Quantum-nondemolition modulation of quantum interference
نویسندگان
چکیده
منابع مشابه
Quantum Nondemolition Monitoring of Universal Quantum Computers
It is proved that the halt scheme for a universal quantum computer originally proposed by Deutsch works without spoiling the computation. The “conflict” pointed out recently by Myers in the defintion of a universal quantum computer is shown to be only apparent. In the context of quantum nondemolition (QND) measurement, it is also shown that the output observable, an observable representing the ...
متن کاملQuantum nondemolition measurements for quantum information
T. C. Ralph,* S. D. Bartlett, J. L. O’Brien, G. J. Pryde, and H. M. Wiseman Centre for Quantum Computer Technology, University of Queensland, Brisbane, Queensland 4072, Australia Department of Physics, University of Queensland, Brisbane, Queensland 4072, Australia School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia Centre for Quantum Computer Technology, Center ...
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The time evaluation of quantum entropy in a four-level double- type atomic system is theoretically investigated. Quantum entanglement of the atom and its spontaneous emission fields is then discussed via quantum entropy. It is found that the degree of entanglement can be increased by the quantum interference induced by spontaneous emission. The phase dependence of the atom-field entanglement is...
متن کاملQuantum non-demolition (QND) modulation of quantum interference
We propose an experiment where quantum interference between two different paths is modulated by means of a QND measurement on one or both the arms of an interferometer. The QND measurement is achieved in a Kerr cell. We illustrate a scheme for the realisation of this experiment and discuss some further developments.
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A polarization preserving quantum nondemolition photodetector is proposed based on nonlinearities obtainable through quantum coherence effects. An atomic level scheme is devised such that in the presence of strong linearly polarized drive field a coherent weak probe field acquires a phase proportional to the number of photons in the signal mode immaterial of its polarization state. It is also s...
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ژورنال
عنوان ژورنال: Physical Review A
سال: 2000
ISSN: 1050-2947,1094-1622
DOI: 10.1103/physreva.61.032102