Multiple-copy two-state discrimination with individual measurements

Optimal sequential measurements for bipartite state discrimination

Multiple de novo copy number variations in two subjects with developmental problems and multiple congenital anomalies

Background De novo copy number variation (CNV) can occur constitutionally in gametogenesis or in early development leading to sporadic genomic disorders. Such de novo CNVs appear to also be important in somatic mutagenesis relevant to cancer and population events important to species evolution. Since large pathological CNVs are rarely observed at more than one locus in a single patient, and are...

Entanglement in channel discrimination with restricted measurements

We study the power of measurements implementable with local quantum operations and classical communication (or LOCC measurements for short) in the setting of quantum channel discrimination. More precisely, we consider discrimination procedures that attempt to identify an unknown channel, chosen uniformly from two known alternatives, that take the following form: (i) the input to the unknown cha...

Quantum state sharing of an arbitrary two-qubit state with two-photon entanglements and Bell-state measurements

Fu-Guo Deng, Xi-Han Li, Chun-Yan Li, Ping Zhou, and Hong-Yu Zhou 1 Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University, Beijing 100875, People’s Republic of China 2 Institute of Low Energy Nuclear Physics, and Department of Material Science and Engineering, Beijing Normal University, Beijing 100875, People’s Republic of China 3 Beijing...

Optimal unambiguous discrimination of two subspaces as a case in mixed state discrimination

We show how to optimally unambiguously discriminate between two subspaces of a Hilbert space. In particular we suppose that we are given a quantum system in either the state |ψ1〉, where |ψ1〉 can be any state in the subspace S1, or |ψ2〉, where |ψ2〉 can be any state in the subspace S2, and our task is to determine in which of the subspaces the state of our quantum system lies. We do not want to m...