Protecting an EPR state by quantum engineering of decoherence

2011 ◽  
Author(s):  
Russell Bloomer ◽  
Matthew Pysher ◽  
Olivier Pfister ◽  
Timothy Ralph ◽  
Ping Koy Lam
Keyword(s):  
Epr State

scholarly journals On Amplification of Light in the Continuous EPR State

2003 ◽  
Vol 01 (02) ◽  
pp. 207-215 ◽  
Author(s):  
V. N. Gorbachev ◽  
A. I. Trubilko
Keyword(s):  
Quantum Correlations ◽  
Continuous Variable ◽  
The Other ◽  
Atomic Ensemble ◽  
Transparent Medium ◽  
Integrals Of Motion ◽  
Squeezed Light ◽  
Type Interaction ◽  
Epr State

Two schemes of amplification of two-mode squeezed light in the continuous variable EPR-state are considered. They are based on the integrals of motion, which allow conserving quantum correlations whereas the power of each mode may increase. One of these schemes involves a three-photon parametric process in a nonlinear transparent medium and the other is a Raman type interaction of light with atomic ensemble. A generalization to multimode squeezed light is discussed.

DYNAMIC PROPERTIES OF THE LARGE-DETUNING CAVITY QED SYSTEM IN THE PRESENCE OF CAVITY DECAY

2008 ◽  
Vol 22 (26) ◽  
pp. 2561-2570
Author(s):  
CHENG-YUAN GAO ◽  
LEI MA ◽  
JIN-MING LIU
Keyword(s):  
Cavity Qed ◽  
Dynamic Properties ◽  
Photon Number ◽  
Quantum Phase Gate ◽  
Cavity Decay ◽  
Phase Gate ◽  
Physical Quantities ◽  
Population Probability ◽  
Average Photon Number ◽  
Epr State

We consider a physical process of two Λ-type three-level atoms interacting with a bimodal cavity including the influence of the cavity decay. We analyze the influence of cavity decay on several physical quantities of the process, such as atomic population probability, residual entanglement, concurrence of two atoms, average population inversion, average photon number, the fidelity for quantum phase gate, and the fidelity of generating atomic EPR state. It is found that all of these physical quantities decrease with the increase of cavity decay when the other relevant parameters are fixed.

scholarly journals WITNESSING ENTANGLEMENT OF EPR STATES WITH SECOND-ORDER INTERFERENCE

2006 ◽  
Vol 20 (11n13) ◽  
pp. 1504-1512 ◽  
Author(s):  
MAGDALENA STOBIŃSKA ◽  
KRZYSZTOF WÓDKIEWICZ
Keyword(s):  
Experimental Test ◽  
Continuous Variable ◽  
Second Order ◽  
Time Resolved ◽  
Quantum Nature ◽  
Epr State

The separability of the continuous-variable EPR state can be tested with Hanbury-Brown and Twiss type interference. The second-order visibility of such interference can provide an experimental test of entanglement. It is shown that time-resolved interference leads to the Hong, Ou and Mandel deep, that provides a signature of quantum non-separability for pure and mixed EPR states. A Hanbury-Brown and Twiss type witness operator can be constructed to test the quantum nature of the EPR entanglement.

REPLY TO: "ON COHEN'S CLASSICAL TELEPORTATION OF CLASSICAL STATES"

2006 ◽  
Vol 06 (03) ◽  
pp. C31-C32
Author(s):  
OLIVER COHEN
Keyword(s):  
Quantum Teleportation ◽  
Quantum States ◽  
Epr State ◽  
Classical States

In response to a recently published protocol for classical teleportation of classical states [1], Hrasko [2] has made some remarks in connection with the impossibility of precise quantum teleportation if a classical mixture is used in place of the EPR state, and with regard to the epistemological interpretation of quantum states. The purpose of this note is to attempt to clarify these issues and their relevance for the argumentation presented in [1].

A TWO-STEP CHANNEL-ENCRYPTING QUANTUM KEY DISTRIBUTION PROTOCOL

2010 ◽  
Vol 08 (06) ◽  
pp. 1013-1022 ◽  
Author(s):  
FEN-ZHUO GUO ◽  
FEI GAO ◽  
QIAO-YAN WEN ◽  
FU-CHEN ZHU
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Entangled States ◽  
Ideal Condition ◽  
Practical Situation ◽  
Information Carrier ◽  
General Individual Attack ◽  
Epr State ◽  
Quantum Key Distribution Protocol ◽  
Individual Attack

A two-step channel-encrypting quantum key distribution protocol is proposed. Using the previously shared EPR pairs as the quantum key, two bits of classical key can be established via one information carrier EPR state on average. In theory, the efficiency of this protocol reaches 100%, and there is no need to consume any entangled states including both the quantum key and the information carriers in ideal condition. The protocol can resist the particular attack that is fatal to other some channel-encrypting schemes. Principally, we prove the security against the most general individual attack of this protocol. Entanglement collapse in practical situation, as well as the realistic implementation of this protocol is also discussed.

scholarly journals Fiber-coupled EPR-state generation using a single temporally multiplexed squeezed light source

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Mikkel V. Larsen ◽  
Xueshi Guo ◽  
Casper R. Breum ◽  
Jonas S. Neergaard-Nielsen ◽  
Ulrik L. Andersen
Keyword(s):  
Light Source ◽  
Squeezed Light ◽  
State Generation ◽  
Epr State

Preparing a GHZ state, or an EPR state, with the one-atom maser

2000 ◽  
Vol 179 (1-6) ◽  
pp. 283-288 ◽  
Author(s):  
Berthold-Georg Englert ◽  
Herbert Walther
Keyword(s):  
Ghz State ◽  
The One ◽  
Epr State

EFFICIENT SCHEME FOR EPR STATE AND CLUSTER STATES GENERATION WITH SQUID QUBITS VIA RAMAN TRANSITION

2007 ◽  
Vol 21 (17) ◽  
pp. 1057-1064 ◽  
Author(s):  
ZHI-MING ZHAN
Keyword(s):  
Excited State ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Cavity Field ◽  
Raman Transition ◽  
Cluster States ◽  
Cavity Decay ◽  
Efficient Scheme ◽  
Epr State ◽  
Squid System

In this paper, a theoretical scheme is proposed to generate the EPR state of two SQUID qubits and create the multipartite cluster states of many SQUID qubits in cavity via Raman transition. We also show how to transfer quantum information from one SQUID qubit to another directly. In this scheme, the cavity field is only virtually excited and thus the cavity decay is suppressed. The quantum information processing and cluster states generation are realized by using only two lower flux states of the SQUID system and the excited state would not be excited. Therefore, the effect of decoherence caused from the levels of the SQUID system is possibly minimized.

Probabilistic cloning and orthogonal complementing of an unknown EPR state

2005 ◽  
Vol 354 ◽  
pp. 220-226 ◽  
Author(s):  
Chao Han ◽  
Wei Song ◽  
Ming Yang ◽  
Zhuo-Liang Cao
Keyword(s):  
Epr State
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