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arXiv:quant-ph/0701197 · Communications in Theoretical Physics

Scheme for Remote Implementation of Partially Unknown Quantum Operation of Two Qubits in Cavity QED

Qiu Liang, Wang An-Min

Published Nov 1, 2008• 12 citations
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Abstract

By constructing the recovery operations of the protocol of remote implementation of partially unknown quantum operation of two qubits [An-Min Wang: Phys. Rev. A 74 (2006) 032317] with two-qubit Cnot gate and single qubit logic gates, we present a scheme to implement it in cavity QED. Long-lived Rydberg atoms are used as qubits, and the interaction between the atoms and the field of cavity is a nonresonant one. Finally, we analyze the experimental feasibility of this scheme.

DOI
10.1088/0253-6102/50/5/44

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Proposes a new scheme,which is based on the non-resonance interaction between the Ξ-type three-level atom and the coherent state cavity field,to implement remote controlled-not gate of the coherent cavity field and entanglement swapping without Bell-state measure via the CNOT gate of atom and cavity.In this process,since the cavity field does not exchange energy with the atoms,thus the decoherence due to the decay of the cavity can be effectively suppressed.So the protocol is experimentally feasible based on the current cavity QED technique.
We present a simple protocol and quantum circuit for efficient implementation of the N-bit discrete quantum Fourier transform by using two-qubit controlled-NOT gate and SWCZ gate that is a combination of -SWAP and controlled-Z gates in cavity quantum electrodynamics. In this protocol long-lived electronic states in circular Rydberg atoms are used as quantum bits and the one-bit and two-bit quantum gate operations required for implementing the discrete quantum Fourier transform in the quantum circuit can be easily achieved with atom–microwave resonant interaction and atom–cavity interaction occurring only between two nearest-neighbour atoms. We present the detailed experimental procedure and analyse the experimental feasibility.