The remote implementation of all possible generalized quantum measurement on single atomic qubit in a quantum network |
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Authors: | Han Yang Wu Chun-Wang Wu Wei Chen Ping-Xing and Li Cheng-Zu |
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Institution: | College of Science, National University of Defense Technology, Changsha 410073, China |
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Abstract: | To implement generalized quantum measurement (GQM) one has to extend
the original Hilbert space. Generally speaking, the additional
dimensions of the ancilla space increase as the number of the
operators of the GQM n increases. This paper presents a scheme for
deterministically implementing all possible n-operator GQMs on a
single atomic qubit by using only one 2-dimensional ancillary atomic
qubit repeatedly, which remarkably reduces the complexity of the
realistic physical system. Here the qubit is encoded in the internal states
of an atom trapped in an optical cavity and single-photon pulses are
employed to provide the interaction between qubits. It shows that
the scheme can be performed remotely, and thus it is suitable for
implementing GQM in a quantum network. What is more, the number of the
total ancilla dimensions in our scheme achieves the theoretic low
bound. |
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Keywords: | generalized quantum measurement single atomic qubit cavity-QED |
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