A GENERALIZED CONDITION FOR TELEPORTATION OF THE QUANTUM STATE OF AN ASSEMBLY OF N TWO-LEVEL SYSTEM

2007 ◽  
Vol 21 (29) ◽  
pp. 2019-2023 ◽  
Author(s):  
HARI PRAKASH ◽  
NARESH CHANDRA ◽  
RANJANA PRAKASH ◽  
AMBESH DIXIT
Keyword(s):  
Quantum Information ◽  
Quantum State ◽  
Unitary Transformation ◽  
Bell State ◽  
Entangled State ◽  
Level System ◽  
Bell State Measurement ◽  
Original State ◽  
State Measurement ◽  
Two Level Systems

We consider the teleportation of quantum information consisting of the quantum state of a set S1 of N two-level systems (TLSs), using EPR entangled state consisting of set S2⊕S3 where set S2 has M TLSs and set S3 has N TLSs. The Bell state measurement is done on set S1⊕S2 and a unitary transformation, dependent on this result, on the quantum state of set S3 generates a replica of the original state of set S1. We show rigorously that the teleportation is possible only if M ≥ N.

SPLITTING QUANTUM INFORMATION WITH FIVE-ATOM ENTANGLED STATE IN CAVITY QED

2010 ◽  
Vol 08 (08) ◽  
pp. 1289-1299 ◽  
Author(s):  
XIAO-JIE YI ◽  
JIAN-MIN WANG ◽  
GUO-QIANG HUANG
Keyword(s):  
Quantum Information ◽  
Cavity Qed ◽  
Thermal Field ◽  
Bell State ◽  
Quantum Information Splitting ◽  
Entangled State ◽  
Bell State Measurement ◽  
State Measurement ◽  
Information Splitting

A realizable scheme is proposed for implementing quantum information splitting with five-atom entangled state in cavity QED, where we explicitly illustrate the procedure and analyze the security against the eavesdropping. The scheme does not involve Bell-state measurement and is insensitive to the cavity and the thermal field.

Realization of an economical phase-covariant telecloning in separate cavities

2012 ◽  
Vol 12 (3&4) ◽  
pp. 334-345
Author(s):  
Bao-Long Fang ◽  
Tao Wu ◽  
Liu Ye
Keyword(s):  
Quantum Information ◽  
Bell State ◽  
Entangled State ◽  
Bell State Measurement ◽  
State Measurement ◽  
Photon Pulse ◽  
Separate Cavities

We present a scheme to realize an economical $1 \to 2$ phase-covariant telecloning in separate cavities. In the scheme, an entangled state between a photon pulse and the tapped atoms will be prepared through cavity-assisted interaction. Next, the Bell state measurement is execute on the photon pulse and a trapped atom or another photon pulse on which the quantum information is encoded. In this way, the system can provide symmetric (asymmetric) economical $1 \to 2$ phase-covariant telecloning.

Implementation of nonlocal Bell-state measurement and quantum information transfer with weak Kerr nonlinearity

2011 ◽  
Vol 20 (12) ◽  
pp. 120307 ◽  
Author(s):  
Juan Bai ◽  
Qi Guo ◽  
Liu-Yong Cheng ◽  
Xiao-Qiang Shao ◽  
Hong-Fu Wang ◽  
...  
Keyword(s):  
Quantum Information ◽  
Information Transfer ◽  
Bell State ◽  
Kerr Nonlinearity ◽  
Bell State Measurement ◽  
State Measurement

SECRET SHARING OF N-ATOM ENTANGLED STATE IN CAVITY QED

2007 ◽  
Vol 18 (03) ◽  
pp. 343-349 ◽  
Author(s):  
ZHONG-XIAO MAN ◽  
YUN-JIE XIA ◽  
ZHAN-JUN ZHANG
Keyword(s):  
Secret Sharing ◽  
Cavity Qed ◽  
Thermal Field ◽  
Bell State ◽  
Entangled State ◽  
Quantum Channels ◽  
Driven Cavity ◽  
Bell State Measurement ◽  
State Measurement ◽  
Cavity Decay

We propose a scheme to secret sharing of an unknown N-atom entangled state in driven cavity QED. The scheme needs only atomic Bell states as the quantum channels and joint Bell-state measurement is unnecessary. In addition, the scheme is insensitive to the cavity decay and the thermal field.

THE TELEPORTATION OF AN ARBITRARY TWO-ATOM ENTANGLED STATE IN DRIVEN CAVITY QED

2007 ◽  
Vol 05 (03) ◽  
pp. 359-366 ◽  
Author(s):  
CHUAN-JIA SHAN ◽  
ZHONG-XIAO MAN ◽  
YUN-JIE XIA ◽  
TANG-KUN LIU
Keyword(s):  
Cavity Qed ◽  
Thermal Field ◽  
Bell State ◽  
Ghz State ◽  
Entangled State ◽  
Driven Cavity ◽  
Bell State Measurement ◽  
State Measurement ◽  
Cavity Decay ◽  
Probability Of Success

We propose a scheme for the teleportation of an arbitrary two-atom entangled state |ϕ〉12 = a|gg〉12 + b|ge〉12 + c|eg〉12 + d|ee〉12 in driven QED. Two pairs of maximally two-atom entangled state are required as the quantum channel. This scheme does not involve apparent (or direct) Bell-state measurement and is insensitive to the cavity decay and the thermal field. Meanwhile this approach can be used to teleport the unknown multipartite GHZ state. The probability of success in our scheme can reach 1.0.

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.

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