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arXiv:0711.0265 · Physical Review A

Transfer and teleportation of quantum states encoded in decoherence-free subspace

Hua Wei, Zhi-Jiao Deng, Xiaolong Zhang, Mang Feng

Published Nov 6, 2007• 56 citations
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Abstract

Quantum state transfer and teleportation, with qubits encoded in internal states of atoms in cavities, among spatially separated nodes of a quantum network in a decoherence-free subspace are proposed, based on a cavity-assisted interaction with single-photon pulses. We show in detail the implementation of a logic-qubit Hadamard gate and a two-logic-qubit conditional gate, and discuss the experimental feasibility of our scheme.

DOI
10.1103/physreva.76.054304

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Quantum state transfer and teleportation, with qubits encoded in internal states of atoms in cavities, among spatially separated nodes of a quantum network in a decoherence-free subspace are proposed, based on a cavity-assisted interaction with single-photon pulses. We show in detail the implementation of a logic-qubit Hadamard gate and a two-logic-qubit conditional gate, and discuss the experimental feasibility of our scheme.
We propose a many-qubit network with cavity QED by encoding qubits in decoherence-free subspace, based on which we can implement many-logic-qubit conditional gates by means of cavity-assisted interaction with single-photon pulses. Our scheme could not only resist collective dephasing errors, but also much reduce the implementational steps compared to conventional methods doing the same job, and we can also complete communications between two arbitrary nodes. We show the details by implementing a three-logic-qubit Toffoli gate and explore the experimental feasibility and challenge based on currently achievable cavity QED technologies.
A scheme is proposed to implement quantum controlled-not(CNOT) gates with a resonant cavity and this quantum gate is used to carry out teleportation of an arbitrary single-atom superposition state.By using three level atoms,it can be realized through single-qubit operation and resonant interaction between two atoms and a resonant cavity.The interaction time between two atoms and the single-mode cavity is very short,which is important in view of decoherence.This character is one of the advantages of this scheme comparing to the scheme based on detuned cavity.
In order to suppress the influence of the environment on quantum teleportation,a scheme of quantum teleportation was presented based on decoherent-free subspace.In this scheme,a kind of disentanglement-free atomic sixbit state is taken as quantum entanglement channel,and the teleportated one logical qubit quantum information is encoded into three-bit atomic state which can avoid against influence of the environment.The properties of the quantum teleportation scheme and its experimental realization were analyzed.The result shows that the whole teleportation process is immune to amplitude-flip and phase-flip noises induced by the environment and the success probability for this scheme is 44%.
Based on a cavity-assisted interaction by single-photon pulses, we propose a scheme to implement a two-qubit Grover search in a distributed quantum network, with qubits encoded in pairs of atoms in a dephasing-free subspace (DFS), which could strongly suppress collective dephasing errors and would be helpful for enhancing the fidelity of implementation. Moreover, we show that the preparation of entangled states and transfer of quantum states can be completed in our improved scheme, which is very important for the compatibility and scalability of the quantum network.