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Title:

2.1 Quantum states, operations, and measurements. 7

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Quantum communication

Quantum communication Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-06-21

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http://edoc.ub.uni-muenchen.de/3588/1/Aschauer_Hans.pdf

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text

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en

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Title:

Quantum Communication and Decoherence

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-01-15

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http://arxiv.org/pdf/quant-ph/0208014v2.pdf

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text

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en

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Title:

Quantum Communication and Decoherence

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-01-15

Source:

http://arxiv.org/pdf/quant-ph/0208014v1.pdf

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text

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en

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Title:

Quantum communication in noisy environments

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In this thesis, we investigate how protocols in quantum communication theory are influenced by noise. Specifically, we take into account noise during the transmission of quantum information and noise during the processing of quantum information. We describe three novel quantum communication protocols which can be accomplished efficiently in a no...

In this thesis, we investigate how protocols in quantum communication theory are influenced by noise. Specifically, we take into account noise during the transmission of quantum information and noise during the processing of quantum information. We describe three novel quantum communication protocols which can be accomplished efficiently in a noisy environment: (1) Factorization of Eve: We show that it is possible to disentangle transmitted qubits a posteriori from the quantum channel's degrees of freedom. (2) Cluster state purification: We give multi-partite entanglement purification protocols for a large class of entangled quantum states. (3) Entanglement purification protocols from quantum codes: We describe a constructive method to create bipartite entanglement purification protocols form quantum error correcting codes, and investigate the properties of these protocols, which can be operated in two different modes, which are related to quantum communication and quantum computation protocols, respectively. Minimize

Publisher:

Ludwig-Maximilians-Universität München

Year of Publication:

2005-04-27

Document Type:

Dissertation ; NonPeerReviewed

Subjects:

Fakultät für Physik

Fakultät für Physik Minimize

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http://edoc.ub.uni-muenchen.de/3588/

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Entanglement purification with noisy apparatus can be used to factor out an eavesdropper

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We give a proof that entanglement purification, even with noisy apparatus, is sufficient to disentangle an eavesdropper (Eve) from the communication channel. Our proof applies to all possible attacks (individual and coherent). Due to the quantum nature of the entanglement purification protocol, it is also possible to use the obtained quantum cha...

We give a proof that entanglement purification, even with noisy apparatus, is sufficient to disentangle an eavesdropper (Eve) from the communication channel. Our proof applies to all possible attacks (individual and coherent). Due to the quantum nature of the entanglement purification protocol, it is also possible to use the obtained quantum channel for secure transmission of quantum information. Minimize

Year of Publication:

2001-08-13

Document Type:

text

Subjects:

Quantum Physics

Quantum Physics Minimize

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Title:

A security proof of quantum cryptography based entirely on entanglement purification

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We give a proof that entanglement purification, even with noisy apparatus, is sufficient to disentangle an eavesdropper (Eve) from the communication channel. In the security regime, the purification process factorises the overall initial state into a tensor-product state of Alice and Bob, on one side, and Eve on the other side, thus establishing...

We give a proof that entanglement purification, even with noisy apparatus, is sufficient to disentangle an eavesdropper (Eve) from the communication channel. In the security regime, the purification process factorises the overall initial state into a tensor-product state of Alice and Bob, on one side, and Eve on the other side, thus establishing a completely private, albeit noisy, quantum communication channel between Alice and Bob. The security regime is found to coincide for all practical purposes with the purification regime of a two-way recurrence protocol. This makes two-way entanglement purification protocols, which constitute an important element in the quantum repeater, an efficient tool for secure long-distance quantum cryptography. ; Comment: Follow-up paper to quant-ph/0108060, submitted to PRA; 24 pages, revex4 Minimize

Year of Publication:

2001-11-12

Document Type:

text

Subjects:

Quantum Physics

Quantum Physics Minimize

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Title:

Quantum Communication and Decoherence

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In this contribution we will give a brief overview on the methods used to overcome decoherence in quantum communication protocols. We give an introduction to quantum error correction, entanglement purification and quantum cryptography. It is shown that entanglement purification can be used to create ``private entanglement'', which makes it a use...

In this contribution we will give a brief overview on the methods used to overcome decoherence in quantum communication protocols. We give an introduction to quantum error correction, entanglement purification and quantum cryptography. It is shown that entanglement purification can be used to create ``private entanglement'', which makes it a useful tool for cryptographic protocols. ; Comment: 31 pages, 10 figures, LaTeX, book chapter to appear in ``Coherent Evolution in Noisy Environments'', Lecture Notes in Physics, (Springer Verlag, Berlin-Heidelberg-New York). Minor typos corrected Minimize

Year of Publication:

2002-08-02

Document Type:

text

Subjects:

Quantum Physics

Quantum Physics Minimize

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Title:

Private entanglement over arbitrary distances, even using noisy apparatus

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We give a security proof of quantum cryptography based entirely on entanglement purification. Our proof applies to all possible attacks (individual and coherent). It implies the security of cryptographic keys distributed with the help of entanglement-based quantum repeaters. We prove the security of the obtained quantum channel which may not onl...

We give a security proof of quantum cryptography based entirely on entanglement purification. Our proof applies to all possible attacks (individual and coherent). It implies the security of cryptographic keys distributed with the help of entanglement-based quantum repeaters. We prove the security of the obtained quantum channel which may not only be used for quantum key distribution, but also for secure, albeit noisy, transmission of quantum information. ; Comment: Title changed. Accepted for publication in Physical Review Letters Minimize

Year of Publication:

2000-08-10

Document Type:

text

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Quantum Physics

Quantum Physics Minimize

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Title:

Local invariants for multi-partite entangled states allowing for a simple entanglement criterion

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We present local invariants of multi-partite pure or mixed states, which can be easily calculated and have a straight-forward physical meaning. As an application, we derive a new entanglement criterion for arbitrary mixed states of $n$ parties. The new criterion is weaker than the partial transposition criterion but offers advantages for the stu...

We present local invariants of multi-partite pure or mixed states, which can be easily calculated and have a straight-forward physical meaning. As an application, we derive a new entanglement criterion for arbitrary mixed states of $n$ parties. The new criterion is weaker than the partial transposition criterion but offers advantages for the study of multipartite systems. A straightforward generalization of these invariants allows for the construction of a complete set of observable polynomial invariants. ; Comment: 12 pages. Version 3: minor corrections Minimize

Year of Publication:

2003-06-06

Document Type:

text

Subjects:

Quantum Physics

Quantum Physics Minimize

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Title:

Themenheft "Tourismus und Terrorismus"

Publisher:

Lucius & Lucius

Contributors:

Aschauer, Wolfgang ; Hopfinger, Hans ; Kagermeier, Andreas

Year of Publication:

2009

Document Type:

Buch

Subjects:

R Geographie

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Themenheft "Tourismus und Terrorismus". Hrsg.: Aschauer, Wolfgang ; Hopfinger, Hans ; Kagermeier, Andreas Stuttgart : Lucius & Lucius, 2009. - (Zeitschrift für Tourismuswissenschaft ; 1,1) ISSN 1867-9501

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