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Some modified two-slit interference experiments were carried out showing an apparent paradox in wave-particle duality. In a typical such experiment, the screen, where the interference pattern is supposed to be formed, is replaced by a…

Quantum Physics · Physics 2023-04-05 Tabish Qureshi

A gas of ultracold atoms probed with laser light is a nearly-ideal experimental realization of a medium of resonant point-like scatterers, a key problem from condensed matter to biology or photonics. Yet, several recent experiments have…

Quantum Gases · Physics 2026-02-17 R. Vatré , R. Lopes , J. Beugnon , F. Gerbier

Fluorescence excitation by absorption of entangled photon pairs offers benefits compared to classical imaging techniques, such as the attainment of higher signal levels at low excitation power while simultaneously mitigating photo-toxicity.…

Quantum Physics · Physics 2023-11-02 Tobias Bernd Gäbler , Patrick Hendra , Nitish Jain , Markus Gräfe

The aim of this review paper is to enlighten some recent progresses in quantum optical metrology in the part of quantum efficiency measurements of photo-detectors performed with bi-photon states. The intrinsic correlated nature of entangled…

Quantum Physics · Physics 2015-06-26 G. Brida , M. Genovese , M. Gramegna

Measuring the $M$th-order intensity correlation function of light emitted by two statistically independent thermal light sources may display N00N-like interferences of arbitrary order $N = M/2$. We show that via a particular choice of…

Quantum Physics · Physics 2018-11-14 Daniel Bhatti , Anton Classen , Raimund Schneider , Steffen Oppel , Joachim von Zanthier

Generating nonclassical light offers a benchmark tool for the fundamental research and potential applications in quantum optics. Conventionally, it has become a standard technique to produce the nonclassical light through the nonlinear…

Quantum Physics · Physics 2011-04-04 Shengwang Du , Jianming Wen , Morton H. Rubin

Classical time-resolved optical spectroscopy experiments are performed using sequences of ultrashort light pulses, with photon fluxes incident on the sample which are many orders of magnitude higher than real-world conditions corresponding…

Ghost imaging with thermal fermions is calculated based on two-particle interference in Feynman's path integral theory. It is found that ghost imaging with thermal fermions can be simulated by ghost imaging with thermal bosons and classical…

Quantum Physics · Physics 2017-03-01 Jianbin Liu , Yu Zhou , Huaibin Zheng , Hui Chen , Fu-li Li , Zhuo Xu

We present an experimental demonstration of the full control of the frequency correlations of entangled photon pairs. The joint spectrum of photon pairs is continuously varied from photons that exhibit anticorrelation in frequency to…

Quantum Physics · Physics 2009-08-14 M. Hendrych , M. Mičuda , A. Valencia , J. P. Torres

Light with high mutual correlations at different frequencies can be used to create heralded single-photon sources, which may serve as the basic elements of existing quantum cryptography and quantum teleportation schemes. One of the…

Quantum Physics · Physics 2022-08-10 I. V. Panyukov , V. Yu. Shishkov , E. S. Andrianov

Conventional polarimetry, including schemes leveraging entangled light, characterizes optical samples through linear transformations of polarization states. We introduce a two-photon probing approach in which both photons of an entangled…

We numerically analyze the use of intense entangled twin beams for ultra-sensitive spectroscopic measurements in chemical and biological systems. The examined scheme makes use of intense frequency-modulated (chirped) entangled beams to…

Quantum Physics · Physics 2018-05-16 Jiří Svozilík , Jan Peřina , Roberto de J. León-Montiel

We report on a novel pseudothermal light source based on laser light coupled into an optical multimode fiber. The setup is simple, of low cost, exhibits inherently high directional light emission and allows for a flexible arrangement. By…

Quantum Physics · Physics 2017-08-02 Thomas Mehringer , Steffen Oppel , Joachim von Zanthier

We present the experimental generation of light with directly observable close-to ideal thermal statistical properties. The thermal light state is prepared using a spontaneous Raman emission in a warm atomic vapor. The photon number…

Quantum Physics · Physics 2018-10-17 J. Mika , L. Podhora , L. Lachman , P. Obšil , J. Hloušek , M. Ježek , R. Filip , L. Slodička

Two-photon superbunching of pseudothermal light is observed with single-mode continuous-wave laser light in a linear optical system. By adding more two-photon paths via three rotating ground glasses,g(2)(0) = 7.10 is experimentally…

Optics · Physics 2017-10-11 Bin Bai , Jianbin Liu , Yu Zhou , Huaibin Zheng , Hui Chen , Songlin Zhang , Yuchen He , Fuli Li , Zhuo Xu

We describe a tunable low-energy photon source consisting of a laser-driven xenon plasma lamp coupled to a Czerny-Turner monochromator. The combined tunability, brightness, and narrow spectral bandwidth make this light source useful in…

We present a source of polarization entangled photon pairs based on spontaneous parametric downconversion engineered for frequency uncorrelated telecom photon generation. Our source provides photon pairs that display, simultaneously, the…

We introduce a novel application of the Hartmann sensor, traditionally designed for wavefront sensing, to measure the coherence properties of optical signals. By drawing an analogy between the coherence matrix and the density matrix of a…

Quantum Physics · Physics 2025-04-04 M. Vitek , M. Peterek , D. Koutny , M. Paur , L. Motka , B. Stoklasa , J. Rehacek , Z. Hradil , L. L. Sanchez-Soto

Strong correlation of photons, particularly in the single-photon regime, has recently been exploited for various applications in quantum information processing. Existing correlation measurements, however, do not fully characterize…

Quantum Physics · Physics 2015-05-18 Hyun-Gue Hong , Hyunchul Nha , Jai-Hyung Lee , Kyungwon An

Entangled two-photon absorption can enable a linear scaling of fluorescence emission with the excitation power. In comparison to classical two-photon absorption with a quadratic scaling, this can allow fluorescence imaging or…