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Journal of Jianghan University

Realization of Multi-qubit GHZ States in Superconducting Quantum-interference Devices via Double Raman Transition

Xing Li

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

Propose a scheme to realize multi-qubit GHZ states in superconducting quantum-interference devices(SQUIDs) via double Raman transition.In this scheme,the cavity field is only virtually excited and thus the cavity decay can be ignored.The GHZ states are realized by using only two basic states of the SQUID system and the relaxation of excited state of the system are avoided.Base on the points mentioned above,the scheme should be easily realized on experiment.

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Propose a scheme to realize multi-qubit GHZ states in superconducting quantum-interference devices(SQUIDs) via double Raman transition.In this scheme,the cavity field is only virtually excited and thus the cavity decay can be ignored.The GHZ states are realized by using only two basic states of the SQUID system and the relaxation of excited state of the system are avoided.Base on the points mentioned above,the scheme should be easily realized on experiment.
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 put forward a simple scheme for one-step realization of a two-qubit SWAP gate with SQUIDs (super-conducting quantum-interference devices) in cavity QED via Raman transition. In this scheme, the cavity field is only virtually excited and thus the cavity decay is suppressed. The SWAP gate is realized by using only two lower flux states of the SQUID system and the excited state would not be excited. Therefore, the effect of decoherence caused from the levels of the SQUID system is possibly minimized. The scheme can also be used to implement the SWAP gate with atoms.
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.
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.
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.