Abstract
Nonlocal implementation of a family of universal two-qubit controlled-phase gates is investigated in the regime of cavity quantum electrodynamics (CQED) system. With the driving of classical field, the atoms taken as qubits can be efficiently coupled to thermal cavities. In the course of the implementation, atomic spontaneous emission and cavity decay are negligible. With the help of quantum repeaters, our proposal can accomplish entanglement-based a family of universal controlled-phase logic gates for remote two atoms with high fidelity and success probability. Remarkably, our proposal is able to break through the limitation that error probability scales exponentially with the length of the channel. Furthermore, experimental feasibility of the scenario presented is evaluated and it turns out that it is realizable according to today’s CQED technologies. It is here emphasised that our proposal might be important to long-distance communication in prospective quantum multi-node networks.
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