On-Demand Photon-Number State Generation via Cavity Parametric Down Conversion

2006 ◽  
Author(s):  
Alex Hayat ◽  
Meir Orenstein
Keyword(s):  
Photon Number ◽  
On Demand ◽  
Number State ◽  
Parametric Down Conversion ◽  
State Generation ◽  
Down Conversion

scholarly journals Quantum-enhanced interferometry with large heralded photon-number states

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
G. S. Thekkadath ◽  
M. E. Mycroft ◽  
B. A. Bell ◽  
C. G. Wade ◽  
A. Eckstein ◽  
...  
Keyword(s):  
Photon Number ◽  
Optical Loss ◽  
High Gain ◽  
Phase Sensitivity ◽  
Entangled Photons ◽  
Fundamental Limits ◽  
Parametric Down Conversion ◽  
Photonic States ◽  
Quantum Phenomena ◽  
Down Conversion

Abstract Quantum phenomena such as entanglement can improve fundamental limits on the sensitivity of a measurement probe. In optical interferometry, a probe consisting of N entangled photons provides up to a $$\sqrt{N}$$ N enhancement in phase sensitivity compared to a classical probe of the same energy. Here, we employ high-gain parametric down-conversion sources and photon-number-resolving detectors to perform interferometry with heralded quantum probes of sizes up to N = 8 (i.e. measuring up to 16-photon coincidences). Our probes are created by injecting heralded photon-number states into an interferometer, and in principle provide quantum-enhanced phase sensitivity even in the presence of significant optical loss. Our work paves the way toward quantum-enhanced interferometry using large entangled photonic states.

scholarly journals Non-classical Signature of Parametric Fluorescence and its Application in Metrology

2014 ◽  
Vol 14 (4) ◽  
pp. 227-236 ◽  
Author(s):  
M. Hamar ◽  
V. Michálek ◽  
A. Pathak
Keyword(s):  
Numerical Simulations ◽  
Photon Number ◽  
Theoretical Background ◽  
Iccd Camera ◽  
Parametric Down Conversion ◽  
Light Beams ◽  
Down Conversion ◽  
Theoretical Results ◽  
Multimode Beams

Abstract The article provides a short theoretical background of what the non-classical light means. We applied the criterion for the existence of non-classical effects derived by C.T. Lee on parametric fluorescence. The criterion was originally derived for the study of two light beams with one mode per beam. We checked if the criterion is still working for two multimode beams of parametric down-conversion through numerical simulations. The theoretical results were tested by measurement of photon number statistics of twin beams emitted by nonlinear BBO crystal pumped by intense femtoseconds UV pulse. We used ICCD camera as the detector of photons in both beams. It appears that the criterion can be used for the measurement of the quantum efficiencies of the ICCD cameras.

Photon-number-state generation with a single two-level atom in a cavity: a proposal

1998 ◽  
Vol 1 (1) ◽  
pp. 1 ◽  
Author(s):  
P. Domokos ◽  
M. Brune ◽  
J.M. Raimond ◽  
J.M. Raimond ◽  
S. Haroche
Keyword(s):  
Photon Number ◽  
Level Atom ◽  
Number State ◽  
State Generation

scholarly journals Reducing $g^{(2)}(0)$ of a parametric down-conversion source via photon-number resolution with superconducting nanowire detectors

2022 ◽  
Author(s):  
Santiago Sempere-Llagostera ◽  
Guillaume Thekkadath ◽  
Raj Patel ◽  
W Steven Kolthammer ◽  
Ian Walmsley
Keyword(s):  
Photon Number ◽  
Parametric Down Conversion ◽  
Down Conversion ◽  
Superconducting Nanowire

Photon-number state on-demand source by cavity parametric downconversion

2006 ◽  
Vol 89 (17) ◽  
pp. 171108 ◽  
Author(s):  
Alex Hayat ◽  
Meir Orenstein
Keyword(s):  
Photon Number ◽  
On Demand ◽  
Number State

Metalens-array–based high-dimensional and multiphoton quantum source

Science ◽  
2020 ◽  
Vol 368 (6498) ◽  
pp. 1487-1490 ◽  
Author(s):  
Lin Li ◽  
Zexuan Liu ◽  
Xifeng Ren ◽  
Shuming Wang ◽  
Vin-Cent Su ◽  
...  
Keyword(s):  
Nonlinear Crystal ◽  
High Dimensional ◽  
Two Photon ◽  
Parametric Down Conversion ◽  
State Generation ◽  
Quantum Optical ◽  
Photon Generation ◽  
Down Conversion ◽  
Photon Source ◽  
Photon Path

The development of two-dimensional metasurfaces has shown great potential in quantum-optical technologies because of the excellent flexibility in light-field manipulation. By integrating a metalens array with a nonlinear crystal, we demonstrate a 100-path spontaneous parametric down-conversion photon-pair source in a 10 × 10 array, which shows promise for high-dimensional entanglement and multiphoton-state generation. We demonstrate two-, three- and four-dimensional two-photon path entanglement with different phases encoded by metalenses with fidelities of 98.4, 96.6, and 95.0%, respectively. Furthermore, four-photon and six-photon generation is observed with high indistinguishability of photons generated from different metalenses. Our metalens-array–based quantum photon source is compact, stable, and controllable, indicating a new platform for integrated quantum devices.

Triggering parametric-down conversion-based quantum key distribution via radiation field

2020 ◽  
Vol 18 (06) ◽  
pp. 2050037
Author(s):  
Tchoffo Martin ◽  
Tene Alain Giresse ◽  
Djebayole Mimbe III Yannick
Keyword(s):  
Radiation Field ◽  
Quantum Key Distribution ◽  
Secure Communication ◽  
Photon Number ◽  
Threshold Detector ◽  
Decoy State ◽  
Safety Distance ◽  
Parametric Down Conversion ◽  
Down Conversion ◽  
Photon Source

We discuss the influence of radiation field on the secure key size and the maximum safety distance during QKD by using a set of photons produced via a spontaneous parametric-down conversion (SPDC) photon source. Four implementations that use multiple-photons and decoy states are discussed, these include nondecoy state, infinite active decoy state, passive decoy state with threshold detector and passive decoy state with perfect photon-number resolving detector. Results show that the radiation field significantly improves both the secure key size and the maximum secure communication distance. Therefore, the radiation field is found to be a good candidate to reduce unwanted interactions of photons with the quantum channel and hence, to increase the secure key rate and the maximum safety distance between legitimate users.

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