Adding a single photon to a coherent state

2014 ◽  
Vol 64 (8) ◽  
pp. 1230-1233 ◽  
Author(s):  
Seokhyun Jang ◽  
Kisik Kim
Keyword(s):  
Coherent State ◽  
Single Photon

Entanglement and nonlocality for a mixture of a pair-coherent state

2003 ◽  
Vol 3 (2) ◽  
pp. 106-115
Author(s):  
S. Mancini ◽  
P. Tombesi
Keyword(s):  
Coherent State ◽  
Quantum Teleportation ◽  
Single Photon ◽  
Continuous Variables ◽  
Bell’S Inequalities ◽  
Nonclassical Properties ◽  
Pair Coherent State ◽  
Photon Loss ◽  
Phase Randomization ◽  
Degree Of Entanglement

We consider a bipartite continuous variables quantum mixture coming from phase randomization of a pair-coherent state. We study the nonclassical properties of such a mixture. In particular, we quantify its degree of entanglement, then we show possible violations of Bell's inequalities. We also consider the use of this mixture in quantum teleportation. Finally, we compare this mixture with that obtained from a pair-coherent state by single photon loss.

Single photon emission based on coherent state preparation

2007 ◽  
Vol 91 (11) ◽  
pp. 111110 ◽  
Author(s):  
P. Ester ◽  
L. Lackmann ◽  
S. Michaelis de Vasconcellos ◽  
M. C. Hübner ◽  
A. Zrenner ◽  
...  
Keyword(s):  
Coherent State ◽  
Single Photon ◽  
Photon Emission ◽  
Single Photon Emission ◽  
State Preparation

Nonclassicality and entanglement of single-photon catalysis-assisted two-mode squeezed coherent state

2020 ◽  
Vol 474 ◽  
pp. 126103 ◽  
Author(s):  
Wei Ye ◽  
Huan Zhang ◽  
Chaoping Wei ◽  
Hai Zhong ◽  
Ying Xia ◽  
...  
Keyword(s):  
Coherent State ◽  
Single Photon ◽  
Squeezed Coherent State

Unconditional Conversion between a Single-Photon State and a Coherent-State Superposition via Squeezing Operation

2012 ◽  
Author(s):  
Yoshichika Miwa ◽  
Jun-ichi Yoshikawa ◽  
Noriaki Iwata ◽  
Mamoru Endo ◽  
Petr Marek ◽  
...  
Keyword(s):  
Coherent State ◽  
Single Photon ◽  
Photon State ◽  
Single Photon State

SECURITY OF QUANTUM KEY DISTRIBUTION WITH STRONG PHASE-REFERENCE PULSE

2005 ◽  
Vol 03 (supp01) ◽  
pp. 75-86
Author(s):  
MASATO KOASHI
Keyword(s):  
Coherent State ◽  
Quantum Key Distribution ◽  
Single Photon ◽  
Key Distribution ◽  
Secret Key ◽  
Single Photon Source ◽  
Reference Pulse ◽  
High Loss ◽  
The One ◽  
Photon Source

In the BB84 protocol with a perfect single photon source, the key rate decreases linearly with the transmission η of the channel. If we simply replace this source with a weak coherent-state pulse, the key rate drops more rapidly (as O(η2)) since the presence of multiple photons favors the eavesdropper. Here we discuss the unconditional security of a quantum key distribution protocol in which bit values are encoded in the phase of a weak coherent-state pulse relative to a strong reference pulse, which is essentially the one proposed by Bennett in 1992 (the B92 scheme). We show that in the limit of high loss in the transmission channel, we can construct a secret key with a rate proportional to the transmission η of the channel.

Experimental hybrid entanglement between quantum and classical states of light

2014 ◽  
Vol 12 (07n08) ◽  
pp. 1560015 ◽  
Author(s):  
Luca S. Costanzo ◽  
Alessandro Zavatta ◽  
Samuele Grandi ◽  
Marco Bellini ◽  
Hyunseok Jeong ◽  
...  
Keyword(s):  
Quantum Information ◽  
Coherent State ◽  
Single Photon ◽  
Classical System ◽  
Important Milestone ◽  
Classical States

The realization of hybrid entanglement between a microscopic (quantum) and a macroscopic (classical) system, in analogy to the situation of the famous Schrödinger's cat paradox, is an important milestone, both from the fundamental perspective and for possible applications in the processing of quantum information. The most straightforward optical implementation of this condition is that of the entanglement between a single-photon and a coherent state. In this work, we describe the first step towards the generation of this type of hybrid entanglement from the experimental perspective.

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