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1.
A. I. Trubilko 《JETP Letters》2012,95(1):44-50
Collective operators corresponding to two different algebras have been introduced for a simple system consisting of a single
two-level atom and a high-quality cavity mode. The generators of the first algebra satisfy boson commutation relations, whereas
the generators of the second algebra have been obtained by polynomial deformation of su(2) algebra. It has been shown that
dual squeezed states identified using the considered commutation relations can be observed in the system placed in an entangled
bath with quantum correlations. 相似文献
2.
3.
A. M. Basharov 《Optics and Spectroscopy》2010,109(1):40-47
The spontaneous emission from an atomic ensemble localized in a microcavity with the participation of microcavity photons
and an external broadband quantized electromagnetic field at the Raman resonance of photons with an optically forbidden (two-photon)
atomic transition has been studied. The average spontaneous decay intensity has been calculated for simple cases. It is shown
that the dynamics of spontaneous emission from this atomic ensemble differs generally from the conventional superradiance
(spontaneous emission of an atomic ensemble at a one-photon optically allowed transition from excited to the ground state.
When the atomic ensemble is strongly excited, the delay times and the emission pulse shape differ significantly. The parameter
ranges where the spontaneous emission from the atomic ensemble under consideration at a two-photon Raman transition can be
described as conventional superradiance with renormalized parameters are found. In the case of single excitation the photon
emission probability depends on the number of photons and atoms in the microcavity. 相似文献
4.
By virtue of the technique of integration within an ordered product (IWOP)
of operators and the properties of the inverses of annihilation and creation
operators of f-oscillator, this paper obtains two new types
of squeezed operators and
f-analogues of squeezed one-photon states, which are quite different from
ones constructed by Song and Fan
({Phys. Lett.} A {294} (2002) 66). Subsequently,
some nonclassical properties of the states are investigated in detail. 相似文献
5.
Preparation of entangled squeezed states and quantification of their entanglement 总被引:3,自引:0,他引:3
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We propose a scheme for generating bipartite and multipartite entangled squeezed states via the Jaynes-Cummings model with large detuning. Bipartite entanglement of these entangled states is quantified by the concurrence. We also use the N-tangle to compute multipartite entanglement of these multipartite entangled squeezed states. Finally we discuss two limiting cases which arise from r→∞ and r→0, in which the multipartite entangled squeezed state reduces correspondingly into an N-qubit Greenberger-Horne-Zeilinger state and an N-qubit W state. 相似文献
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7.
《Physics letters. A》1997,229(3):135-143
From a background of displaced (coherent) and squeezed states, previous (often forgotten) work on displaced and squeezed number states is reviewed. We derive the most general of such states. The time-dependent expectation values, uncertainties, wave-functions, and probability densities are obtained. We comment on the possibility of experimentally observing these states. 相似文献
8.
Recently an f-deformed Fock space which is spanned by |n〉λ was introduced. These bases are the eigenstates of a deformed non-Hermitian Hamiltonian. In this contribution, we will use rather new non-orthogonal basis vectors for the construction of coherent and squeezed states, which in special case lead to the earlier known states. For this purpose, we first generalize the previously introduced Fock space spanned by |n〉λ bases, to a new one, spanned by extended two-parameters bases |n〉λ1,λ2. These bases are now the eigenstates of a non-Hermitian Hamiltonian Hλ1,λ2=aλ1,λ2+a+(1/2), where aλ1,λ2+=a++ λ1a + λ2 and a are, respectively, the deformed creation and ordinary bosonic annihilation operators. The bases |n〉λ1,λ2 are non-orthogonal (squeezed states), but normalizable. Then, we deduce the new representations of coherent and squeezed states in our two-parameter Fock space. Finally, we discuss the quantum statistical properties, as well as the non-classical properties of the obtained states numerically. 相似文献
9.
A detailed physical characterisation of the coherent states and squeezed states of a realq-deformed oscillator is attempted. The squeezing andq-squeezing behaviours are illustrated by three different model Hamiltonians, namely i) Batemann Hamiltonian ii) harmonic oscillator
with time dependent mass and frequency and iii) a system with constant mass and time-dependent frequency. 相似文献
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11.
12.
The two-mode quantum electromagnetic field in the vacuum squeezed state is considered in the tomographic-probability representation.
The symplectic, center-of-mass, and photon-number tomograms for the two-mode vacuum squeezed state are obtained explicitly.
The expressions for photon statistics of the squeezed light are reconsidered using the state tomograms, and some new integral
relations are found for one and multimode orthogonal polynomials. 相似文献
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14.
A deformed boson algebra is naturally introduced from studying quantum mechanics on noncommutative phase space in which both positions and momenta are noncommuting each other. Based on this algebra, corresponding intrinsic noncommutative coherent and squeezed state representations are constructed, and variances of single- and two-mode quadrature operators on these states are evaluated. The result indicates that in order to maintain Heisenberg's uncertainty relations, a restriction between the noncommutative parameters is required. 相似文献
15.
We use the general formalism of squeezed rotated states to calculate baryon asymmetry in the wake of inflation through parametric amplification. We base our analysis on a B and CP violating Lagrangian in an isotropically expanding universe. The B and CP violating terms originate from the coupling of complex fields with non-zero baryon number to a complex background inflaton field. We show that a differential amplification of particle and antiparticle modes gives rise to baryon asymmetry. 相似文献
16.
《Physics letters. A》1986,119(2):51-54
The reduction of the amount of quantum noise in modulation experiments by the use of two-mode squeezed states is discussed. It is shown that by the use of squeezed radiation instead of coherent radiation, the amount of quantum noise at the modulated frequency can be reduced by many orders of magnitude. 相似文献
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18.
A definition of coherent states is proposed as the minimum uncertainty states with equal variance in two hermitian non-commuting
generators of the Lie algebra of the hamiltonian. That approach classifies the coherent states into distinct classes. The
coherent states of a harmonic oscillator, according to the proposed approach, are shown to fall in two classes. One is the
familiar class of Glauber states whereas the other is a new class. The coherent states of spin constitute only one class.
The squeezed states are similarly defined on the physical basis as the states that give better precision than the coherent
states in a process of measurement of a force coupled to the given system. The condition of squeezing based on that criterion
is derived for a system of spins. 相似文献
19.
20.
《Physics letters. A》1988,130(2):101-103
Squeezed states can be further squeezed if the initial squeezing is smaller than a certain amount. It is pointed out that one atom single-photon and two-photon micromasers could be used to produce squeezed state output, among which single-photon resonant two-photon micromaser may bring about relatively large output with deep squeezing. 相似文献