BIDIRECTIONAL QUANTUM SECURE DIRECT COMMUNICATION IN DRIVEN CAVITY QED

2009 ◽  
Vol 23 (27) ◽  
pp. 3225-3234 ◽  
Author(s):  
CHUAN-JIA SHAN ◽  
JI-BING LIU ◽  
WEI-WEN CHENG ◽  
TANG-KUN LIU ◽  
YAN-XIA HUANG ◽  
...  
Keyword(s):  
Cavity Qed ◽  
Thermal Field ◽  
Success Probability ◽  
Bell State ◽  
Quantum Secure Direct Communication ◽  
Entanglement Swapping ◽  
Direct Communication ◽  
Driven Cavity ◽  
Cavity Decay ◽  
Probability Of Success

A theoretical scheme of bidirectional quantum secure direct communication is proposed in the context of driven cavity QED. We first present an entanglement swapping scheme in cavities where two atoms without previous interaction can be entangled with a success probability of unity. Then, based on a novel property of entanglement swapping, we propose a bidirectional quantum secure direct communication protocol, in which two legitimate users can exchange their different secret messages simultaneously in a direct way. The probability of success in our scheme is 1.0. This scheme does not involve apparent (or direct) Bell-state measurements and 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.

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.

IMPLEMENTING ENTANGLEMENT SWAPPING WITH A THERMAL CAVITY

2007 ◽  
Vol 05 (06) ◽  
pp. 837-843 ◽  
Author(s):  
ZHI HE ◽  
CHAO-YUN LONG ◽  
SHUI-JIE QIN ◽  
GAO-FENG WEI
Keyword(s):  
Cavity Qed ◽  
Thermal Field ◽  
Success Probability ◽  
Entanglement Swapping ◽  
Cavity Decay

We proposed a scheme to implement the entanglement swapping based on cavity QED. Using this scheme, we can obtain the entanglement swapping with the success probability of 100% for a two atoms system and a three atoms system respectively, and the entanglement swapping is insensitive to both the cavity decay and thermal field.

scholarly journals SCHEME FOR BELL-STATE-MEASUREMENT-FREE QUANTUM TELEPORTATION

2006 ◽  
Vol 04 (02) ◽  
pp. 341-346 ◽  
Author(s):  
MING YANG ◽  
ZHUO-LIANG CAO
Keyword(s):  
Quantum Teleportation ◽  
Cavity Qed ◽  
Thermal Field ◽  
Success Probability ◽  
Bell State ◽  
Bell State Measurement ◽  
State Measurement ◽  
Cavity Decay ◽  
Atomic States

A teleportation scheme for unknown atomic states is proposed in cavity QED. The Bell state measurement is not needed in the teleportation process, and the success probability can reach 1.0. In addition, the current scheme is insensitive to the cavity decay and thermal field.

EFFICIENT TELEPORTATION OF UNKNOWN ATOMIC ENTANGLED STATES

2006 ◽  
Vol 04 (04) ◽  
pp. 627-631 ◽  
Author(s):  
YAN ZHAO ◽  
MING YANG ◽  
ZHUO-LIANG CAO
Keyword(s):  
Cavity Qed ◽  
Thermal Field ◽  
Photon Number ◽  
Success Probability ◽  
Bell State ◽  
Classical Field ◽  
Entangled States ◽  
Effective Hamiltonian ◽  
State Measurement ◽  
Cavity Decay

We propose a scheme for teleporting unknown atomic entangled states in cavity QED. With the assistance of a strong classical field, the photon number dependent parts in the effective Hamiltonian are canceled. Thus, the scheme is insensitive to both the cavity decay and the thermal field. In addition, our scheme does not require the Bell-state measurement directly and the success probability can reach 1.0 in our scheme.

ENTANGLEMENT SWAPPING AND QUANTUM COMMUNICATION IN CAVITY QED

2008 ◽  
Vol 06 (06) ◽  
pp. 1255-1262 ◽  
Author(s):  
CHUAN-JIA SHAN ◽  
JI-BING LIU ◽  
WEI-WEN CHENG ◽  
TANG-KUN LIU ◽  
YAN-XIA HUANG ◽  
...  
Keyword(s):  
Cavity Qed ◽  
Quantum Communication ◽  
Communication Protocol ◽  
Success Probability ◽  
Entanglement Swapping ◽  
Direct Communication

We study entanglement swapping and quantum communication in the context of cavity QED. We first present an entanglement swapping scheme in cavities where two atoms without interacting previously can be entangled with the success probability unity. Then, conditioned on a novel property of entanglement swapping, we propose a secure direct communication protocol, in which two legitimate users can communicate deterministically.

PROBABILISTIC TELEPORTATION OF A TWO-ATOM ENTANGLED STATE IN CAVITY QED

2008 ◽  
Vol 22 (13) ◽  
pp. 2129-2137
Author(s):  
JIN-MING LIU ◽  
YI-CAI WANG ◽  
XIAO-QI XIAO
Keyword(s):  
Quantum Channel ◽  
Cavity Qed ◽  
Thermal Field ◽  
Cavity Mode ◽  
Resonant Cavity ◽  
Success Probability ◽  
Entangled State ◽  
Probabilistic Teleportation ◽  
Cavity Decay ◽  
Partially Entangled State

We present two schemes for probabilistically teleporting a two-atom entangled state using a three-atom partially entangled state as the quantum channel in cavity QED with the help of separate atomic measurements. The first scheme is only based on the interaction between two driven atoms and a quantized cavity mode in the large detuning limit, so the effects of both cavity decay and the thermal field are eliminated. In the second scheme, it is necessary to introduce an additional resonant cavity besides the thermal cavity to realize the teleportation, and the corresponding success probability is improved.

QUANTUM SECURE DIRECT COMMUNICATION WITH ONLY SEPARATE MEASUREMENTS IN DRIVEN CAVITY QED

2010 ◽  
Vol 08 (03) ◽  
pp. 457-464
Author(s):  
CHUAN-JIA SHAN ◽  
TAO CHEN ◽  
JI-BING LIU ◽  
TANG-KUN LIU ◽  
YAN-XIA HUANG ◽  
...  
Keyword(s):  
Quantum Electrodynamics ◽  
Cavity Qed ◽  
Resonant Cavity ◽  
Bell State ◽  
Quantum Secure Direct Communication ◽  
Single Mode ◽  
Cavity Quantum Electrodynamics ◽  
Direct Communication ◽  
Legitimate User ◽  
Communication Processes

An experimentally feasible new scheme for quantum secure direct communication is proposed in cavity quantum electrodynamics without apparent joint Bell-state measurement. The legitimate user can receive different secret messages in a direct way through Einstein–Podolsky–Rosen (EPR) pairs, the probability of the success in our scheme is unity. In the communication processes, the interactions between atoms and a single-mode non-resonant cavity with the assistance of a strong classical driving field substitute the joint measurements. Hence, this scheme needs only separate measurements. In addition, the scheme is insensitive to the cavity decay and the thermal field. The discussion of the scheme indicates that it can be realized based on current technologies.

EFFICIENT SCHEME FOR TELEPORTATION OF UNKNOWN ATOMIC STATES USING NON-MAXIMALLY ENTANGLED STATES

2007 ◽  
Vol 21 (15) ◽  
pp. 923-927
Author(s):  
KUANG-WEI XIONG
Keyword(s):  
Cavity Qed ◽  
Bell State ◽  
Atomic State ◽  
Entangled States ◽  
Distinct Advantage ◽  
State Measurement ◽  
Cavity Decay ◽  
Efficient Scheme ◽  
Maximally Entangled States ◽  
Atomic States

We propose a feasible scheme for teleporting an unknown atomic state by using non-maximally entangled states in cavity QED. The distinct advantage of the scheme is that, not only can the teleportation and distillation procedure be realized simultaneously, but the scheme is also insensitive to the cavity decay and thermal field with the assistance of a strong classical driving field. In addition, the joint Bell-state measurement can be distinguished via detecting the atomic state.

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