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Communications in Theoretical Physics

Generation of an Entangled State of Two Three-Level Superconducting Quantum Interference Devices in Cavity

Zhiming Zhan, Jiahua Li, Weibin Li

Published Mar 1, 2006• 0 citations
Publisher

Abstract

We propose a scheme for generating a maximally entangled state of two three-level superconducting quantum interference devices (SQUIDs) by using a quantized cavity field and classical microwave pluses in cavity. In this scheme, no quantum information will be transferred from the SQUIDs to the cavity since the cavity field is only virtually excited. Thus, the cavity decay is suppressed during the entanglement generation.

DOI
10.1088/0253-6102/45/3/033

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We propose a scheme for generating a maximally entangled state of two three-level superconducting quantum interference devices (SQUIDs) by using a quantized cavity field and classical microwave pluses in cavity. In this scheme, no quantum information will be transferred from the SQUIDs to the cavity since the cavity field is only virtually excited. Thus, the cavity decay is suppressed during the entanglement generation.
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In the system with superconducting quantum interference devices (SQUIDs) in cavity, the quantum logic gates operation and entanglement can be achieved by using a quantized cavity field and classical microwave pluses, via Raman transition. In this scheme, no transfer of quantum information between the SQUIDs and cavity is required, the cavity field is only virtually excited and thus the cavity decay is suppressed during the gate operation and entanglement generations. The gate operation and entanglement generations are realized by using only the two lower flux states of the SQUID system and the excited state would not be excited. Therefore, the effect of docoherence based on the levels of the SQUID system is possible to minimize.
We propose a scheme to generate the W states with many SQUIDs (superconducting-quantum-interference-devices) in cavity QED via Raman transition. In this scheme, the transfer of quantum information between the SQUIDs and cavity is not required. And the cavity field is only virtually excited, thus the cavity decay is suppressed during the W states generation. The SQUIDs are always populated in the two ground states. Therefore, the scheme is insensitive to the spontaneous emission of the excited level of the SQUID and cavity decay.
We propose a scheme to generate the W states with many SQUIDs (superconducting-quantum-interferencedevices) in cavity QED via Raman transition.In this scheme,the transfer of quantum information between the SQUIDs and cavity is not required.And the cavity field is only virtually excited,thus the cavity decay is suppressed during the W states generation.The SQUIDs are always populated in the two ground states.Therefore,the scheme is insensitive to the spontaneous emission of the excited level of the SQUID and cavity decay.