Quantum nondemolition measurements for quantum information
نویسندگان
چکیده
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 for Quantum Dynamics, School of Science, Griffith University, Brisbane, Queensland 4111, Australia Received 20 December 2004; published 31 January 2006; corrected 8 February 2006
منابع مشابه
Engineering QND measurements for continuous variable quantum information processing
A novel scheme to realize the whole class of quantum nondemolition (QND) measurements of a field quadrature is suggested. The setup requires linear optical components and squeezers, and allows optimal QND measurements of quadratures, which minimize the information gain versus state disturbance trade-off.
متن کاملQuantum nondemolition measurement of a light field component by a feedback compensated beam splitter
In conventional quantum nondemolition measurements, the interaction between signal and probe preserves the measured variable. Alternatively, it is possible to restore the original value of the variable by feedback. In this paper, we describe a quantum nondemolition measurement of a quadrature component of the light field using a feedback compensated beam splitter. The noise induced by the vacuu...
متن کاملQuantum nondemolition measurements of a qubit coupled to a harmonic oscillator
We theoretically describe the weak measurement of a two-level system qubit and quantify the degree to which such a qubit measurement has a quantum nondemolition QND character. The qubit is coupled to a harmonic oscillator, which undergoes a projective measurement. Information on the qubit state is extracted from the oscillator measurement outcomes, and the QND character of the measurement is in...
متن کاملQuantum nondemolition measurements on two-level atomic systems and temporal Bell inequalities
The evolution of a two-level system subjected to stimulated transitions which is undergoing a sequence of measurements of the level occupation probability is evaluated. Its time correlation function is compared to the one obtained through the pure Schrödinger evolution. Systems of this kind have been recently proposed for testing the quantum mechanical predictions against those of macrorealisti...
متن کاملQuantum nondemolition measurements of a particle in an inhomogeneous gravitational field
Dedicated to Heinz Dehnen in honour of his 65 birthday. In this work we obtain a family of quantum nondemolition variables for the case of a particle moving in an inhomogeneous gravitational field. Afterwards, we calculate the corresponding propagator, and deduce the probabilities associated with the possible measurement outputs. The comparison, with the case in which the position is being moni...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2006