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Entanglement purification through Zeno-like measurements

Kazuya Yuasa, Hiromichi Nakazato, Makoto Unoki

We present a novel method for purifying quantum states, i.e. purification through Zeno-like measurements, and show an application to entanglement purification.

arXiv:quant-ph/0402184Journal of Modern OpticsApr 1, 20042 citations

Purification of Quantum State Through Zeno-Like Measurements

Kazuya Yuasa, Hiromichi Nakazato, Tomoko Takazawa

We present a novel procedure to purify quantum states, i.e., purification through Zeno-like measurements. By simply repeating one and the same measurement on a quantum system, one can purify another system in interaction with the former. The conditions for the (efficient) purification are specified on a rather general setting, and the framework of the method possesses wide applicability. It is explicitly demonstrated on a specific setup that the purification becomes very efficient by tuning relevant parameters.We present a novel procedure to purify quantum states, i.e., purification through Zeno-like measurements. By simply repeating one and the same measurement on a quantum system, one can purify another system in interaction with the former. The conditions for the (efficient) purification are specified on a rather general setting, and the framework of the method possesses wide applicability. It is explicitly demonstrated on a specific setup that the purification becomes very efficient by tuning relevant parameters.

arXiv:quant-ph/0402183Journal of the Physical Society of JapanJan 1, 20033 citations

Preparation of quantum state through Zeno-like measurements

Kazuya Yuasa, Hiromichi Nakazato

We present a novel method for preparing pure quantum states, i.e., purification through Zeno-like measurements , and its possible applications and extensions.

Journal of Physics Conference SeriesMar 21, 20060 citations

Preparation and entanglement purification of qubits through Zeno-like measurements

Hiromichi Nakazato, Makoto Unoki, Kazuya Yuasa

A method of purification, purification through Zeno-like measurements [H. Nakazato, T. Takazawa, and K. Yuasa, Phys. Rev. Lett. 90, 060401 (2003)], is discussed extensively and applied to a few simple qubit systems. It is explicitly demonstrated how it works and how it is optimized. As possible applications, schemes for initialization of multiple qubits and entanglement purification are presented, and their efficiency is investigated in detail. Simplicity and flexibility of the idea allow us to apply it to various kinds of settings in quantum information and computation, and would provide us with useful and practical methods of state preparation.A method of purification, purification through Zeno-like measurements [H. Nakazato, T. Takazawa, and K. Yuasa, Phys. Rev. Lett. 90, 060401 (2003)], is discussed extensively and applied to a few simple qubit systems. It is explicitly demonstrated how it works and how it is optimized. As possible applications, schemes for initialization of multiple qubits and entanglement purification are presented, and their efficiency is investigated in detail. Simplicity and flexibility of the idea allow us to apply it to various kinds of settings in quantum information and computation, and would provide us with useful and practical methods of state preparation.

arXiv:quant-ph/0402182Physical Review AJul 2, 200459 citations

Purification through Zeno-like measurements: Variety of projective measurements

Makoto Unoki

We investigate an extension of a scheme for purification of quantum states called purification through Zeno-like measurements. In original scheme one repeatedly performs an identical projective measurement, we extend this scheme to the case that measured states are not identical at each time.

Journal of Physics Conference SeriesMar 21, 20060 citations

Purification through Zeno-Like Measurements

Hiromichi Nakazato, Tomoko Takazawa, Kazuya Yuasa

A series of frequent measurements on a quantum system (Zeno-like measurements) is shown to result in the "purification" of another quantum system in interaction with the former. Even though the measurements are performed on the former system, their effect drives the latter into a pure state, irrespectively of its initial (mixed) state, provided certain conditions are satisfied.

arXiv:quant-ph/0301026Physical Review LettersFeb 10, 2003106 citations

Entanglement purification through Zeno-like measurements

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Entanglement purification through Zeno-like measurements

Abstract

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