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Universal quantum logic gates in decoherence-free subspace with atoms trapped in distant cavities

Shi‐Biao Zheng

Science China Physics Mechanics and AstronomyJul 19, 20129 citations

Double controlled quantum phase gate based on three atoms trapped in separate optical cavities

Amor Gueddana, Vasudevan Lakshminarayanan

Quantum Information ProcessingJun 1, 20221 citation

Implementation of a remote three-qubit controlled-Z gate for atoms separately trapped in cavities coupled by optical fibres

Yan‐Ling Li, Mao-Fa Fang, Xing Mao Xiao +1 more

We propose a scheme for implementing a remote three-qubit controlled-Z gate with three atoms separately trapped in three distant cavities coupled by optical fibres. The influences of various decoherence processes, such as spontaneous emission of the atoms and photon leakage of the cavities and the optical fibres, on the fidelity are also investigated. It is found that the gate can be implemented with high fidelity even when these decoherence processes are considered. This scheme can be extended to the implementation of a remote N -qubit controlled-Z gate with N atoms separately trapped in N distant cavities coupled by optical fibres.We propose a scheme for implementing a remote three-qubit controlled-Z gate with three atoms separately trapped in three distant cavities coupled by optical fibres. The influences of various decoherence processes, such as spontaneous emission of the atoms and photon leakage of the cavities and the optical fibres, on the fidelity are also investigated. It is found that the gate can be implemented with high fidelity even when these decoherence processes are considered. This scheme can be extended to the implementation of a remote N -qubit controlled-Z gate with N atoms separately trapped in N distant cavities coupled by optical fibres.

Journal of Physics B Atomic Molecular and Optical PhysicsAug 4, 20107 citations

Virtual-photon-induced quantum phase gates for two distant atoms trapped in separate cavities

Shi-Biao Zheng

We propose a scheme for implementing quantum gates for two atoms trapped in distant cavities connected by an optical fiber. The effective long-distance coupling between the two distributed qubits is achieved without excitation and transportation of photons through the optical fiber. Since the cavity modes and fiber mode are never populated and the atoms undergo no transitions, the gate operation is insensitive to the decoherence effect when the thermal photons in the environment are negligible. The scheme opens promising perspectives for networking quantum information processors and implementing distributed and scalable quantum computation.We propose a scheme for implementing quantum gates for two atoms trapped in distant cavities connected by an optical fiber. The effective long-distance coupling between the two distributed qubits is achieved without excitation and transportation of photons through the optical fiber. Since the cavity modes and fiber mode are never populated and the atoms undergo no transitions, the gate operation is insensitive to the decoherence effect when the thermal photons in the environment are negligible. The scheme opens promising perspectives for networking quantum information processors and implementing distributed and scalable quantum computation.

arXiv:1203.0355Applied Physics LettersApr 13, 200985 citations

Performance of quantum phase gates with cold trapped atoms

Antonio Negretti, Tommaso Calarco, M. A. Cirone +1 more

arXiv:quant-ph/0312066The European Physical Journal DJan 1, 200510 citations

Implementing a high-efficiency quantum-controlled phase gate between long-distance atoms

Xiu‐Min Lin, Zheng-Wei Zhou, Ming-Yong Ye +2 more

We propose a scheme for the implementation of the quantum-controlled phase gate between distant atoms. Two special lasers adiabatically drive an atom trapped in a cavity that unidirectionally couples to the other cavity trapping an atom; then the phase gate between the two atoms is realized by introduction of measurement and local operations. The numerical simulations show that the quality factor of the gate operation is close to unity even if the atomic spontaneous emission is taken into account; the success probability approaches unity in principle.We propose a scheme for the implementation of the quantum-controlled phase gate between distant atoms. Two special lasers adiabatically drive an atom trapped in a cavity that unidirectionally couples to the other cavity trapping an atom; then the phase gate between the two atoms is realized by introduction of measurement and local operations. The numerical simulations show that the quality factor of the gate operation is close to unity even if the atomic spontaneous emission is taken into account; the success probability approaches unity in principle.

Journal of the Optical Society of America BJul 1, 20055 citations

Universal Controlled-Phase Gates Between Distant Atoms Separately Trapped in Thermal Cavities

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