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Super-additivity and entanglement assistance in quantum reading

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JournalQUANTUM INFORMATION COMPUTATION
DateAccepted/In press - 12 Jan 2017
DatePublished (current) - 1 Jun 2017
Issue number7-8
Volume17
Number of pages12
Pages (from-to)611-622
Original languageEnglish

Abstract

Quantum information theory determines the maximum rates at which information can be transmitted through physical systems described by quantum mechanics. Here we consider the communication protocol known as quantum reading. Quantum reading is a protocol for retrieving the information stored in a digital memory by using a quantum probe, e.g., shining quantum states of light to read an optical memory. In a variety of situations using a quantum probe enhances the performance of the reading protocol in terms of fidelity, data density and energy efficiency. Here we review and characterize the quantum reading capacity of a memory model, defined as the maximum rate of reliable reading. We show that, like other quantities in quantum information theory, the quantum reading capacity is super-additive. Moreover, we determine conditions under which the use of an entangled ancilla improves the performance of quantum reading.

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    Research areas

  • Entanglement, Quantum communication, Quantum reading

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