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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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用微波消解-火焰原子吸收光谱法测定了康定鼠尾草药材中8种元素(钙、铜、铁、锰、锌、镁、铅、镉)的含量。结果表明,康定鼠尾草药材中含有较丰富的镁、钙、铁,该法灵敏度高、快速、准确,所测数据可为康定鼠尾草药材的合理利用提供可靠依据。 相似文献
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We investigate the properties of the ponderomotive squeezing in an optomechanical system coupled to a charged nanomechanical oscillator(NMO) nearby via Coulomb force. We find that the introduction of Coulomb interaction allows the generation of squeezed output light from this system. Our numerical results show that the degree of squeezing can be tuned by the Coulomb coupling strength, the power of laser, and the frequencies of NMOs. Furthermore, the squeezing generated in our approach can be used to measure the Coulomb coupling strength. 相似文献
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We propose optical implementation for the quantum clock synchronization （QCS） algorithm by using only linear optical elements. Our method is based on the single photon representation of qubits. Two kinds of linear optical realization schemes, i.e,, the location-plus-polarization-qubit scheme and the all-location-qubit scheme, are proposed, respectively. Linear optical realizations of three-qubit and four-qubit QCS algorithm are explicitly presented. 相似文献
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A system consisting of two atoms interacting with atwo-mode vacuum is considered, where each atom is resonant with thetwo cavity modes through two different competing transitions. Theeffect of mode--mode competition on the atom--atom entanglement isinvestigated. We find that the entanglement between the two atomscan be induced by the mode--mode competition. For the initial atomicstate |varPsi(0)rangle, whether the atoms are initiallyseparated or entangled, a large or even maximal entanglement betweenthem can be obtained periodically by introducing the mode--modecompetition. For the initial atomic state |varPhi(0)rangle, thestrong mode--mode competition can prevent the two atoms entangledinitially from suffering entanglement sudden death; besides, itmakes them in a more stable and longer-lived entanglement than inthe non-competition case. 相似文献
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We investigate properties of the ponderomotive squeezing in an optomechanical system with two coupled resonators,where the tunable two-mode squeezing spectrum can be observed from the output field.It is realized that the squeezing orientation can be controlled by the detuning between the left cavity and pump laser.Especially,both cavity decay and environment temperature play a positive role in generating better pondermotive squeezing light.Strong squeezing spectra with a wide squeezing frequency range can be obtained by appropriate choice of parameters present in our optomechanical system. 相似文献
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Considering two identical two-level atoms interactingwith a single-mode thermalfield through two-photon processes,this paper studies the atomic coherence control on theentanglement between two two-level atoms,and finds that the entanglement is greatlyenhanced due to the initial atomic coherence. The results showthat the entanglement can be manipulatedby changing the initialparameters of the system, such as the superposition coefficientsand the relative phasesof the initial atomic coherent state and the mean photonnumber of the cavity field. 相似文献
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In this paper, the entanglement dynamics of two two-level atoms trapped in coupled cavities with a Kerr medium is investigated, We find that the phenomena of entanglement sudden death （ESD） and entanglement sudden birth （ESB） appear during the evolution process. The influences of initial atomic states, Kerr medium, and cavity-cavity hopping rate on the atom-atom entanglement are discussed. The results obtained by the numerical method show that the atom- atom entanglement is strengthened and even prevented from ESD with increasing cavity-cavity hopping rate and Kerr nonlinearity. 相似文献