منابع مشابه
Squeezed Vacuum Interferometry
A high-sensitive interferometric scheme is presented. It is based on homodyne detection and squeezed vacuum phase properties. The resulting phase sensitivity scales as ' 1 4 n 1 with respect to input photons number. Accepted for publication in Modern Phyiscs Letters B E-mail Address: [email protected]
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Employing the quantum Hamiltonian describing the interaction of two-mode light (signalidler modes) generated by a nondegenerate parametric oscillator (NDPO) with two uncorrelated squeezed vacuum reservoirs (USVR), we derive the master equation. The corresponding Fokker-Planck equation for the Q-function is then solved employing a propagator method developed by K. Fesseha [J. Math. Phys. 33 2179...
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We consider the problem of estimating the phase of squeezed vacuum states within a Bayesian framework. We derive bounds on the average Holevo variance for an arbitrary number N of uncorrelated copies. We find that it scales with the mean photon number n, as dictated by the Heisenberg limit, i.e., as n−2, only for N 4. For N 4 this fundamental scaling breaks down and it becomes n−N/2. Thus, a si...
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We discuss the treatment of squeezed states as excitations in the Euclidean vacuum of de Sitter space. A comparison with the treatment of these states as candidate noparticle states, or alpha-vacua, shows important differences already in the free theory. At the interacting level alpha-vacua are inconsistent, but squeezed state excitations seem perfectly acceptable. Indeed, matrix elements can b...
متن کاملQuantum teleportation with squeezed vacuum states
We show how the partial entanglement inherent in a two-mode squeezed vacuum state admits two different teleportation protocols. These two protocols refer to the different kinds of joint measurements that may be made by the sender. One protocol is the recently implemented quadrature phase approach of Braunstein and Kimble @Phys. Rev. Lett. 80, 869 ~1998!#. The other is based on recognizing that ...
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ژورنال
عنوان ژورنال: Modern Physics Letters B
سال: 1995
ISSN: 0217-9849,1793-6640
DOI: 10.1142/s0217984995001133