scholarly journals High-fidelity frequency down-conversion of visible entangled photon pairs with superconducting single-photon detectors

2014 ◽  
Author(s):  
Rikizo Ikuta ◽  
Hiroshi Kato ◽  
Yoshiaki Kusaka ◽  
Shigehito Miki ◽  
Taro Yamashita ◽  
...  
Keyword(s):  
Single Photon ◽  
High Fidelity ◽  
Photon Detectors ◽  
Photon Pairs ◽  
Single Photon Detectors ◽  
Entangled Photon Pairs ◽  
Down Conversion

scholarly journals Characterization of fiber-generated entangled photon pairs with superconducting single-photon detectors

2007 ◽  
Vol 15 (3) ◽  
pp. 1322 ◽  
Author(s):  
Chuang Liang ◽  
Kim F. Lee ◽  
Milja Medic ◽  
Prem Kumar ◽  
Robert H. Hadfield ◽  
...  
Keyword(s):  
Single Photon ◽  
Photon Detectors ◽  
Photon Pairs ◽  
Single Photon Detectors ◽  
Entangled Photon Pairs

Ti/Au TES AS SUPERCONDUCTING DETECTOR FOR QUANTUM TECHNOLOGIES

2011 ◽  
Vol 09 (supp01) ◽  
pp. 405-413 ◽  
Author(s):  
L. LOLLI ◽  
G. BRIDA ◽  
I. P. DEGIOVANNI ◽  
M. GRAMEGNA ◽  
E. MONTICONE ◽  
...  
Keyword(s):  
Single Photon ◽  
Transition Edge Sensor ◽  
Photon Counting ◽  
Single Photons ◽  
Photon Detectors ◽  
Preliminary Measurement ◽  
Transition Edge ◽  
Visible Wavelength Range ◽  
Single Photon Detectors ◽  
Down Conversion

Single photon detectors are fundamental tools for quantum metrology, e.g. to calibrate both detectors and sources, as for quantum information. One of the most promising detectors able to resolve single photons is the transition-edge sensor (TES). We report our last results obtained with Ti/Au TES deposited on SiN substrate. Photon counting measurements, obtained by using pulsed sources, in the NIR-visible wavelength range, show the ability to resolve up to fourteen photons with an energy resolution of 0.44 eV at 690 nm (1.80 eV) and 0.38 eV at 1310 nm (0.95 eV), with a good linearity. A preliminary measurement obtained by using a parametric down conversion (PDC) heralded single photon source, at 812 nm (1.53 eV), is also reported.

scholarly journals Spectrally multiplexed and ultrabright entangled photon pairs in a lithium niobate microresonator

2021 ◽  
Author(s):  
Bo-Yu Xu ◽  
Li-Kun Chen ◽  
Jintian Lin ◽  
Lan-Tian Feng ◽  
Rui Niu ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Single Photon ◽  
Phase Matching ◽  
Quantum Networks ◽  
Broad Bandwidth ◽  
Photon Pairs ◽  
Parametric Down Conversion ◽  
Entangled Photon Pairs ◽  
On Chip ◽  
Down Conversion

Abstract On-chip bright quantum sources with multiplexing ability are extremely high in demand for the integrated quantum networks with unprecedented scalability and complexity. Here, we demonstrate an ultrabright and broadband biphoton quantum source generated in a lithium niobate microresonator system. Without introducing the conventional domain poling, the on-chip microdisk produces entangled photon pairs covering a broad bandwidth promised by natural phase matching in spontaneous parametric down conversion. Experimentally, the multiplexed photon pairs are characterized by 30 nm bandwidth limited by the filtering system, which can be furthered enlarged. Meanwhile, the generation rate reaches 5.13 MHz/μW with a coincidence-to- accidental ratio up to 804. Besides, the quantum source manifests the prominent purity with heralded single photon correlation g(2)H(0)=0.0098±0.0021 and energy-time entanglement with excellent interference visibility of 96.5%±1.9%.

Calibration on the detection efficiency of the Si-APD and InGaAs-APD single-photon detectors by correlated photon pairs

2017 ◽  
Author(s):  
Xueshun Shi ◽  
Kun Zhao ◽  
Changming Liu ◽  
Haidong Chen ◽  
Kunfeng Chen ◽  
...  
Keyword(s):  
Detection Efficiency ◽  
Single Photon ◽  
Photon Detectors ◽  
Photon Pairs ◽  
Single Photon Detectors
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