Decoherence of Two-qubits Coupled with Reservoirs Studied with New Ket-Bra Entangled State Method

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• 作者：Yi-Chong Ren ; Hong-Yi Fan
• 关键词：Ket ; Bra entangled state ; Schrödinger ; like equation ; Master equation ; Decoherence and concurrence
• 刊名：International Journal of Theoretical Physics
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：55
• 期：4
• 页码：2089-2096
• 全文大小：688 KB
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• 作者单位：Yi-Chong Ren (1)
  Hong-Yi Fan (1)
  
  1. University of Science and Technology of China, Hefei, Anhui, 230026, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Physics
  Quantum Physics
  Elementary Particles and Quantum Field Theory
  Mathematical and Computational Physics
  
• 出版者：Springer Netherlands
• ISSN：1572-9575

文摘

For the first time we define a so-called Ket-Bra Entangled State (KBES) for two-qubits coupled with reservoirs by introduce an extra fictitious mode vector, and convert the corresponding master equation into Schrödinger-like equation by virtue of this state. Via this approach we concisely obtain the dynamic evolution of two uncoupled qubits each immersed in local thermal noise. Based on this, the decoherence evolution for the extended Werner-like states is derived and how purity and temperature influence the concurrence is analyzed. This KBES method may also be applied to tackling master equations of limited atomic level systems.