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Chinese Physics B

Fast achievement of quantum state transfer and distributed quantum entanglement by dressed states*

Liang Tian, Lili Sun, Xiaoyu Zhu, Xue‐Ke Song, L.-L. Yan, Erjun Liang, Shi‐Lei Su, Mang Feng

Published Mar 11, 2020• 3 citations
Publisher

Abstract

We propose schemes to realize quantum state transfer and prepare quantum entanglement in coupled cavity and cavity–fiber–cavity systems, respectively, by using the dressed state method. We first give the expression of pulses shape by using dressed states and then find a group of Gaussian pulses that are easy to realize in experiment to replace the ideal pulses by curve fitting. We also study the influence of some parameters fluctuation, atomic spontaneous emission, and photon leakage on fidelity. The results show that our schemes have good robustness. Because the atoms are trapped in different cavities, it is easy to perform different operations on different atoms. The proposed schemes have the potential applications in dressed states for distributed quantum information processing tasks.

DOI
10.1088/1674-1056/ab7e9a

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We propose schemes to realize quantum state transfer and prepare quantum entanglement in coupled cavity and cavity–fiber–cavity systems, respectively, by using the dressed state method. We first give the expression of pulses shape by using dressed states and then find a group of Gaussian pulses that are easy to realize in experiment to replace the ideal pulses by curve fitting. We also study the influence of some parameters fluctuation, atomic spontaneous emission, and photon leakage on fidelity. The results show that our schemes have good robustness. Because the atoms are trapped in different cavities, it is easy to perform different operations on different atoms. The proposed schemes have the potential applications in dressed states for distributed quantum information processing tasks.
We propose a dressed-state scheme to achieve shortcuts to adiabaticity in atom-cavity quantum electrodynamics for speeding up adiabatic two-atom quantum state transfer and maximum entanglement generation. Compared with stimulated Raman adiabatic passage, the dressed-state scheme greatly shortens the operation time in a non-adiabatic way. By means of some numerical simulations, we determine the parameters which can guarantee the feasibility and efficiency both in theory and experiment. Besides, numerical simulations also show the scheme is robust against the variations in the parameters, atomic spontaneous emissions and the photon leakages from the cavity.
Abstract A scheme holding simple operations and robustness is promising for the followed experimental realization. We propose to create robust two-atom entanglement in the cavity quantum electrodynamics. Only one of the two atoms confined in two spatially separated cavities connected by a fiber needs to be operated, which makes the experimental realization easier relatively. The pulses imposed on the one atom can be shaped into Gaussian pulses, and then the robustness of the scheme against the control error is strengthened greatly. The proposed scheme may provide help for the easy, fast, and robust implementation of the distributed entanglement.
Dynamic coupling of cavities to a quantum network is of major interest to distributed quantum information processing schemes based on cavity quantum electrodynamics. This can be achieved by actively tuning a mediating atom-cavity system. In particular, we consider the dynamic coupling between two coupled cavities, each interacting with a two-level atom, realized by tuning one of the atoms. One atom-field system can be controlled to become maximally and minimally coupled with its counterpart, allowing high fidelity excitation confinement, QQQ switching, and reversible state transport. As an application, we first show that simple tuning can lead to emission of near-Gaussian single-photon pulses that is significantly different from the usual exponential decay in a passive cavity-based system. The influences of cavity loss and atomic spontaneous emission are studied in detailed numerical simulations, showing the practicality of these schemes within the reach of current experimental solid-state technology. We then show that when the technique is employed to an extended coupled-cavity scheme involving a multilevel atom, arbitrary temporal superposition of single photons can be engineered in a deterministic way.
We propose schemes to prepare n-atom Greenberger–Horne–Zeilinger (GHZ) state via two-sided cavities interacting with single-photon pulses, and achieve quantum state transfer (QST) from one atom to another atom. Entanglement particle pair and the control of coupling between qubits are of no need in the QST process. Some practical quantum noises only decrease the success probabilities of the schemes but have no influence on the fidelity of prepared state. In addition, the success probabilities of our schemes are close to unity in the ideal case.
A simple scheme is presented to realize state transfer and entanglement with atomic ensembles in a one-dimensional fibre-coupled cavity chain. It is immune to atomic spontaneous emission, cavity decay and fibre decay by adiabatic dark state evolution. Moreover, with atomic-ensemble qubits instead of single-atom qubits, the process can be speeded up, which is important in view of decoherence. The most interesting aspect is that it can realize state transfer, the two-node maximum entanglement state between any selected two nodes and the m -node W state among any selected m nodes, which might be very useful in selective participation in distributed quantum information processing.
A robust quantum state transfer scheme is discussed for three atoms that are trapped by separated cavities linked via optical fibers in ring-connection. It is shown that, under the effective three-atom Ising model, arbitrary quantum state can be transferred from one atom to another deterministically via an auxiliary atom with maximum unit fidelity. The only required operation for this scheme is replicating turning on/off the local laser fields applied to the atoms for two steps with time cost 2πΓ0\frac{\sqrt{2}π}{Γ_{0}}Γ0​2​π​. The scheme is insensitive to cavity leakage and atomic position due to the condition Δ≈κ≫gΔ\approx κ\gg gΔ≈κ≫g. Another advantage of this scheme is that the cooperative influence of spontaneous emission and operating time error can reduce the time cost for maximum fidelity and thus speed up the implementation of quantum state transfer.