Indistinguishability of Temporally Separated Pairwise Two- Photon State of Thermal Photons in Franson-Type Interferometry

2021 ◽  
Author(s):  
Jiho Park ◽  
Heonoh Kim ◽  
Han Seb Moon
Keyword(s):  
Time Delay ◽  
Coherence Length ◽  
Interference Fringe ◽  
Single Photon ◽  
Atomic Ensemble ◽  
Temporal Separation ◽  
Photon State ◽  
Two Photon ◽  
Novel Method ◽  
Entangled Photon Pairs

Abstract The phenomenon of Franson interference with time–energy entangled photon pairs beyond the single-photon coherence length observed upon nonlocal measurement at two space-like separated locations is of particular research interest. Herein, we determine the coherence length of temporally separated pairwise two-photon (TSPT) states of thermal photons emitted from a warm atomic ensemble in Franson-type interferometry, with the setup consisting of two spatially separated unbalanced Michelson interferometers beyond the coherence length of a thermal photon. Using a novel method of square-modulated thermal photons, we show that the sinusoidal Franson-type interference fringe of thermal photons is determined by the presence or absence of TSPT states (corresponding to the time delay between the long and short paths in Franson-type interferometry). We find that the indistinguishability of the TSPT state in the Franson-type interference is independent of the temporal separation of the thermal photons in the TSPT states.

GENERATION OF MULTIPHOTON POLARIZATION-ENTANGLED CLUSTER STATES AND THE CORRESPONDING OPEN-DESTINATION TELEPORTATION

2008 ◽  
Vol 22 (32) ◽  
pp. 3145-3152 ◽  
Author(s):  
DI CHANG ◽  
YONG-CHANG HUANG
Keyword(s):  
Single Photon ◽  
Schematic Diagram ◽  
Optical Elements ◽  
Cluster States ◽  
Photon State ◽  
Beam Splitters ◽  
Two Photon ◽  
Single Photon State ◽  
Half Wave ◽  
Linear Optical Elements

We propose a method to generate multiphoton polarization-entangled cluster states of any number photons by using the fusion operations of two-photon cluster states and a kind of local operation, and then analyze the process of open-destination teleportation of a single photon state using the generated states. Apart from theoretical deductions, we also give the experimentally schematic diagram, which requires only BBOs, Polarization Beam Splitters, half-wave plates, single photon resources as well as some other linear optical elements. The equipment and techniques used here are all feasible under current technology.

Transverse coherence length of down-converted light in the two-photon state

1999 ◽  
Vol 59 (2) ◽  
pp. 1608-1614 ◽  
Author(s):  
E. J. S. Fonseca ◽  
C. H. Monken ◽  
S. Pádua ◽  
G. A. Barbosa
Keyword(s):  
Coherence Length ◽  
Photon State ◽  
Two Photon

scholarly journals Quantum discord of thermal two-photon orbital angular momentum state: mimicking teleportation to transmit an image

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Lixiang Chen
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Quantum Discord ◽  
Single Photon ◽  
Image Transmission ◽  
Quantum Correlations ◽  
Optical Image ◽  
Photon State ◽  
Two Photon ◽  
Angular Momentum State

AbstractWe formulate a density matrix to fully describe two-photon state within a thermal light source in the photon orbital angular momentum (OAM) Hilbert space. We prove the separability, i.e., zero entanglement of the thermal two-photon state. Still, we reveal the hidden quantum correlations in terms of geometric measures of discord. By mimicking the original protocol of quantum teleportation, we demonstrate that the non-zero quantum discord can be utilized to transmit a high-dimensional OAM state at the single-photon level. It is found that albeit the low fidelity of teleportation due to the inherent component of maximally mixed state, the information of all parameters that characterize the original state can still be extracted from the teleported one. Besides, we demonstrate that the multiple repetitions of the protocol, enable the transmission of a complex-amplitude light field, e.g., an optical image, regardless of being accompanied with a featureless background. We also distinguish our scheme of optical image transmission from that of ghost imaging.

Picosecond Single-Photon and Femtosecond Two-Photon Pulsed Laser Stimulation for IC Characterization and Failure Analysis

2009 ◽  
Author(s):  
V. Pouget ◽  
E. Faraud ◽  
K. Shao ◽  
S. Jonathas ◽  
D. Horain ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Single Photon ◽  
Pulsed Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Laser Stimulation ◽  
Two Photon ◽  
Resolution Improvement ◽  
Ultrashort Laser

Abstract This paper presents the use of pulsed laser stimulation with picosecond and femtosecond laser pulses. We first discuss the resolution improvement that can be expected when using ultrashort laser pulses. Two case studies are then presented to illustrate the possibilities of the pulsed laser photoelectric stimulation in picosecond single-photon and femtosecond two-photon modes.

scholarly journals Wafer-Scale Epitaxial Low Density InAs/GaAs Quantum Dot for Single Photon Emitter in Three-Inch Substrate

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 930
Author(s):  
Xiaoying Huang ◽  
Rongbin Su ◽  
Jiawei Yang ◽  
Mujie Rao ◽  
Jin Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Single Photon ◽  
Growth Parameters ◽  
Life Time ◽  
Correlation Factor ◽  
Low Density ◽  
Wafer Scale ◽  
Two Photon ◽  
Gaas Quantum Dot ◽  
Highly Uniform

In this work, we successfully achieved wafer-scale low density InAs/GaAs quantum dots (QDs) for single photon emitter on three-inch wafer by precisely controlling the growth parameters. The highly uniform InAs/GaAs QDs show low density of μ0.96/μm2 within the radius of 2 cm. When embedding into a circular Bragg grating cavity on highly efficient broadband reflector (CBR-HBR), the single QDs show excellent optoelectronic properties with the linewidth of 3± 0.08 GHz, the second-order correlation factor g2(τ)=0.0322 ±0.0023, and an exciton life time of 323 ps under two-photon resonant excitation.

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