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Journal of Atomic and Molecular Physics

Quantum information transfer with superconducting quantum interference device qubits in cavity QED

Ni Zhi

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

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.

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Acta Sinica Quantum Optica•Jan 1, 2010•0 citations
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 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.
A novel scheme is proposed for realizing quantum entanglement, quantum information transfer and a set of universal quantum gates with superconducting-quantum-interference-device (SQUID) qubits in cavity QED. In the scheme, the two logical states of a qubit are the two lowest levels of the SQUID. An intermediate level of the SQUID is utilized to facilitate coherent control and manipulation of quantum states of the qubits. The method presented here does not create finite intermediate-level population or cavity-photon population during the operations. Thus, decoherence due to spontaneous decay from the intermediate levels is minimized and the requirement on the quality factor of the cavity is greatly loosened.
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 two schemes for realizing 1→2 economical phase-covariant quantum cloning with superconducting quantum-interference devices(SQUID) in cavity QED.In our schemes,the SQUIDs with three levels act with a quantized cavity field and classical microwave pluses via Raman transition.On the condition of large detuning,the excited state would be eliminated adiabaticly.During the whole operation,the cavity field is in the vacuum state at all times,so there is no transfer of quantum information between the SQUIDs and cavity,thus the cavity decay is largely suppressed.By using this method,we can realize the phase-covariant quantum cloning by four steps.