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We propose a scheme to implement quantum state transfer in a hybrid circuit quantum electrodynarnics (QED) system which consists of a superconducting charge qubit, a flux qubit, and a transmission line resonator (TLR). It is shown that quantum state transfer between the charge qubit and the flux qubit can be realized by using the TLR as the data bus. 相似文献
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In this paper, we study a quantum anti-Zeno effect (QAZE) purely induced by repetitive measurements for an artificial atom interacting with a structured bath. This bath can be artificially realized with coupled resonators in one dimension and possesses photonic band structure like Bloeh electron in a periodic potential. In the presence of repetitive measurements, the pure QAZE is discovered as the observable decay is not negligible even for the atomic energy level spacing outside of the energy band of the artificial bath. If there were no measurements, the decay would not happen outside of the band. In this sense, the enhanced decay is completely induced by measurements through the relaxation channels provided by the bath. Besides, we also discuss the controversial golden rule decay rates originated from the van Hove's singularities and the effects of the counter-rotating terms. 相似文献
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Controllable cross-Kerr interaction between microwave photons in circuit quantum electrodynamics 下载免费PDF全文
We propose a scheme to enable a controllable cross-Kerr interaction between microwave photons in a circuit quantum electrodynamics(QED) system.In this scheme we use two transmission-line resonators(TLRs) and one superconducting quantum interference device(SQUID) type charge qubit,which acts as an artificial atom.It is shown that in the dispersive regime of the circuit-QED system,a controllable cross-Kerr interaction can be obtained by properly preparing the initial state of the qubit,and a large cross-phase shift between two microwave fields in the two TLRs can then be reached.Based on this cross-Kerr interaction,we show how to create a macroscopic entangled state between the two TLRs. 相似文献
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We propose a nearly perfect optical scheme for the quantum teleportation of
entangled coherent states using optical devices such as nonlinear Kerr media, beam
splitters, phase shifters, and photon detectors. Different from those previous
schemes, our scheme needs only ``yes' or `no' measurements of the photon number of
the related modes, i.e. nonzero- and zero-photon measurements, while in previous
schemes one has to exactly identify the even or odd parity character of the photon
numbers detected by detectors. 相似文献
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We study the quantum discord in a two-spin-1/2 XXZ model in thermal equilibrium at temperature T in the presence of an external magnetic field B. Special attention is paid to the dependence of quantum discord on the temperature T and magnetic field B. It is found that quantum thermal discord is more robust than concurrence against temperature, in the sense that quantum thermal discord does not vanish at finite temperatures, but concurrence vanishes completely at a critical temperature. 相似文献
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混合腔光力系统同时包含一次和二次光力相互作用。本文研究了混合腔光力系统中的双光子散射问题。在Wigner-Weisskopf框架下,通过求解散射过程,获得了混合腔光力系统散射态的解析表达式,揭示了双光子散射的4个物理过程:1)双光子均被直接反射,不进入腔中;2)一个光子被直接反射,另一个光子入射进腔中;3)两个光子按次序先后入射进腔中,但腔中最多只有一个光子;4)两个光子均入射进腔中。通过分析双光子散射谱,发现在该散射过程中可以产生双光子频率反关联,并且发现了混合腔光力系统中的参数与双光子散射谱特性之间的联系。该研究不仅提供了一种产生关联光子对的散射方法,而且提出了一种表征光力系统参数的光谱方法。 相似文献
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