CONTROLLED DENSE CODING VIA GHZ-CLASS STATE

A controlled quantum dense coding protocol with GHZ-class state is proposed. In this case the sender (Alice) can send information to the receiver (Bob), whereas the supervisor (Cliff) can control the quantum channel between Alice and Bob via his local measurement. The amount of classical information is shown to be controlled by the supervisor through adjustments of the local measurement angles and depend on the coefficients of the original GHZ-class state. We also give two concrete methods for Alice to deal with one of Cliff's measurement result which is more complicated.

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CONTROLLED DENSE CODING WITH CLUSTER STATE

International Journal of Quantum Information ◽

10.1142/s0219749912500220 ◽

2012 ◽

Vol 10 (02) ◽

pp. 1250022 ◽

Cited By ~ 3

Author(s):

GUO-QIANG HUANG ◽

CUI-LAN LUO

Keyword(s):

Cluster State ◽

Local Measurement ◽

Dense Coding ◽

Average Amount ◽

Particle Cluster ◽

Controlled Dense Coding ◽

Average Amount Of Information ◽

One Dimensional ◽

Amount Of Information

Two schemes for controlled dense coding with a one-dimensional four-particle cluster state are investigated. In this protocol, the supervisor (Cliff) can control the channel and the average amount of information transmitted from the sender (Alice) to the receiver (Bob) by adjusting the local measurement angle θ. It is shown that the results for the average amounts of information are unique from the different two schemes.

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Quantum dense coding of continuous variables in a noisy quantum channel

Journal of Optics B Quantum and Semiclassical Optics ◽

10.1088/1464-4266/2/6/311 ◽

2000 ◽

Vol 2 (6) ◽

pp. 786-791 ◽

Cited By ~ 37

Author(s):

Masashi Ban

Keyword(s):

Quantum Channel ◽

Continuous Variables ◽

Dense Coding ◽

Quantum Dense Coding ◽

Noisy Quantum Channel

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CONTROLLED DENSE CODING VIA GENERALIZED MEASUREMENT

International Journal of Quantum Information ◽

10.1142/s0219749909004670 ◽

2009 ◽

Vol 07 (01) ◽

pp. 365-372 ◽

Cited By ~ 6

Author(s):

CUI-LAN LUO ◽

XIAO-FANG OUYANG

Keyword(s):

Quantum Channel ◽

Ghz State ◽

Dense Coding ◽

Average Amount ◽

Controlled Dense Coding ◽

Average Amount Of Information ◽

Generalized Measurement ◽

Amount Of Information

A scheme of realizing controlled dense coding via generalized measurement was presented. In this protocol, the supervisor can control the entanglement between the sender and the receiver and then the average amount of information transmitted from the sender to the receiver by only adjusting measurement angle θ. It is shown that when the quantum channel was a GHZ state, the entanglement and the average amount of information are determined by supervisor's measurement angle θ only; whereas when the quantum channel was a GHZ-class state, those are determined not only by supervisor's measurement angle θ but also the minimal coefficient of the GHZ-class state.

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GENERALIZED CONTROLLED DENSE CODING WITH MAXIMALLY ENTANGLED MULTIQUBIT STATES

International Journal of Quantum Information ◽

10.1142/s0219749910006319 ◽

2010 ◽

Vol 08 (06) ◽

pp. 947-960

Author(s):

ATUL KUMAR ◽

MANGALA SUNDER KRISHNAN

Keyword(s):

Quantum Channel ◽

Information Transfer ◽

Communication Protocol ◽

Dense Coding ◽

Controlled Dense Coding ◽

Statistical Correlations ◽

Measurement Results ◽

Quantum Statistical ◽

Average Information ◽

Qubit States

Controlled dense coding which uses different five-qubit entangled systems is described in this article. Using a criterion based on quantum-statistical correlations to define the extent of entanglement, five-qubit states are shown to have genuine entanglement. Different schemes which are easily implementable experimentally for a receiver to decode the message from a sender are described. The importance of representation of a quantum channel and distribution of qubits in a communication protocol are emphasized. It is observed that when a controller is involved it is desirable that measurement results are transmitted to the receiver and not to the sender for experimental convenience. In addition, a controlled dense coding protocol for average information transfer is given for arbitrary (2N + 1)-qubit entangled systems, using the above schemes.

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CONTROLLED DENSE CODING WITH EXTENDED GHZ STATE

International Journal of Quantum Information ◽

10.1142/s0219749909005481 ◽

2009 ◽

Vol 07 (06) ◽

pp. 1241-1248 ◽

Cited By ~ 2

Author(s):

GUO-QIANG HUANG ◽

CUI-LAN LUO

Keyword(s):

Ghz State ◽

Local Measurement ◽

Dense Coding ◽

Average Amount ◽

Controlled Dense Coding ◽

Average Amount Of Information ◽

Amount Of Information

Two schemes for controlled dense coding with a extended GHZ state are investigated. In these protocols, the supervisor (Cliff) can control the average amount of information transmitted from the sender (Alice) to the receiver (Bob) only by adjusting his local measurement angle θ. It is shown that the results for the average amounts of information are unique from the different two schemes.

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Efficient quantum dialogue without information leakage

Modern Physics Letters B ◽

10.1142/s0217984915500189 ◽

2015 ◽

Vol 29 (05) ◽

pp. 1550018 ◽

Cited By ~ 8

Author(s):

Ai-Han Yin ◽

Zhi-Hui Tang ◽

Dong Chen

Keyword(s):

Information Leakage ◽

W State ◽

Quantum Dialogue ◽

Dense Coding ◽

Quantum Dense Coding ◽

Channel Detection ◽

Secret Information ◽

Measurement Result

A two-step quantum dialogue scheme is put forward with a class of three-qubit W state and quantum dense coding. Each W state can carry three bits of secret information and the measurement result is encrypted without information leakage. Furthermore, we utilize the entangle properties of W state and decoy photon checking technique to realize three-time channel detection, which can improve the efficiency and security of the scheme.

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