The specification relates to a microscopy system. The microscopy system includes a first laser emitting a first laser pulse, the first laser pulse being a pump beam; a second laser emitting a second laser pulse, the second laser pulse being a probe beam; time delay components for delaying the probe beam, wherein the time delay components delay the probe beam by 0.3 ps to 5 ns relative to the pump beam; an optical device for combining the pump beam and the delayed probe beam into a combined laser pulse, the combined laser pulse having a reduced focal spot size; a galvanometer scanning system for delivering the combined laser pulse to a focal spot in a focal plane, wherein the reduced focal spot size of the combined laser pulse initiates a stimulated emission of a targeted molecule, the stimulated emission having dipole-like backscatter, and a detector for detecting the dipole-like backscatter.

An apparatus and method for the projection of stereoscopic images that includes a pulsed laser that generates green light and an optical fiber that generates stimulated Raman scattered light. The stimulated Raman scattering light is divided into green light and red light and the colors are used to form stereoscopic images. Additional lasers may be added to meet specific primary color targets and to balance the brightness of the images for each eye.

A system for generating clock signals for a photonic quantum computing system includes a first pump photon source, a first photon-pair source optically coupled to the first pump photon source, and a first photodetector optically coupled to the first photon-pair source. The system also includes a first clock generator electrically coupled to the first photodetector, a second pump photon source, a second photon-pair source optically coupled to the second pump photon source, and a second photodetector optically coupled to the second photon-pair source. The system further includes a second clock generator electrically coupled to the second photodetector and a clock mediator coupled to the first clock generator and the second clock generator.

There is presented an optical apparatus comprising first and second photon pair sources configured to convert at least one pump light photon into a first and second correlated signal and idler photon pairs. In one example, the apparatus is configured to use one of the signal and idler photons from the first correlated photon pair for controlling the conversion of the pump light photon in the second photon pair source. The apparatus may configured such that, at least one of the signal and idler photons from the first correlated photon pair is output from the first photon pair source onto an optical path wherein at least one of the signal and idler photons from the second correlated photon pair is output from the second photon pair source onto the optical path. A method is also provided for outputting one or more photons using the optical apparatus.

Optical system for the generation of entangled photons comprising a light source configured to generate a first beam of coherent light, at least one first balanced beam displacement, BBD, element, a nonlinear optical element comprising a nonlinear optical material, and at least one second BBD element, wherein the at least one first BBD element is configured to split the source beam into at least a first pump beam and a second pump beam upstream of the nonlinear optical element, wherein the nonlinear optical material is configured to interact via spontaneous parametric down-conversion, SPDC, with the first pump beam and the second pump beam to generate photon pairs, each photon pair comprising a signal photon and an idler photon, and wherein the at least one second BBD element is configured to combine the trajectories of the generated photon pairs downstream of the nonlinear optical element.

A method of generation of a random symbol sequence using quantum opto-electronic devices A and B with device-independent security is disclosed. The method is characterized by the two sources each producing entangled two-beam, pulsed multiphoton quantum states of light and sending one beam to a quantum interference and measurement device C. Before being sent, the beams are multiplexed with coherent beams. Quantum interference and measurement device C demultiplexes them and uses coherent beams for compensating the fluctuations in the quantum beams. Then, it interferes quantum beams on a beam splitter, measures the output and sends results back. Subsequently, A and B share an entangled state. They interfere local beams with coherent light on beam splitters and measure on detectors. A fraction of measurements are kept secret and used as the source of symbols forming the cryptographic key, while others are used to establish the security using an entanglement test.

A multiplexed single photon source for quasi-deterministically generating single photons, wherein heralded random single photons generated by pulsed random single photon source are sent through a series of optical switches each having first and second input and output modes and each capable of being switched from a first state corresponding to a SWAP operation to a second state corresponding to an Identity operation on the mode space, whereby the first and second input and output modes of the switches are connected in series to form a first and second optical path respectively, and whereby a first output mode of a last optical switch forms the output mode of the multiplexed single photon source and a second output mode of the last optical switch is connected by a delay loop introducing a time delay T.sub.d to the second input mode of a first optical switch. It furthermore relates to a method of quasi-deterministically generating single photons with such a multiplexed single photon source, the method comprising initializing, before or at the start of a first cycle, the first switch in the first state and all subsequent switches in the second state; switching, when the generation of a random single photon is heralded, the first switch to the second state after that photon has been routed onto the closed optical path formed by the second optical path and the delay loop, thereby ensuring that the photon may loop around the closed optical path; and, switching, at the start of the Nth cycle, a last switch of the series of optical switches into the first state, thereby causing the photon to be routed out of the closed optical path and into the output mode of the multiplexed single photon source, such that the photon is output quasi-deterministically at a time N Td after the start of the first cycle.

A system is provided for producing an output photon having a predefined frequency. A pump module produces a plurality of pump fields at a plurality of pump frequencies. A photon pair source module generates frequency-correlated photon pairs. A detector module generates a heralding signal subsequent to detecting a first photon of a photon pair, the heralding signal indicative of a frequency of the second photon of the pair. A non-linear photonic element is arranged to (1) receive the heralded second photon and a complementary selected pump field, and (2) to produce an output photon having the predefined frequency. A pump field selector is configured to (1) receive a heralding signal and (2) select, based on the received heralding signal, a pump field of the plurality of pump fields for provision to the non-linear element. Methods, controllers and computer-readable media are also described herein.

An atomic object confined in a particular region of a confinement apparatus is cooled via a simultaneous sideband and Doppler laser cooling operation. A controller controls first and second manipulation sources to provide first and second two-photon transition manipulation signals to the particular region. The controller controls a third manipulation source to provide a repump manipulation signal to the particular region. The first and second two-photon transition manipulation signals are collectively configured to cause the atomic object to undergo a red sideband transition from a first ground state to a second ground state. The repump manipulation signal is configured to repump the atomic object from the second ground state to the first ground state via an excited state. The repump manipulation signal is red detuned from a transition from the second ground state to the excited state by a repump detuning configured to cause Doppler cooling of the atomic object.

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.