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1.
Quantum properties of nonclassical states generated by an optomechanical system with catalytic quantum scissors 下载免费PDF全文
Heng-Mei Li 《中国物理 B》2023,32(1):14202-014202
A scheme is proposed to investigate the non-classical states generated by a quantum scissors device (QSD) operating on the the cavity mode of an optomechanical system. When the catalytic QSD acts on the cavity mode of the optomechanical system, the resulting state contains only the vacuum, single-photon and two-photon states depending upon the coupling parameter of the optomechanical system as well as the transmission coefficients of beam splitters (BSs). Especially, the output state is just a class of multicomponent cat state truncations at time t=2π by choosing the appropriate value of coupling parameter. We discuss the success probability of such a state and the fidelity between the output state and input state via QSD. Then the linear entropy is used to investigate the entanglement between the two subsystems, finding that QSD operation can enhance their entanglement degree. Furthermore, we also derive the analytical expression of the Wigner function (WF) for the cavity mode via QSD and numerically analyze the WF distribution in phase space at time t=2π. These results show that the high non-classicality of output state can always be achieved by modulating the coupling parameter of the optomechanical system as well as the transmittance of BSs. 相似文献
2.
Non-Gaussianity and decoherence of generalized photon-added coherent state as a Hermite-excited coherent state 下载免费PDF全文
Generalized photon-added coherent state (GPACS) is obtained by repeatedly acting the combination of Bose creation and annihilation operations on the coherent state. It is found that GPACS can be regarded as a Hermite-excited coherent state due to its normalization factor related to a Hermite polynomial. In addition, we adopt the Hilbert-Schmidt distance to quantify the non-Gaussian character of GPACS and discuss the decoherence of GPACS in dissipative channel by studying the loss of nonclassicality in reference of the negativity of Wigner function. 相似文献
3.
We propose a simple experimental scheme in which an unknown two-qubit state
is faithfully and deterministically teleported from Alice to Bob. The scheme
is constructed with four photons from parametric down conversion, linear
optical elements, and conventional photon detectors, all of which are
available in current technology. It is shown that the probability of
successful teleportation ideally reaches 100% based on single-photon
two-qubit-assisted Bell-state measurement, which can distinguish all
four Bell-states simultaneously via conventional photon detectors. By
generalizing the scheme, the teleportation of an unknown multi-qubit system
can also be realized. 相似文献
4.
An Electromagnetic Form Factor of a Charged Scalar Meson with Schwinger-Dyson and Bethe-Salpeter Equations 下载免费PDF全文
The wave functions and electromagnetic form factor of charged scalar mesons are studied with a modified vectorvector fiat-bottom potential model under the framework of the Schwinger-Dyson and Bethe-Salpeter equations. The obtained results agree well with other theories. 相似文献
5.
New operator identities with regard to the two-variable Hermite polynomial by virtue of entangled state representation 下载免费PDF全文
By virtue of the entangled state representation we concisely derive some new operator identities with regard to the two-variable Hermite polynomial (TVHP). By them and the technique of integration within an ordered product (IWOP) of operators we further derive new generating function formulas of the TVHP. They are useful in quantum optical theoretical calculations. It is seen from this work that by combining the IWOP technique and quantum mechanical representations one can derive some new integration formulas even without really performing the integration. 相似文献
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The light vector mesons are studied within the framework of the Beth-Salpeter equation with the vector vectortype flat-bottom potential. The Bethe-Salpeter wavefunetions and the decay constants of the vector mesons are obtained. All the obtained results, fp, f φ, and fK*, are in agreement with the experimental values, respectively. 相似文献
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9.
Quantum metrology with two-mode squeezed thermal state: Parity detection and phase sensitivity 下载免费PDF全文
Based on the Wigner-function method, we investigate the parity detection and phase sensitivity in a Mach–Zehnder interferometer(MZI) with two-mode squeezed thermal state(TMSTS). Using the classical transformation relation of the MZI, we derive the input–output Wigner functions and then obtain the explicit expressions of parity and phase sensitivity.The results from the numerical calculation show that supersensitivity can be reached only if the input TMSTS have a large number photons. 相似文献
10.
在导出(f(X)+g(P))k正规乘积形式的基础上,利用未归一化的相干态与谐振子的本征态之间的关系计算出的通式,并对所得的结果进行了讨论.本文所用方法显得清晰易懂、推导简捷明快. 相似文献