Quantum computation and quantum information
Quantum computation and quantum information
Efficient universal quantum circuits
Quantum Information & Computation
High-fidelity universal quantum gates through group-symmetrized rapid passage
Quantum Information & Computation
Controlled implementation of two-photon controlled phase gate within a network
Quantum Information & Computation
Polarization-entanglement purification and concentration using cross-kerr nonlinearity
Quantum Information & Computation
Quantum Information Processing
Two-party quantum privacy comparison with polarization-entangled bell states and the coherent states
Quantum Information & Computation
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On the basis of the probe coherent state and weak cross-Kerr nonlinearities, we present a scheme of a nearly deterministic Controlled-NOT gate. In this construction, feed-forward methods, quantum nondemolition detectors and several optical elements are applied. It is a potentially practical quantum gate with certain features. First, the lack of auxiliary photons is allowable, which decreases consumption of resources. Secondly, employment of the signal photon from either of target output ports and three quantum nondemolition detectors enable the success probability to approach unit and judge whether the signal photons lose or not. Thirdly, the displacement measurement is adopted, and thus the Controlled-NOT gate works against photon loss of the probe coherent state. Finally, in order to circumvent the effect of dephasing, the monochromatic signal photons are exploited.