Continuous Variable Entanglement Distribution for Long-Distance Quantum Communication

2013 ◽  
Vol 30 (6) ◽  
pp. 060302 ◽  
Author(s):  
Jun-Jun Zhao ◽  
Xiao-Min Guo ◽  
Xu-Yang Wang ◽  
Ning Wang ◽  
Yong-Min Li ◽  
...  
Keyword(s):  
Quantum Communication ◽  
Continuous Variable ◽  
Long Distance ◽  
Entanglement Distribution

scholarly journals An error-free protocol for quantum entanglement distribution in long-distance quantum communication

2011 ◽  
Vol 56 (7) ◽  
pp. 618-625 ◽  
Author(s):  
Shamsolah Salemian ◽  
Shahram Mohammadnejad
Keyword(s):  
Quantum Entanglement ◽  
Quantum Communication ◽  
Long Distance ◽  
Entanglement Distribution

scholarly journals Continuous-Variable Quantum Secret Sharing Based on Thermal Terahertz Sources in Inter-Satellite Wireless Links

Entropy ◽  
2021 ◽  
Vol 23 (9) ◽  
pp. 1223
Author(s):  
Chengji Liu ◽  
Changhua Zhu ◽  
Zhihui Li ◽  
Min Nie ◽  
Hong Yang ◽  
...  
Keyword(s):  
Secret Sharing ◽  
Quantum Communication ◽  
Beam Splitter ◽  
Quantum Secret Sharing ◽  
Continuous Variable ◽  
Heterodyne Detection ◽  
Long Distance ◽  
Wireless Links ◽  
Satellite Links ◽  
Thz Sources

We propose a continuous-variable quantum secret sharing (CVQSS) scheme based on thermal terahertz (THz) sources in inter-satellite wireless links (THz-CVQSS). In this scheme, firstly, each player locally preforms Gaussian modulation to prepare a thermal THz state, and then couples it into a circulating spatiotemporal mode using a highly asymmetric beam splitter. At the end, the dealer measures the quadrature components of the received spatiotemporal mode through performing the heterodyne detection to share secure keys with all the players of a group. This design enables that the key can be recovered only by the whole group players’ knowledge in cooperation and neither a single player nor any subset of the players in the group can recover the key correctly. We analyze both the security and the performance of THz-CVQSS in inter-satellite links. Results show that a long-distance inter-satellite THz-CVQSS scheme with multiple players is feasible. This work will provide an effective way for building an inter-satellite quantum communication network.

scholarly journals Environment-assisted bosonic quantum communications

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Stefano Pirandola ◽  
Carlo Ottaviani ◽  
Christian S. Jacobsen ◽  
Gaetana Spedalieri ◽  
Samuel L. Braunstein ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Quantum Communication ◽  
Continuous Variable ◽  
Markovian Model ◽  
Quantum Communications ◽  
Case Scenario ◽  
Bipartite Entanglement ◽  
Worst Case ◽  
Entanglement Distribution ◽  
First Time

AbstractWe consider a quantum relay that is used by two parties to perform several continuous-variable protocols of quantum communication, from entanglement distribution (swapping and distillation) to quantum teleportation, and quantum key distribution. The theory of these protocols is suitably extended to a non-Markovian model of decoherence characterized by correlated Gaussian noise in the bosonic environment. In the worst-case scenario where bipartite entanglement is completely lost at the relay, we show that the various protocols can be reactivated by the assistance of classical (separable) correlations in the environment. In fact, above a critical amount, these correlations are able to guarantee the distribution of a weaker form of entanglement (quadripartite), which can be localized by the relay into a stronger form (bipartite) that is exploitable by the parties. Our findings are confirmed by a proof-of-principle experiment where we show, for the first time, that memory effects in the environment can drastically enhance the performance of a quantum relay, well beyond the single-repeater bound for quantum and private communications.

scholarly journals Quantum repeaters based on concatenated bosonic and discrete-variable quantum codes

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Filip Rozpędek ◽  
Kyungjoo Noh ◽  
Qian Xu ◽  
Saikat Guha ◽  
Liang Jiang
Keyword(s):  
Continuous Variable ◽  
Quantum Codes ◽  
Discrete Variable ◽  
Long Distance ◽  
Concatenated Code ◽  
Different Types ◽  
Optical Modes ◽  
Distance Communication ◽  
Quantum Repeaters ◽  
Quantum Error

AbstractWe propose an architecture of quantum-error-correction-based quantum repeaters that combines techniques used in discrete- and continuous-variable quantum information. Specifically, we propose to encode the transmitted qubits in a concatenated code consisting of two levels. On the first level we use a continuous-variable GKP code encoding the qubit in a single bosonic mode. On the second level we use a small discrete-variable code. Such an architecture has two important features. Firstly, errors on each of the two levels are corrected in repeaters of two different types. This enables for achieving performance needed in practical scenarios with a reduced cost with respect to an architecture for which all repeaters are the same. Secondly, the use of continuous-variable GKP code on the lower level generates additional analog information which enhances the error-correcting capabilities of the second-level code such that long-distance communication becomes possible with encodings consisting of only four or seven optical modes.

scholarly journals Long Distance Quantum Communication with Atomic Ensembles

2007 ◽  
pp. 553-580
Author(s):  
C. W. Chou ◽  
S. V. Polyakov ◽  
D. Felinto ◽  
H. de Riedmatten ◽  
S. J. van Enk ◽  
...  
Keyword(s):  
Quantum Communication ◽  
Atomic Ensembles ◽  
Long Distance

Optimized architectures for long distance quantum communication

2017 ◽  
Author(s):  
Linshu Li ◽  
Sreraman Muralidharan ◽  
Chang-Ling Zou ◽  
Victor V. Albert ◽  
Jungsang Kim ◽  
...  
Keyword(s):  
Quantum Communication ◽  
Long Distance

scholarly journals Long-distance continuous-variable quantum key distribution using separable Gaussian states

2018 ◽  
Vol 98 (4) ◽  
Author(s):  
Jian Zhou ◽  
Duan Huang ◽  
Ying Guo
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Continuous Variable ◽  
Long Distance ◽  
Gaussian States

Long-distance quantum communication just around the corner?

2001 ◽  
Vol 1 (3) ◽  
pp. 87-88
Author(s):  
P Kok ◽  
H Lee ◽  
N Cerf ◽  
J Dowling
Keyword(s):  
Quantum Communication ◽  
Long Distance

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