scholarly journals Preliminary results on numerical characterization of atmospheric effects on an Earth-Space quantum communication channel

2006 ◽  
Author(s):  
N. Antonietti ◽  
M. Mondin ◽  
G. Brida ◽  
M. Genovese
Keyword(s):  
Communication Channel ◽  
Quantum Communication ◽  
Atmospheric Effects ◽  
Earth Space ◽  
Preliminary Results ◽  
Quantum Communication Channel ◽  
Numerical Characterization

scholarly journals NUMERICAL CHARACTERIZATION OF ATMOSPHERIC EFFECTS ON AN EARTH–SPACE QUANTUM COMMUNICATION CHANNEL

2007 ◽  
Vol 05 (01n02) ◽  
pp. 241-248 ◽  
Author(s):  
N. ANTONIETTI ◽  
M. MONDIN ◽  
G. BRIDA ◽  
M. GENOVESE
Keyword(s):  
Free Space ◽  
Communication Channel ◽  
Quantum Communication ◽  
Single Photon ◽  
Atmospheric Effects ◽  
Single Photons ◽  
Atmospheric Conditions ◽  
Numerical Characterization ◽  
Simulation Results

Quantum communication in free space is the next challenge of telecommunications. Since we want to determine the outcome of a quantum communication by means of single photons, we must understand how a single photon interacts with the atmosphere. In this brief article, some simulation results for realistic and generic atmospheric conditions are reported and discussed.

Performance characterization of Pauli channels assisted by indefinite causal order and post-measurement

2020 ◽  
Vol 20 (15&16) ◽  
pp. 1261-1280
Author(s):  
Francisco Delgado ◽  
Carlos Cardoso-Isidoro
Keyword(s):  
Quantum Channel ◽  
Communication Channel ◽  
Quantum Communication ◽  
Quantum Channels ◽  
Causal Order ◽  
Combined Process ◽  
Performance Characterization ◽  
Output State ◽  
Transmission Of Information

Indefinite causal order has introduced disruptive procedures to improve the fidelity of quantum communication by introducing the superposition of { orders} on a set of quantum channels. It has been applied to several well characterized quantum channels as depolarizing, dephasing and teleportation. This work analyses the behavior of a parametric quantum channel for single qubits expressed in the form of Pauli channels. Combinatorics lets to obtain affordable formulas for the analysis of the output state of the channel when it goes through a certain imperfect quantum communication channel when it is deployed as a redundant application of it under indefinite causal order. In addition, the process exploits post-measurement on the associated control to select certain components of transmission. Then, the fidelity of such outputs is analysed to characterize the generic channel in terms of its parameters. As a result, we get notable enhancement in the transmission of information for well characterized channels due to the combined process: indefinite causal order plus post-measurement.

scholarly journals Information rate in quantum communication channel with depolarization at characters encoding with orthogonal quantum states

2013 ◽  
Vol 19 (2) ◽  
Author(s):  
Евгений Викторович Василиу ◽  
Иван Романович Гулаков ◽  
Андрей Олегович Зеневич ◽  
Александр Михалович Тимофеев ◽  
Сергей Валентинович Николаенко
Keyword(s):  
Communication Channel ◽  
Quantum Communication ◽  
Quantum States ◽  
Information Rate ◽  
Quantum Communication Channel

AUTHENTICATED QUANTUM KEY DISTRIBUTION WITHOUT CLASSICAL COMMUNICATION

2007 ◽  
Vol 17 (03) ◽  
pp. 323-335 ◽  
Author(s):  
NAYA NAGY ◽  
SELIM G. AKL
Keyword(s):  
Quantum Channel ◽  
Quantum Key Distribution ◽  
Communication Channel ◽  
Quantum Communication ◽  
Key Distribution ◽  
Secret Key ◽  
Classical Communication ◽  
Quantum Communication Channel ◽  
High Security ◽  
Public Keys

The aim of quantum key distribution protocols is to establish a secret key among two parties with high security confidence. Such algorithms generally require a quantum channel and an authenticated classical channel. This paper presents a totally new perception of communication in such protocols. The quantum communication alone satisfies all needs of array communication between the two parties. Even so, the quantum communication channel does not need to be protected or authenticated whatsoever. As such, our algorithm is a purely quantum key distribution algorithm. The only certain identification of the two parties is through public keys.

scholarly journals Semi-loss-tolerant strong coin flipping protocol using EPR pairs

2012 ◽  
Vol 12 (5&6) ◽  
pp. 490-501
Author(s):  
Jia-Jun Ma ◽  
Fen-Zhuo Guo ◽  
Qian Yang ◽  
Yan-Bing Li ◽  
Qiao-Yan Wen
Keyword(s):  
Communication Channel ◽  
Quantum Communication ◽  
Quantum Memory ◽  
Memory Storage ◽  
Epr Pairs ◽  
Quantum Communication Channel ◽  
Coin Flipping ◽  
Epr Pair ◽  
Push Down

In this paper, we present a quantum strong coin flipping protocol. In this protocol, an EPR pair and a quantum memory storage are made use of, and losses in the quantum communication channel and quantum memory storage are all analyzed. We obtain the bias in the fair scenario as a function of $p$, where $p$ is the probability that the particle in Bob's quantum memory storage is lost, which means our bias varies as the degree of losses in the quantum memory storage changes. Therefore we call our protocol semi-loss-tolerant. We also show that the bias decreases with decreasing $p$. When $p$ approaches $0$, the bias approaches 0.3536, which is less than that of all the previous loss-tolerant protocols. Details of both parties' optimal cheating strategies are also given and analyzed. What's more, experimental feasibility is discussed and demonstrated. Compared with previous qubit-based loss-tolerant SCF protocols, we introduce the EPR pair to keep our protocol loss-tolerant while trying to push down the bias. In addition, a quantum memory storage is used and the losses in it has been taken into account. We obtain the bias in the fair scenario as a function of $p$, where $p$ is the probability that the particle in Bob's quantum memory storage is lost, which means our bias varies as the degree of losses in the quantum memory storage changes. We also show that the bias decreases with decreasing $p$. When $p$ approaches $0$, the bias approaches 0.3536, which is less than that of all the previous loss-tolerant protocols. Details of both parties' optimal cheating strategies are also given and analyzed. Besides, experimental feasibility is discussed and demonstrated.

Manipulation of Quantum Communication Channel via Two-Level Atom Interacting with Caving Fields

2014 ◽  
Vol 571-572 ◽  
pp. 469-472
Author(s):  
Xin Hua Cai ◽  
Jian Jun Nie
Keyword(s):  
Quantum Electrodynamics ◽  
Coherent States ◽  
Communication Channel ◽  
Quantum Communication ◽  
Cavity Quantum Electrodynamics ◽  
Entanglement Concentration ◽  
Field Interaction ◽  
Entangled Coherent State ◽  
Level Atom ◽  
Quantum Communication Channel

Base on the dispersive atom-cavity field interaction, the scheme for preparing the entangled coherent state is discussed. An experimentally feasible protocol for realizing entanglement concentration of the entangled coherent states by using a two-level atom interacting with caving fields is proposed. In this protocol, the entanglement between two coherent states, and , with the same amplitude but a phase difference is utilized as the quantum communication channel. The process of the entanglement concentration is implemented by using a two-level atom interacting with caving fields and two-modes orthogonal states measurement. With the present development of cavity quantum electrodynamics (QED) techniques, the scheme can be achieved.

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