Engineering CNOT gate in cavity QED scenario

M. Hammani, A. Chouikh, Taoufik Said +1 more

Sergey N. Andrianov, Арсланов Наркис Мусавирович, K. I. Gerasimov +2 more

Nicolas Sangouard, X. Lacour, S. Guérin +1 more

Zheng Shi-cai

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.

Taoufik Said, A. Chouikh, K. Essammouni +1 more

We propose an effective way for realizing a three quantum logic gates (NTCP gate, NTCP-NOT gate and NTQ-NOT gate) of one qubit simultaneously controlling N target qubits based on the qubit-qubit interaction. We use the superconducting qubits in a cavity QED driven by a strong microwave field. In our scheme, the operation time of these gates is independent of the number N of qubits involved in the gate operation. These gates are insensitive to the initial state of the cavity QED and can be used to produce an analogous CNOT gate simultaneously acting on N qubits. The quantum phase gate can be realized in a time (nanosecond-scale) much smaller than decoherence time and dephasing time (microsecond-scale) in cavity QED. Numerical simulation under the influence of the gate operations shows that the scheme could be achieved efficiently within current state-of-the-art technology.

Qiu Liang, Wang An-Min

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.