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素粒子論研究

An Efficient Scheme to Entangle Distant Qubits from an Arbitrary Mixed State(Quantum Field Theories : Fundamental Problems and Applications)

一哉 湯浅, 弘道 中里

Published Jun 20, 2005• 0 citations
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Theory of entanglement for mixed states(Fundamental Problems and Applications of Quantum Field Theory)

Satoshi Ishizaka

素粒子論研究•Apr 20, 2006•0 citations

1 A Simple Scheme to Entangle Distant Qubits from a Mixed State via an Entanglement Mediator

Kazuya Yuasa, Hiromichi Nakazato

A simple scheme to prepare an entanglement between two separated qubits from a given mixed state is proposed. A single qubit (entanglement mediator) is repeatedly made to interact locally and consecutively with the two qubits through rotating-wave couplings and is then measured. It is shown that we need to repeat this kind of process only three times to establish a maximally entangled state directly from an arbitrary initial mixed state, with no need to prepare the state of the qubits in advance or to rearrange the setup step by step. Furthermore, the maximum yield realizable with this scheme is compatible with the maximum entanglement, provided that the coupling constants are properly tuned. Entanglement is one of the peculiar concepts in quantum physics. It shows a nonlocal property of quantum mechanics, and is the essence of nonclassical phenomena. This concept is now regarded as a key to moving beyond classical ideas and plays a central role in the field of quantum information and computation. 1),2) The peculiarity of entanglement reveals itself especially when it involves spatially separated systems. Nonlocality has been studied in such situations, 3) and such an entanglement is of fundamental importance in quantum communication, for example,

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Efficient Multipartite Polarization Entanglement Distribution Over Arbitrary Noise Channel

Xiao Chen, Yan Li, Zhi Zeng +1 more

We present an efficient faithful multipartite polarization entanglement distribution protocol over an arbitrary noisy channel. The spatial degree of freedom is used to carry the entanglement during the transmission. We describe the principle by distributing n-qubit Greenberge—Horne—Zeilinger state and n-qubit W state. Our scheme can be used to distribute arbitrary n-qubit entangled states to n distant locations. The remote parties can obtain maximally entangled states deterministically on the polarization of photons. Only passive linear optics are employed in our setup, which makes our scheme more feasible and efficient for practical application in long distance quantum communication.

Communications in Theoretical Physics•Oct 1, 2013•3 citations

A Simple Scheme to Entangle Distant Qubits from a Mixed State via an Entanglement Mediator

K. Yuasa, H. Nakazato

A simple scheme to prepare an entanglement between two separated qubits from a given mixed state is proposed. A single qubit (entanglement mediator) is repeatedly made to interact locally and consecutively with the two qubits through rotating-wave couplings and is then measured. It is shown that we need to repeat this kind of process only three times to establish a maximally entangled state directly from an arbitrary initial mixed state, with no need to prepare the state of the qubits in advance or to rearrange the setup step by step. Furthermore, the maximum yield realizable with this scheme is compatible with the maximum entanglement, provided that the coupling constants are properly tuned.

arXiv:quant-ph/0411193•Progress of Theoretical Physics•Sep 1, 2005•14 citations

Controlling Entanglement in Multi-Qubit System with an External Field

Zhiyong Liu, Kui-Hua Gong

International Journal of Theoretical Physics•Apr 20, 2013•0 citations
A simple scheme to prepare an entanglement between two separated qubits from a given mixed state is proposed. A single qubit (entanglement mediator) is repeatedly made to interact locally and consecutively with the two qubits through rotating-wave couplings and is then measured. It is shown that we need to repeat this kind of process only three times to establish a maximally entangled state directly from an arbitrary initial mixed state, with no need to prepare the state of the qubits in advance or to rearrange the setup step by step. Furthermore, the maximum yield realizable with this scheme is compatible with the maximum entanglement, provided that the coupling constants are properly tuned. Entanglement is one of the peculiar concepts in quantum physics. It shows a nonlocal property of quantum mechanics, and is the essence of nonclassical phenomena. This concept is now regarded as a key to moving beyond classical ideas and plays a central role in the field of quantum information and computation. 1),2) The peculiarity of entanglement reveals itself especially when it involves spatially separated systems. Nonlocality has been studied in such situations, 3) and such an entanglement is of fundamental importance in quantum communication, for example,
We present an efficient faithful multipartite polarization entanglement distribution protocol over an arbitrary noisy channel. The spatial degree of freedom is used to carry the entanglement during the transmission. We describe the principle by distributing n-qubit Greenberge—Horne—Zeilinger state and n-qubit W state. Our scheme can be used to distribute arbitrary n-qubit entangled states to n distant locations. The remote parties can obtain maximally entangled states deterministically on the polarization of photons. Only passive linear optics are employed in our setup, which makes our scheme more feasible and efficient for practical application in long distance quantum communication.
A simple scheme to prepare an entanglement between two separated qubits from a given mixed state is proposed. A single qubit (entanglement mediator) is repeatedly made to interact locally and consecutively with the two qubits through rotating-wave couplings and is then measured. It is shown that we need to repeat this kind of process only three times to establish a maximally entangled state directly from an arbitrary initial mixed state, with no need to prepare the state of the qubits in advance or to rearrange the setup step by step. Furthermore, the maximum yield realizable with this scheme is compatible with the maximum entanglement, provided that the coupling constants are properly tuned.