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提出了一步变换三原子W态为三原子超单态的方案。在方案中,三个五能级原子同时与双模腔发生离散相互作用。方案的优点是可以有效抵御原子自发辐射和腔衰变引起的消相干的影响。 相似文献
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Considering the spin degree of freedom of the Dirac field, we study the entanglement behavior of a different class of communication channel and teleportation of three-dimensional single particle state in noninertial frames. Numerical analysis shows that the communication channel in our scheme can offer enough distillable entanglement for the teleportation protocol. Moreover, the teleportation protocol could work well if Rob's acceleration is not very big, but the fidelity of the teleportation is still reduced due to the Unruh effect. 相似文献
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Teleportation of a two-atom entangled state using a single EPR pair in cavity QED 总被引:1,自引:0,他引:1 下载免费PDF全文
We propose a scheme for teleporting a two-atom entangled state in
cavity quantum electrodynamics (QED). In the scheme, we choose a
single Einstein--Podolsky--Rosen (EPR) pair as the quantum channel which
is shared by the sender and the receiver. By using the atom--cavity-field
interaction and introducing an additional atom, we can teleport
the two-atom entangled state successfully with a probability of 1.0.
Moreover, we show that the scheme is insensitive to cavity decay
and thermal field. 相似文献
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We propose a scheme for a fast generating three-qubit W state in a superconducting system by using a technique of shortcuts to adiabaticity, Lewis–Riesenfeld invariants. Three identical superconducting qubits(SQs) are connected by two coplanar waveguide resonators(CPWRs) capacitively. Under a certain limit condition, we convert the complicated SQ system into a simple three-state system. By designing experimentally accessible harmonic pulses, a three-SQ W state is implemented with quite short operation time and high fidelity. Numerical simulations prove that the scheme is robust against the parameter deviation. In addition, we also give detailed discussion about the scheme robustness against decoherence. 相似文献
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This paper proposes a scheme to generate a new χ-type four-atom
entangled state for the first time by using linear optics elements,
four one-sided cavities (one three-level atom) and a conventional
photon detector. The linear optical elements and conventional photon
detector are simple and accessible in experiments, which makes the
scheme more feasible with current technology. In addition, the
state |χ003214 with probability 1 can be generated
as long as there is no photon loss. 相似文献
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In this paper a quantum dialogue scheme is proposed by using N batches of single
photons. The same secret message is encoded on each batch of single photons by the
sender with two different unitary operations, and then the N batches of single
photons are sent to the receiver. After eavesdropping check, the message is encoded
on the one remaining batch by the receiver. It is shown that the
intercept-and-resend attack and coupling auxiliary modes attack can be resisted more
efficiently, because the photons are sent only once in our quantum dialogue scheme. 相似文献
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A scheme is presented tor generating steady tour-atom decoherence-tree states via tour atoms with the Raman level configuration interacting with a single-mode vacuum cavity field by using quantum-jump-based feedback. The scheme meets the condition of a strongly dissipative cavity easily and has a simplified feedback control. Although the spontaneous emission still plays a negative role in the proposed system, we can improve the feedback control to reduce its effect. 相似文献