Browsing by Author "Zhang, Shengyu"

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Browsing by Author "Zhang, Shengyu"

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  • Feng, Yuan; Zhang, Shengyu; Duan, Runyao; Ying, Mingsheng (American Physical Soc, 2002)
    We derive a lower bound on the inconclusive probability of unambiguous discrimination among n linearly independent quantum states by using the constraint of no signaling. It improves the bound presented in the. paper of ...
  • Sun, Xiaoming; Zhang, Shengyu; Feng, Yuan; Ying, Mingsheng (American Physical Soc, 2002)
    Unambiguous discrimination is a strategy to the discrimination problem that identifies the state with certainty, leaving a possibility of undecidability. This paper points out that the optimal success probability of ...
  • Feng, Yuan; Zhang, Shengyu; Ying, Mingsheng (American Physical Soc, 2002)
    We construct a probabilistic cloning and deleting machine which, taking several copies of an input quantum state, can output a linear superposition of multiple cloning and deleting states. Since the machine can perform ...
  • Zhang, Shengyu; Ying, Mingsheng (American Physical Soc, 2002)
    We introduce a notion of set discrimination, which is an interesting extension of quantum state discrimination. A state is secretly chosen from a number of quantum states, which are partitioned into some disjoint sets. A ...
  • Feng, Yuan; Zhang, Shengyu; Sun, Xiaoming; Ying, Mingsheng (Elsevier Science Bv, 2002)
    We show that an arbitrary quantum state cannot be universally 1 --> 2 copied keeping the original copy unchanged. Indeed, the density operator of the additional copy after the copying transformation is nothing but the scale ...
  • Zhang, Shengyu; Feng, Yuan; Sun, Xiaoming; Ying, Mingsheng (American Physical Soc, 2001)
    One strategy to the discrimination problem is to identify the state with certainty, leaving a possibility of undecidability. This paper gives an upper bound for the maximal success probability of unambiguous discrimination ...