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We show the generation of fully uncorrelated photon pairs in an integrated device. A fully separable state is obtained by independent control over the quality factors of the resonances involved in the parametric fluorescence process.
Using the directional photocurrent induced by quantum interference between two- and three-photon absorption in a semiconductor (AlGaAs), we measure the comb offset frequency of a mode-lock fiber laser.
We show that using the electric field as a canonical quantization variable in nonlinear optics leads to incorrect expressions for the squeezing parameters in SPDC and conversion rates in frequency conversion.
We introduce a simple methodology to calculate the effects of self- and cross-phase modulation in SPDC photon generation. We show that these processes make SPDC less efficient in the low spatio-temporal mode number limit.
We present an approach to the generation of path-encoded Greenberger-Horne-Zeilinger states in a single chip, by interfering four integrated microring resonators in which degenerate spontaneous four-wave mixing takes place.
We demonstrate the generation of W states entangled in the energy degree of freedom. Using a reduced density matrix approach, these states are characterized without the need for frequency conversion.
We show that Rabi-like coherent oscillations should be observable in integrated microresonators used for quantum frequency conversion, revealing a new regime of strongly coupled photonic modes.
Decompositions of thermal light into localized pulses are highly desirable. We introduce a decomposition of thermal light in a quasi-1D waveguide into sets of localized coherent pulses.
We present a strategy for carrier-envelope phase measurements using photocurrents due to quantum interference of two- and three-photon absorption processes. Our calculations include the injection current dependence on the optical polarizations and frequencies.
We demonstrate by experiment, simulation, and a simple analytical model that superradiance can be observed in a planar array of nanoantennas, with a linewidth that scales with the number of nanoantennas within a square wavelength.
We realize the frequency-resolved reconstruction of the density matrix of polarization-entangled photon pairs by stimulated emission tomography. This approach enables deeper insight into the correlations between different degrees of freedom in the photon-pair source.
We provide convex decompositions of thermal equilibrium for non-interacting non-relativistic particles in terms of localized wave packets. These quantum representations offer new calculation tools and insights as they help relate to the classical picture.
Controlling superpositions of electronic quantum states through nonlinear interactions is central to quantum computing. At THz frequencies, solid-state systems exhibit numerous elementary excitations suitable to this purpose, yet efficient dephasing mechanisms render their exploitation challenging. The cyclotron resonance, protected from Coulomb interactions by Kohn's theorem, is a unique exception...
We demonstrate quantum interference of injected photocurrents in a semiconductor using a phase stabilized modelocked Ti:sapphire laser. Using this technique we detect the laser offset frequency with a 40 dB signal to noise ratio in a 10 Hz resolution bandwidth.
We reconstruct the polarization-entangled state of individual frequency components of the biphoton wave function by stimulated emission tomography. The frequency-resolved polarization state enables new insight into frequency-polarization correlations of the quantum process.
Can thermal light be represented by a mixture of single pulses? It cannot; only a modified mixture can yield the correct first-order correlation function at equal space-points. Still, this fails to reproduce higher orders.
We model the dependence of terahertz third harmonic generation in undoped graphene on the frequency of the incident pulse. We find a very strong increase in the response in going from 0.5 THz to 2 THz.
We develop a density-matrix formalism in the length gauge to simulate the nonlinear response on undoped graphene at terahertz frequencies. The generation of high harmonics is controlled by the strong interplay between intraband and interband dynamics. We present the differential signal, which reveals clear evidence of the high harmonic generation.
Optics of hyperbolic metamaterials is revisited in terms of large-wavevector waves, evanescent in isotropic media but propagating in presence of extreme anisotropy. Identifying the physical nature of these waves as Bloch volume plasmon polaritons, we derive their existence conditions and outline the strategy for tailoring their properties in multiscale metamaterials.
We demonstrate the measurement of photon-pair joint spectral correlations in optical fiber through stimulated four-wave mixing. This method enables us to study correlations more easily, precisely and quickly than with traditional coincidence counting measurements.
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