scholarly journals Entanglement purification of Gaussian continuous variable quantum states

2005 ◽  
Author(s):  
Lu-Ming Duan ◽  
G. Giedke ◽  
J.I. Cirac ◽  
P. Zoller
Keyword(s):  
Continuous Variable ◽  
Quantum States ◽  
Entanglement Purification

scholarly journals Entanglement Purification of Gaussian Continuous Variable Quantum States

2000 ◽  
Vol 84 (17) ◽  
pp. 4002-4005 ◽  
Author(s):  
Lu-Ming Duan ◽  
G. Giedke ◽  
J. I. Cirac ◽  
P. Zoller
Keyword(s):  
Continuous Variable ◽  
Quantum States ◽  
Entanglement Purification

Quantum dialogue protocol with four-mode continuous variable GHZ state

2019 ◽  
Vol 33 (05) ◽  
pp. 1950033 ◽  
Author(s):  
Ming-Hui Zhang ◽  
Jin-Ye Peng ◽  
Zheng-Wen Cao
Keyword(s):  
Channel Capacity ◽  
Quantum Channel ◽  
Beam Splitter ◽  
Information Leakage ◽  
Continuous Variable ◽  
Ghz State ◽  
Quantum States ◽  
Quantum Dialogue ◽  
Discrete Variable ◽  
Secret Information

Quantum dialogue can realize the mutual transmission of secret information between two legal users. In most of the existing quantum dialogue protocols, the information carriers applied in quantum dialogue are discrete variable (DV) quantum states. However, there are certain limitations on the preparation and detection of DV quantum states with current techniques. Continuous variable (CV) quantum states can overcome these problems effectively while improving the quantum channel capacity. In this paper, we propose a quantum dialogue protocol with four-mode continuous variable GHZ state. Compared with the existing CV-based quantum dialogue protocols, the protocol allows two users to transmit two groups of secret information with different lengths to each other simultaneously. The channel capacity of the protocol has been improved as each traveling mode carries two- or four-bits of information. In addition, the protocol has been proved to be secure against information leakage problem and some common attacks, such as beam splitter attack and intercept-and-resend attack.

A method for efficiently estimating non-Gaussianity of continuous-variable quantum states

2020 ◽  
Vol 74 (1) ◽  
Author(s):  
Shao-Hua Xiang ◽  
Yu-Jing Zhao ◽  
Cheng Xiang ◽  
Wei Wen ◽  
Xue-Wen Long
Keyword(s):  
Continuous Variable ◽  
Quantum States

scholarly journals Validation of entanglement purification by continuous variable polarization

2004 ◽  
Vol 6 (6) ◽  
pp. S473-S477 ◽  
Author(s):  
Francesca Alessandrini ◽  
Stefano Mancini ◽  
Paolo Tombesi
Keyword(s):  
Continuous Variable ◽  
Entanglement Purification

TELEPORTATION OF ANY FORM OF SINGLE-MODE QUANTUM STATES

2006 ◽  
Vol 20 (02n03) ◽  
pp. 97-103
Author(s):  
TONG-QIANG SONG
Keyword(s):  
Quantum Channel ◽  
Quantum Teleportation ◽  
Single Mode ◽  
Continuous Variable ◽  
Quantum States ◽  
Squeezed Vacuum ◽  
Einstein Podolsky Rosen ◽  
Epr Pair

By using the two-mode Einstein–Podolsky–Rosen (EPR) pair eigenstates or the two-mode squeezed vacuum as quantum channel we study the quantum teleportation of any form of single-mode quantum states (which include discrete and continuous variable quantum states). The elegant properties of the EPR pair eigenstates bring much convenience to our discussion.

scholarly journals Continuous-variable entanglement purification with atomic systems

2010 ◽  
Vol 27 (6) ◽  
pp. A198 ◽  
Author(s):  
Stojan Rebic ◽  
Stefano Mancini ◽  
Giovanna Morigi ◽  
David Vitali
Keyword(s):  
Continuous Variable ◽  
Entanglement Purification ◽  
Atomic Systems

scholarly journals About the use of fidelity in continuous variable systems

2014 ◽  
Vol 12 (02) ◽  
pp. 1461015 ◽  
Author(s):  
Antonio Mandarino ◽  
Matteo Bina ◽  
Stefano Olivares ◽  
Matteo G. A. Paris
Keyword(s):  
Physical Properties ◽  
Continuous Variable ◽  
Quantum States ◽  
High Fidelity ◽  
Non Gaussian ◽  
Additional Constraints

We present examples of continuous variable (CV) states having high fidelity to a given target, say F > 0.9 or F > 0.99, and still showing striking differences in their physical properties, including classical and quantum states within the set, separable and entangled ones, or nearly Gaussian and strongly non-Gaussian ones. We also show that the phenomenon persists also when one imposes additional constraints on the energy or the squeezing fraction of the states, thus generally questioning the use of fidelity to assess properties of CV systems without a tomographic set of additional constraints.

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