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理论物理通讯：英文版

Generation of W States with Many Superconducting-Quantum-Interference-Devices in Cavity QED

Zhi Zhan

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

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.

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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.
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 create cluster states with superconducting quantum-interference devices (SQUIDs) with the help of an auxiliary qubit, by using a quantized cavity field and classical microwave pulses, via Raman transition. In our scheme, no transfer of quantum information between the SQUIDs and the cavity is required. The cavity is only virtually excited during the whole operation and thus the cavity decay is suppressed during the operations and the requirement on the quality factor of the cavity is much relaxed, which could greatly reduce the experimental challenge.
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.