REMOTE INFORMATION CONCENTRATION VIA FOUR-PARTICLE CLUSTER STATE AND BY POSITIVE OPERATOR-VALUE MEASUREMENT

2013 ◽  
Vol 27 (18) ◽  
pp. 1350091 ◽  
Author(s):  
JIA-YIN PENG ◽  
MING-XING LUO ◽  
ZHI-WEN MO
Keyword(s):  
Quantum Information ◽  
Positive Operator ◽  
Quantum Channel ◽  
Cluster State ◽  
Projective Measurement ◽  
Particle Cluster ◽  
Single Qubit ◽  
Global Operations ◽  
Value Measurement ◽  
Positive Operator Valued Measure

By using a proper positive operator-valued measure (POVM), we present two new schemes for remote information concentration via four-particle cluster state. It is demonstrated that by employing a maximally entangled (respectively, nonmaximally entangled) four-particle cluster state as the quantum channel, quantum information initially and generally (respectively, specially) distributed in three spatially separated qubits can be remotely and probabilistically concentrated back to a single qubit without performing any global operations. Moreover, the total success probabilities of these two protocols are also worked out. It is more easier to realize experimentally by POVM than by projective measurement.

scholarly journals An efficient quantum teleportation of six-qubit state via an eight-qubit cluster state

2018 ◽  
Vol 96 (6) ◽  
pp. 650-653 ◽  
Author(s):  
Nan Zhao ◽  
Min Li ◽  
Nan Chen ◽  
Chang-xing Pei
Keyword(s):  
Quantum Channel ◽  
Quantum Teleportation ◽  
Cluster State ◽  
Qubit State ◽  
Particle State ◽  
Projective Measurement ◽  
Particle Cluster ◽  
Von Neumann ◽  
Original State ◽  
Intrinsic Efficiency

We present a scheme for teleporting a certain class of six-particle state via an eight-particle cluster state as quantum channel. In our scheme, the sender merely needs to perform an eight-particle von-Neumann projective measurement, and the receiver gives a corresponding general evolution to restore the original state. Our scheme is a deterministic scheme. Compared with other schemes proposed before, our scheme possesses higher intrinsic efficiency.

SYMMETRIC AND PROBABILISTIC MULTIPARTY REMOTE STATE PREPARATION VIA THE POSITIVE-OPERATOR-VALUED MEASURE

2009 ◽  
Vol 07 (05) ◽  
pp. 991-999 ◽  
Author(s):  
YI-MIN LIU ◽  
ZHANG-YIN WANG ◽  
XIAN-SONG LIU ◽  
ZHAN-JUN ZHANG
Keyword(s):  
Positive Operator ◽  
Qubit State ◽  
Remote State Preparation ◽  
The Other ◽  
Projective Measurement ◽  
State Preparation ◽  
Single Qubit ◽  
Prepared State ◽  
Positive Operator Valued Measure

We present a tripartite scheme for a preparer to remotely prepare an arbitrary single-qubit state in either distant ministrant's place by using a GHZ-type state. After the preparer's single-qubit state projective measurement, by performing a proper positive operator-valued measure, one ministrant can construct the preparer's state in a probabilistic manner with the other ministrant's assistance. Furthermore, we show that the remote state preparation can be achieved with a higher probability provided that the prepared state belongs to two special ensembles. Finally, we sketch the generalization of the tripartite scheme to a multiparty case.

REMOTE INFORMATION CONCENTRATION BY W STATE

2013 ◽  
Vol 27 (26) ◽  
pp. 1350137 ◽  
Author(s):  
JIA-YIN PENG ◽  
MING-QIANG BAI ◽  
ZHI-WEN MO
Keyword(s):  
Quantum Information ◽  
Quantum Channel ◽  
Bell State ◽  
W State ◽  
Unitary Operation ◽  
Bell State Measurement ◽  
Single Qubit ◽  
State Measurement ◽  
Global Operations ◽  
Peculiar Phenomenon

Employing the six-particle W state as the quantum channel in this paper, we investigate remote information concentration (RIC) which is the reverse process of the 1→5 optimal asymmetric economical phase-covariant telecloning (OAEPCT). To achieve the task, Bell state measurement and unitary operation are needed. It is shown that the quantum information initially distributed in five spatially separated qubits can be remotely and probabilistically concentrated back to a single qubit without performing any global operations. The result shows a peculiar phenomenon that the RIC is not always performed perfectly. It can be achieved with certain probability.

TELEPORTING AND SPLITTING ARBITRARY SINGLE-QUBIT INFORMATION USING A CLASS OF THREE-QUBIT W STATES

2009 ◽  
Vol 07 (07) ◽  
pp. 1349-1356 ◽  
Author(s):  
JIE YANG ◽  
YI-MIN LIU ◽  
XUE-QIN ZUO ◽  
ZHAN-JUN ZHANG
Keyword(s):  
Quantum Information ◽  
Quantum Channel ◽  
Quantum Teleportation ◽  
Quantum Information Splitting ◽  
Single Qubit ◽  
W States ◽  
Special Case ◽  
Information Splitting

Using a class of three-qubit W states as quantum channel, we present a quantum teleportation (QT) scheme and a quantum information splitting (QIS) scheme, respectively. We compare our schemes with two similar schemes proposed recently. It is found that our QT scheme reduces the operation difficulty in contrast to Agrawal and Pati's QT scheme [Phys. Rev. A74 (2006) 062320], and our QIS scheme is more applicable than Zheng's QIS scheme [Phys. Rev. A74 (2006) 054303] for the latter is only a special case of the former in some given conditions.

SCHEME FOR IMPLEMENTING ASSISTED CLONING OF AN UNKNOWN TWO-PARTICLE ENTANGLED STATE VIA CLUSTER STATE

2009 ◽  
Vol 23 (15) ◽  
pp. 3231-3239 ◽  
Author(s):  
PENG-CHENG MA ◽  
YOU-BANG ZHAN ◽  
LING-LING ZHANG
Keyword(s):  
Quantum Channel ◽  
Cluster State ◽  
Orthogonal Complement ◽  
Entangled State ◽  
Projective Measurement ◽  
Quantum Cloning ◽  
Second Stage ◽  
Unknown State

We present a scheme that can realize quantum cloning of an unknown two-particle entangled state and its orthogonal-complement state with assistance offered by a state preparer, via entangled cluster state as quantum channel. The first stage of the scheme requires usual teleportation via a maximally four-particle entangled cluster state as quantum channel. In the second stage of the scheme, with the assistance (through a two-particle projective measurement) of the preparer, the perfect copies and complement copies of an unknown two-particle entangled state can be obtained. We also put forward a scheme for the teleportation by using nonmaximally entangled quantum channel. The clones and complement clones of unknown state can be produced with certain probability in the latter scheme.

PROBABILISTIC REMOTELY PREPARING AN ARBITRARY TWO-PARTICLE ENTANGLED STATE VIA POSITIVE OPERATOR-VALUED MEASURE

2008 ◽  
Vol 06 (06) ◽  
pp. 1183-1193 ◽  
Author(s):  
KUI HOU ◽  
JING WANG ◽  
SHOU-HUA SHI
Keyword(s):  
Positive Operator ◽  
Cluster State ◽  
Success Probability ◽  
Remote State Preparation ◽  
Entangled State ◽  
Classical Communication ◽  
Maximally Entangled State ◽  
State Preparation ◽  
Projective Measurements ◽  
Positive Operator Valued Measure

By means of the method of the positive operator-valued measure, two schemes to remotely prepare an arbitrary two-particle entangled state were presented. The first scheme uses a one-dimensional four-particle non-maximally entangled cluster state while the second one uses two partially entangled two-particle states as the quantum channel. For both schemes, if Alice performs two-particle projective measurements and Bob adopts positive operator-valued measure, the remote state preparation can be successfully realized with certain probability. The success probability of the remote state preparation and classical communication cost are calculated. It is shown that Bob can obtain the unknown state with probability 1/4 for maximally entangled state. However, for four kinds of special states, the success probability of preparation can be enhanced to unity.

A new controlled quantum secure direct communication protocol based on a four-qubit cluster state

2014 ◽  
Vol 28 (24) ◽  
pp. 1450194 ◽  
Author(s):  
Meiling Wang ◽  
Wenping Ma ◽  
Dongsu Shen ◽  
Xunru Yin
Keyword(s):  
Quantum Channel ◽  
Quantum Teleportation ◽  
Communication Protocol ◽  
Cluster State ◽  
Security Analysis ◽  
Quantum Secure Direct Communication ◽  
Secret Message ◽  
Particle Cluster ◽  
Controlled Quantum Teleportation ◽  
Direct Communication

A new controlled quantum secure direct communication (CQSDC) protocol is presented by using a four-particle cluster state as quantum channel and the physical characteristics of controlled quantum teleportation to implement the transmission and the control. In this scheme, the receiver can receive the secret message from the sender and recover the secret message under the permission of the controller. According to the security analysis, the communication is secure against both participant and outside attacks, so this CQSDC protocol is secure and feasible.

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