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LI Jun-gang, ZOU Jian, SHAO Bin. Quantum Entropy of a Single Cooper-Pair Box Interacting with Two Electromagnetic Fields[J]. JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2006, 15(1): 115-118.
Citation: LI Jun-gang, ZOU Jian, SHAO Bin. Quantum Entropy of a Single Cooper-Pair Box Interacting with Two Electromagnetic Fields[J].JOURNAL OF BEIJING INSTITUTE OF TECHNOLOGY, 2006, 15(1): 115-118.
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Quantum Entropy of a Single Cooper-Pair Box Interacting with Two Electromagnetic Fields

  • School of Science, Beijing Institute of Technology, Beijing 100081, China

Funds:theNationalNaturalScienceFoundationofChina(10374007)
  • Received Date:2004-09-29
    Abstract
  • A Hamiltonian which represents the interaction between a single Cooper-pair box and two quantized electromagnetic fields is considered in order to find new ways for quantum information. The wave function in Schrdinger picture is obtained. The evolution of the entropy of the box as a function of the scaled time is ploted to measure the entanglement between the box and the fields. It is found that the entanglement is sensitive to the detuning between the Josephson energy and the fields frequency, increasing the detuning can decrease the entanglement.
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