A system is disclosed for producing an output photon having a predefined frequency. The system comprises a frequency comb generator for generating a frequency comb. The system further comprises a frequency comb mode selector configured to: receive a heralding signal representative of the detection of a first photon of a frequency-correlated photon pair, the heralding signal indicative of a frequency of the heralded second photon of the frequency-correlated photon pair; and select, based on the received heralding signal, a comb spectral mode of the frequency comb. The system further comprises a non-linear photonic element configured to receive the heralded second photon and the selected comb spectral mode and produce an output photon having the predefined frequency based on the frequency of the heralded second photon and the selected comb spectral mode. Methods, controllers and computer-readable media are also described herein.

An imaging system is provided that includes a pulsed light source providing pulsed light and is applicable to both microscopes and endoscopes. One or more optical elements with certain dispersive properties are positioned to receive the pulsed light and apply selective dispersive properties to shift the focal plane according to the user and to produce two photon (2p) wide field uniform illumination and 2p wide field structured illumination for the purpose of improving the optical axial resolution and rejection of background signal. An imaging element receives the signal arising from the 2p wide field uniform illumination and 2p wide field structured illumination and produces a respective 3D resolved image of a sample.

System and method for generating quantum-entangled photons. First and second laser sources are coupled to each of a plurality of multi-mode optical fibers. The first laser source is coupled into one guided mode and the second laser source is coupled into another guided mode for each of the fibers. Intermodal four-wave mixing the outputs of the fibers separates the signals. A signal combiner recombines the filtered outputs to produce a broadband source of quantum-entangled photons.

A frequency conversion system includes a bus waveguide, a first pump laser coupled to the bus waveguide and characterized by a first frequency, a second pump laser coupled to the bus waveguide and characterized by a second frequency, an input light combining device coupled to the bus waveguide and configured to combine light from the first pump laser and the second pump laser to produce a combined light, and a plurality of optical resonators coupled to the bus waveguide. Each optical resonator of the plurality of optical resonators has a respective resonance line width, wherein for each optical resonators of the plurality the respective resonance line width overlaps with a resonance line width of at least one adjacent optical resonator of the plurality of optical resonators, and wherein each optical resonator of the plurality is configured to generate output light at a converted frequency via frequency mixing.

Displacement measurement systems, measurement methods and EUV lithography machines for quantum meta-structure elements are disclosed, which include: an entangled state light source generator, a meta-device, a collimating lens, a polarizing beam splitter, and a computing section. Left-rotation photon and the right-rotation photon are projected to the polarizing beam splitter, and the correlation between output ports of two polarizing beam splitters is counted for reading to measure the displacement of the meta-device element. The displacement of the meta-structure element is measured in a manner that realizes the correlation between the left-rotation photons and the right-rotation photons.

A device for the generation of supercontinuum in infrared fiber with a pump light comprising a microchip laser operating with a wavelength of 1.0 m or greater that can be wavelength shifted though a nonlinear element to a wavelength beyond the two-photon absorption of the infrared fiber and launched into infrared fiber whereby the spectrum is broadened in the infrared fiber through various nonlinear processes to generate a supercontinuum within the mid-IR from 2 to 14 m.

A photonic quantum memory is provided. The photonic quantum memory includes entanglement basis conversion module configured to receive a first polarization-entangled photon pair and to produce a second entangled photon pair. The second polarization-entangled photon pair can he a time-bin entangled or a propagation direction-entangled photon pair. The photonic quantum memory further includes a photonic storage configured to receive the second entangled photon pair from the basis conversion module and to store the second entangled photon pair.

A technique relates to a circuit for a sum frequency generator. A first resonator is connected to a Josephson ring modulator (JRM), and the first resonator is configured to receive a first photon at a first frequency. A second resonator is connected to the JRM, and the second resonator is configured to have a first harmonic and no second harmonic. The second resonator is configured to receive a second photon at a second frequency, and the first resonator is configured to output an up-converted photon. The up-converted photon has an up-converted frequency that is a sum of the first frequency and the second frequency.

In accordance with a method for individually addressing qubits in a set of qubits, a plurality of qubits is provided that each have two internal states representing a unit of quantum information. A transition between the two internal states of each qubit is caused by a two-photon Raman transition. Each of N ones of the qubits in the plurality of qubits are individually addressed using one of N pairs of laser beams, respectively, N being an integer greater than or equal to two. The laser beams in each of the N pairs have a frequency difference equal to a qubit transition frequency that represents a difference in frequency between the two internal states of the qubits. The laser beams in each pair of laser beams operate at different frequencies than the laser beams in every other pair of laser beams.

A photonic circuit with at least one nonlinear amplitude thresholder for correcting errors produced by linear photonic logic. One or more photonic input gates of the photonic circuit receive one or more input signals and generate one or more photonic signals based on the one or more photonic input signals. A first set of one or more photonic gates of the photonic circuit generates one or more intermediate photonic signals based on the one or more photonic signals. The at least one nonlinear amplitude thresholder generates at least one photonic thresholding signal based on the one or more intermediate photonic signals, the at least one nonlinear amplitude thresholder operating in a first operating regime, second operating regime, and/or third operating regime. A second set of one or more photonic gates of the photonic circuit generates one or more photonic output signals based on the at least one photonic thresholding signal.