Distort one qubit from copying and deleting

Authors:
Ming-Xing Luo;Yun Deng
Affiliations:
Information Security Center, School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China 610031;Institute of Computer Science, Sichuan University of Science Engineering, Zigong, China 64300
Venue:
Quantum Information Processing
Year:
2013

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Abstract

Immeasurability of a quantum state has important consequence in practical implementation of quantum computers. Our purpose is to analyze the efficiency of the entangled output of Pati-Braunstein deleting machine or Wootters-Zurek quantum copying machine as a quantum channel. Interestingly we find that for special values of the input parameter the state does not violate the Bell's inequality. Moreover, we analyze the performances of the entangled output of Pati-Braunstein deleting after the Wootters-Zurek copying machine.