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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.
Position-dependent diffusion of light is observed experimentally in quasi-two-dimensional disordered optical waveguides. Strong wave interference effects make the diffusion coefficient depend on the size and shape of the random medium as well as the dissipation.
By introducing concepts of beam shaping from nonlinear optics into quantum mechanics, we show how interference of electrons wavefunctions can exactly balance the nonlinear self-repulsion of an electron-beam, creating nonspreading shape-preserving propagation in free-space.
We present a new method for intrusion detection which is based on the Mach-Zehnder interference effect. This device provides monitored surveillance by continuously measuring the intensity of light collected by a pair of photodetectors.
We propose a novel, directional fiber-optic level meter based on a micro-air-bubble drifted in a liquid-core fiber-Fabry-Pérot-interferometer which can detect non-horizontal state of structure/object and also be able to discriminate the inclining to clockwise/counterclockeise directions.
The mechanism of the nonlinear photo-carrier generation in low-temperature-grown GaAs by 1.5 μm pulses was investigated by a double pulse experiment. The effect of intermediate excitation on the photo response was distinctly observed. Moreover, the effect was found to be largely coherent, contrary to the proposed model.
Unexpected dispersion of the TEM mode in tapered parallel plate waveguides is investigated experimentally and numerically. The TE02 mode that adiabatically converts into the TEM mode interferes with the genuine TEM and explains this behavior.
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.
Optical nonlinear effects are examined using a two-color micro-photoluminescence method in a coherently-coupled exciton-biexciton system in a single quantum dot. The exciton nonlinear absorption spectrum shows an unusual asymmetric shape induced by Fano interference effects.
By mixing three nearly-even-spaced optical frequencies generated by coupled optical parametric oscillators based in KTP stacks and bulk KTP in a nonlinear medium, we demonstrate coherent interference of THz waves.
Using background-free quantum frequency conversion, two spectrally separate excitonic transitions from a single semiconductor quantum dot are converted to a single wavelength, and two-photon interference on the frequency-converted signal is demonstrated.
We propose a measurement system for high-speed vibration displacement using an interferometer with triangle-wave phase modulation. Displacement less than ±45 nm by 1-MHz vibration is proved measurable within a standard deviation of 1.5 nm.
We image the relative orientation of organized groups of noncentrosymmetric molecules (like collagen or myosin) at the micron scale in biological tissues by combining interferometry and Second Harmonic Generation (SHG) microscopy.
A controlled-swap operation for photons using two optical paths as a control qubit is demonstrated. The overlap between the input states can be directly evaluated by measuring the interference fringe visibility of the control qubit.
We report novel circular plasmonic interferomers for refractometric sensing with detection limit of 8.7×10−7 RIU using a multispectral sensing method. The efficient light suppression through destructive interference also allows low-background intensity-based detection with FOM∗ exceeding 140.
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.
Dynamic Franz-Keldysh effects are produced and controlled in GaAs by quantum interference techniques. The ∼3 THz transient plasma oscillations and the anisotropies that they cause are temporally (∼100 fs) and spatially (∼1 nm) resolved.
Nanolithography utilizing the nonlinear absorption of two surface plasmon polaritons in resists has been demonstrated. The linewidth of ∼λ0/11 are achieved by illuminating the plasmonic mask with the femtosecond laser, which is potential for future nanofabrication.
We present a protocol that combines quantum and classical resources to increase the sensitivity of a phase measurement. The superresolution is achieved through the use of N00N states and multiple passes through a prism pair.
We computationally and experimentally demonstrate super absorption, in a flat ultra-thin organic photovoltaic layer on metal substrates, based on interference effects of strongly absorptive ultra-thin films.
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