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Journal of Atomic and Molecular Physics

Generation of entangled state using superconducting quantum interference devices

Daimu Wang

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

We propose a new scheme to generate a maximally entangled state of two superconducting quantum interference devices with a nonresonant cavity.In this scheme,the cavity field is virtually excited,no quantum-information transfer exists between the SQUIDs system and the cavity field,thus the requirement on the quality factor of the cavity is greatly relaxed.

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We propose a new scheme to generate a maximally entangled state of two superconducting quantum interference devices with a nonresonant cavity.In this scheme,the cavity field is virtually excited,no quantum-information transfer exists between the SQUIDs system and the cavity field,thus the requirement on the quality factor of the cavity is greatly relaxed.
We present a scheme to achieve maximally entangled states, controlled phase-shift gate, and SWAP gate for two superconducting-quantum-interference-device (SQUID) qubits, by placing SQUIDs in a microwave cavity. We also show how to transfer quantum information from one SQUID qubit to another. In this scheme, no transfer of quantum information between the SQUIDs and the cavity is required, the cavity field is only virtually excited and thus the requirement on the quality factor of the cavity is greatly relaxed.
We propose a scheme for transferring Quantum information via superconducting quantum interference device (SQUID) qubits and cavity field interaction with a large detuning. In the scheme, no quantum information is transferred between the SQUIDs and the cavities,the cavity-fields are only virtually excited,thus the requirement on the quality factor of the cavities is greatly relaxed. In addition,in the scheme the quantum information can be directly transferred with a successful probability of 100% in a simple manner. And meanwhile we can establish a network for transferring quantum information between SQUID qubits.
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.
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.