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21.
We present a scheme for entangling two micromechanical oscillators. The scheme exploits the quantum effects of radiation pressure and it is based on a novel application of entanglement swapping, where standard optical measurements are used to generate purely mechanical entanglement. The scheme is presented by first solving the general problem of entanglement swapping between arbitrary bipartite Gaussian states, for which simple input-output formulas are provided. 相似文献
22.
Polarization qubit phase gate in driven atomic media 总被引:1,自引:0,他引:1
We present here an all-optical scheme for the experimental realization of a quantum phase gate. It is based on the polarization degree of freedom of two traveling single-photon wave packets and exploits giant Kerr nonlinearities that can be attained in coherently driven ultracold atomic media. 相似文献
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It is shown that the Deutsch algorithm can be implemented using high-Q cavities in which the qubits are represented by single cavity modes restricted in the space spanned by the two lowest Fock states. 相似文献
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A relation between the photon-number-tomography formalism and the formalism of q-oscillators is established. The parameterq is interpreted as the parameter determining the ordered quasidistribution function. The density matrix in terms of a “marginal
distribution” used in photon-number tomography is shown to be expressed in terms of a q-commutator defining the properties
of q-oscillators. 相似文献
25.
S. Rebić D. Vitali C. Ottaviani P. Tombesi M. Artoni F. Cataliotti R. Corbalan 《Optics and Spectroscopy》2005,99(2):264-269
We present the quantum theory of a polarization phase gate that can be realized in a sample of ultracold rubidium atoms driven into a tripod configuration. The main advantages of this scheme are its relative simplicity and inherent symmetry. It is shown that conditional phase shifts of order π can be attained. 相似文献
26.
Vitali D Gigan S Ferreira A Böhm HR Tombesi P Guerreiro A Vedral V Zeilinger A Aspelmeyer M 《Physical review letters》2007,98(3):030405
We show how stationary entanglement between an optical cavity field mode and a macroscopic vibrating mirror can be generated by means of radiation pressure. We also show how the generated optomechanical entanglement can be quantified, and we suggest an experimental readout scheme to fully characterize the entangled state. Surprisingly, such optomechanical entanglement is shown to persist for environment temperatures above 20 K using state-of-the-art experimental parameters. 相似文献
27.
An asymmetric preparation of the quantum states sent through a noisy channel can enable a new way to monitor and actively compensate the channel noise. The paradigm of such an asymmetric treatment of quantum information is the Bennett 1992 protocol, in which the counts in the two separate bases are in direct connection with the channel noise. Using this protocol as a guiding example, we show how to correct the phase drift of a communication channel without using reference pulses, interruptions of the quantum transmission, or public data exchanges. 相似文献
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A quantum computer can be implemented by trapping electrons in vacuum within an innovative confining structure. Universal processing is realized by controlling the Coulomb interaction and applying electromagnetic pulses. This system offers scalability, high clock speed, and low decoherence. 相似文献