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We experimentally characterize a spontaneous parametric down-conversion source, based on a Beta-Barium-Borate crystal capable of emitting photons with positive or no spectral correlations. Our system employs a carefully designed detection method exploiting two InGaAs detectors.
Quantum photonics is a promising technology for implementing quantum information tasks. We demonstrate integration of multiple photon pair sources together with a circuit enabling creation and manipulation of photon pairs in a monolithic silicon-on-insulator chip.
A photoconductive terahertz detector based on plasmonic contact electrodes is experimentally demonstrated. Incorporating plasmonic contact electrodes mitigates the inherent tradeoff between high quantum-efficiency and ultrafast operation, enabling more than 30 times higher terahertz detection sensitivities.
Using photon-number resolving detectors, we directly measure the parity of coherent states in a Mach-Zehnder interferometer. Phases are super resolved by a factor of 150 and shot noise limited measurements are demonstrated with 200 photons.
We experimentally demonstrate the use of an on-chip integrated Schottky plasmonic detector for testing, monitoring and tapping signals in plasmonic and photonic devices. Theoretical model and measurement of external and integrated devices will be presented.
Using the methods of the information theory, we derive the fundamental limit to the resolution of optical imaging, and demonstrate that in the far-field, contrary to the conventional wisdom, it is not equal or close to one half of the wavelength.
We report a complete experimental realization of measurement device independent quantum key distribution system with decoy method, which closes loopholes in both source and detection. 25-kbit secure key is generated over a 50-km fiber link.
We report stable operation of a multi-user Quantum Access Network over more than 24 hours. We connect multiple quantum transmitters to a single quantum receiver by pre-compensating all phase and polarisation fluctuations.
Using a highly efficient (74%) PPKTP source of narrowband polarization entangled photon pairs (as measured with TES detectors) together with a fast polarization modulator (11 ns) we should be capable of a loophole free Bell test.
We present a scheme for recovering the input signal launched into a waveguide array from partial measurements of its output intensity, given that the input is sparse. Possible applications include optical interconnects, and quantum tomography.
We demonstrate state-of-the-art uncooled photodetectors for low-bias (2–4V) operation with high responsivities, high saturation currents, and broad bandwidths. High responsivity (1.09A/W), high bandwidth (39GHz) and the OIP3 (47dBm) were achieved at −3V bias.
We implemented single-photon detector in 1500-nm band based on frequency up-conversion in nonlinear waveguide at pump wavelength of 1920 nm. Ultralow dark count rate and signal photon detection rate are 20 s−1 and 56.8 s−1.
We report on the direct monitoring of singlet oxygen luminescence at 1270 nm wavelength using a fiber coupled superconducting nanowire single-photon detector. These results open the pathway to practical dose monitoring in photodynamic therapy.
Tiny perturbation, in different places, probe where was a photon passing through an interferometer. A surprising picture emerges, which is not a continuous trajectory or set of continuous trajectories.
In a Monte Carlo simulation, we feedback with conditional measurements and a multiple-step spontaneous parametric downconversion process to generate number-squeezed photonic states with sub-Poissonian variance. A 12 photon state is demonstrated with a success rate of 30%.
We report on a highly sensitive detection of sub-nanosecond terahertz-waves with wide dynamic range using frequency up-conversion in a nonlinear MgO:LiNbO3 crystal at room temperature. The generation of the detection signal is based on optical parametric mixing between an input terahertz-wave radiation and an intense near-IR pumping beam. We obtained the dynamic range of more than 100 dB.
We demonstrate a symmetric, single-spatial mode, single-photon heralding efficiency of 84% for a type-II spontaneous parametric downconversion process. High efficiency, single-spatial mode collection is key to enabling many quantum information processing and quantum metrology applications.
Our balanced Franson interferometer allows observation locally of Hong-Ou-Mandel and biphoton de Broglie interference and non-local Franson interference with suppressed single-photon interference. Advantages are its size, pulsed source compatibility, and passive visibility monitoring.
We have developed 12-pixel arrays of fiber-coupled tungsten silicide superconducting nanowire single photon detectors and performed end-to-end tests of a 39 Mbps pulse position modulation optical communication link with a software receiver.
We demonstrated photon-number resolved detection with sinusoidally gated multipixel photon counter operated at room temperature. Sinusoidal gating minimized the capacitive response noise and improved the photon-number-resolving performance at high repetition rate up to 200 MHz.
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