state via adiabatic passage of a dark state in cavity quantum electrodynamics (QED) system. Appropriate Rabi frequencies of the classical fields are selected to realize the present scheme. We discuss the influence of decoherence induced by cavity decay and atomic spontaneous emission by numerical calculation. The result shows that the scheme is insensitive to atomic spontaneous emission as the atomic excited state is hardly populated in adiabatic evolution.
We propose a relatively robust scheme to implement quantum information transfer via adiabatic passage.When a Λ-type atom interacts with laser and cavity fields adiabatically,the state of the system evolves in a dark state.By the adiabatic passage,we can implement quantum information transfer of all the atomic states.Similarly,the scheme can be used to transfer a cavity mode state.The proposal is robust to restrain the atomic spontaneous emission noise,and transfers quantum information successfully.
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In this paper, we propose an efficient scheme to drive three atoms in an optical cavity into a singlet state via adiabatic passage. Appropriate Rabi frequencies of the classical fields are selected to realize the present scheme. The scheme is robust against deviations in the pulse delay and laser intensity through some simple analysis of the adiabatic condition. It is notable that the estimated range of the effective adiabaticity condition coincides with the numerical results. When taking dissipation into account, we show that the process is immune to atomic spontaneous emission as the atomic excited states are never populated in adiabatic evolution. Moreover, under certain conditions, the cavity decay can also be efficiently suppressed.