scholarly journals Quantum-dot single-photon sources: Prospects for applications in linear optics quantum-information processing

2004 ◽  
Vol 69 (3) ◽  
Author(s):  
A. Kiraz ◽  
M. Atatüre ◽  
A. Imamoğlu
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Dot ◽  
Quantum Information Processing ◽  
Single Photon ◽  
Linear Optics ◽  
Photon Sources

EXPLORING A NEW POST-SELECTION CONDITION FOR EFFICIENT LINEAR OPTICS COMPUTATION

2005 ◽  
Vol 03 (04) ◽  
pp. 611-621
Author(s):  
RUBEN COEN CAGLI ◽  
PAOLO ANIELLO ◽  
NICOLA CESARIO ◽  
FRANCESCO FONCELLINO
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Upper Bound ◽  
Quantum Information Processing ◽  
Single Photon ◽  
Success Probability ◽  
Rigorous Proof ◽  
Linear Optics ◽  
Selection Condition ◽  
The One

Recently, it has been shown that fundamental gates for theoretically efficient quantum information processing can be realized by using single photon sources, linear optics and photon counters. One of these fundamental gates is the NS-gate, that is, the one-mode non-linear sign shift. In this work, firstly, we prove by an elementary and rigorous proof that the upper bound of success probability of NS-gates with only one helper photon and an undefined number of ancillary modes is bounded by 0.25. Secondly, we explore the upper bound of the success probability of the NS-gate with a new post-selection measurement. The idea behind this new post-selection measurement is to condition the success of NS-gate transformation to the observation of only one helper photon in whichever of the output modes.

Quantum dots as single-photon sources for quantum information processing

2005 ◽  
Vol 7 (7) ◽  
pp. S129-S134 ◽  
Author(s):  
D C Unitt ◽  
A J Bennett ◽  
P Atkinson ◽  
K Cooper ◽  
P See ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Single Photon ◽  
Photon Sources

scholarly journals Optical Chirality and Single-Photon Isolation

2020 ◽  
Author(s):  
Lei Tang ◽  
Keyu Xia
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Single Photon ◽  
Kerr Nonlinearity ◽  
Single Photons ◽  
Optical Isolation ◽  
Optical Chirality ◽  
Magneto Optical Effect ◽  
Quantum Optical

Optical isolation is important for protecting a laser from damage due to the detrimental back reflection of light. It typically relies on breaking Lorentz reciprocity and normally is achieved via the Faraday magneto-optical effect, requiring a strong external magnetic field. Single-photon isolation, the quantum counterpart of optical isolation, is the key functional component in quantum information processing, but its realization is challenging. In this chapter, we present all-optical schemes for isolating the backscattering from single photons. In the first scheme, we show the single-photon isolation can be realized by using a chiral quantum optical system, in which a quantum emitter asymmetrically couples to nanowaveguide modes or whispering-gallery modes with high optical chirality. Secondly, we propose a chiral optical Kerr nonlinearity to bypass the so-called dynamical reciprocity in nonlinear optics and then achieve room-temperature photon isolation with low insertion loss. The concepts we present may pave the way for quantum information processing in an unconventional way.

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