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Chinese Journal of Quantum Electronics

Scheme for implementation of controlled-not gate and quantum teleportation in a resonant cavity

Shi Shi-wei, You-Min Yi

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

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.

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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.
A scheme is presented for realizing two-atom quantum logic gates with a single resonant interaction. The scheme does not use the cavity mode as the data bus and only requires a single resonant interaction of the atoms with a cavity mode. Thus the scheme is very simple and the interaction time is very short, which is important in view of decoherence. Quantum information can be directly transferred from one atom to another atom using this idea. The scheme can also be generalized to the ion trap system.
We propose a scheme for realizing quantum three-qubit phase gate operation, in a three-mode cavity where the large detuned cavity-mode fields interact with the four-level artificial atom of an rf-SQUID in tripod-type configuration. In this scheme, the two lowest levels of the artificial atom represent the two logical states of the target qubit and two cavity-mode states are the control qubits, while the third cavity-mode field serves the gate manipulation. Since only the metastable lower levels are involved in the gate operations, the gate is insensitive to the decay rates of the artificial atom, which makes this scheme advantageous and it is important in view of decoherence.