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Chinese Journal of Quantum Electronics

One step for generation of W-class states via superconducting quantum interference devices

Tao Wu

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

Because the property of a class of W state can be used as entanglement channel for realizing perfect teleportation and dense coding with the successful probability 100%,a simple scheme is presented for generating this W-class entangled state.It relies on the superconducting quantum interference devices(SQUIDs) simultaneously interacting with single-mode cavity field under resonant circumstances.The distinct feature lies in that the whole course of preparation only needs one step.The scheme can be implemented by the present cavity QED techniques.

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Because the property of a class of W state can be used as entanglement channel for realizing perfect teleportation and dense coding with the successful probability 100%,a simple scheme is presented for generating this W-class entangled state.It relies on the superconducting quantum interference devices(SQUIDs) simultaneously interacting with single-mode cavity field under resonant circumstances.The distinct feature lies in that the whole course of preparation only needs one step.The scheme can be implemented by the present cavity QED techniques.
We propose a simple scheme for generating n-qubit W state via superconducting quantum interference devices in a single-mode cavity.Superconducting quantum interference devices interact with the cavity resonantly,and the resonant coupling strength is much stronger than other interaction strength,so the other interaction is negligible.Thus,generating n-qubit W state is achieved by only one step evolution.In the case of the decay is close to the coupling of the cavity with the superconducting quantum interference devices,we still generate n-qubit W state successfully.
An alternative scheme is proposed for the generation of n-qubit W states of superconducting quantum interference devices (SQUID) in cavity QED. In this scheme, Raman coupling of two lower flux states of SQUID system is achieved via a microwave pulse and the cavity mode. Conditioned on no photon leakage from the cavity, the n-qubit W state can be generated whether the effective coupling parameters of the SQUID to cavity mode and classical microwave fields are the same or different. Our strictly numerical simulations of the time evolution of the system including decay show that the success probability of our scheme is almost unity and the interaction time is on the order of 10 −9 s. The scheme can also be used to generate the Schrödinger cat states of multi-SQUID.
An alternative scheme is proposed for generating the Greenberg–Horne–Zeilinger (GHZ) and W types of the entangled states with multiple superconducting quantum-interference device (SQUID) qubits in a single-mode microwave cavity field. In this scheme, there is no transfer of quantum information between the SQUIDs and the cavity, the cavity is always in the vacuum and thus the requirement on the quality of cavity is greatly loosened. In addition, during the process of the generation of the W entangled state, the present method does not involve a real excitation of intermediate levels. Thus, decoherence due to energy relaxation of intermediate levels is minimized.