Abstract: The present disclosure describes a system with a boson sampler that generates an output bosonic state by performing a transformation on an input bosonic state and produces measurement outcomes indicating the presence or absence of bosons in output modes. A controller of the system receives these measurement outcomes, generates binary sequences based on the presence or absence of bosons, and determines a solution to a binary optimization problem.

Abstract: A system may include a boson sampler configured to generate an output bosonic state by performing a parametrized unitary transformation on an input bosonic state. The system may include a controller coupled to the boson sampler. The controller may be configured to: (i) determine a set of one or more parameter values that defines the parametrized unitary transformation performed by the boson sampler, (ii) operate the boson sampler multiple times with the boson sampler tuned to the determined set of parameter values, (iii) record one or more responses of the boson sampler for the multiple operations (iv) generate binary sequences based on the responses, (v) calculate values of an objective function of a binary optimization problem, and (vi) determine a solution to the binary optimization problem based on the calculated values.

Abstract: A programmable filter for electronic signals. The filter includes an input that splits power of the input signal along two paths, a first and second path that is phase shifted by ninety degrees in respect of the first path. The first and second path are each modulated to the optical domain, and provided as input to respective filter chains. The in-phase signal can be filtered by IIR or FIR optical filters with configurable operation, as well the shifted signal can be filtered by a second chain of IIR and FIR optical filters with configurable operation. Resulting output from each filter chain is recombined and demodulated from the optical domain. In this manner, the electronic filter can adopt any suitable impulse response, including impulse responses described with complex coefficients. Real parts can be configured by operation of the first filter chain and imaginary parts by operation of the second filter chain.

Abstract: A signal generator provides a periodic optical signal as output. The signal generator can be optically coupled to a splitter or other distribution network that transits the optical signal along multiple paths to terminate at different locations and/or for use by multiple electronic circuits. Each path can include a reflector element that reflects a portion of the signal back along the optical signal path. Reflections can be separated by operation of a circulator and photodiode. Output of the photodiode can be used to adjust phase and/or amplitude of optical signals traversing each optical signal path such that each electronic circuit receives an in-phase reference signal as input.

Abstract: Methods and systems are provided for performing an encoded n-qubit GHZ measurement on n encoded (logical) qubits using encoded Bell state measurements (E-BSMs). Each E-BSM comprises a plurality of dual-rail Bell state measurements (DR-BSMs) performed on pairs of dual-rail encoded photonic qubits (DR-qubits). Methods and systems for using encoded n-qubit GHZ measurements for fault-tolerant measurement-based quantum computation are also provided.

Abstract: 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.

Abstract: 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.

Abstract: An apparatus is disclosed herein. The apparatus comprises a non-linear photonic element for outputting a signal and idler photon pair. The apparatus further comprises a module configured to, based on receiving one or more control signals, controllably store photons and controllably output stored photons. The apparatus further comprises a detector arrangement comprising one or more detectors for detecting light. The module is further configured to receive at least one of the signal and idler photons of the pair. The module is further configured to at least partially store one of the signal or idler photons of the pair. The module is further configured to output the said at least partially stored signal or idler photon along an optical path towards the at least one detectors. The apparatus is configured to direct the other of the signal or idler photon towards the detector arrangement.

Abstract: A method of co-manufacturing silicon waveguides, SiN waveguides, and semiconductor structures in a photonic integrated circuit. A silicon waveguide structure can be formed using a suitable process, after which it is buried in a cladding. The cladding is polished, and a silicon nitride layer is disposed to define a silicon nitride waveguide. The silicon nitride waveguide is buried in a cladding, and annealed. Thereafter, cladding above the silicon waveguide structure can be trenched through, and low-temperature operations can be performed to or with an exposed surface of the silicon waveguide structure.

Abstract: A photonics package that incorporates a liquid crystal lens situated between a light source and a waveguide or output element of the package. The liquid crystal lens may focus or collimate light passing through it. This may be useful, for example, to focus light from a light source on or at an entry of a waveguide. Certain embodiments may include or incorporate routing or optical elements between the light source and the liquid crystal lens, and/or on a side of the lens opposite a side on which the light source is located.

Abstract: An apparatus has a plurality of photonic elements. At least two photonic elements forming a cavity. At least one photonic element receives first electromagnetic radiation from outside the cavity and transmits the first electromagnetic radiation into the photonic cavity. At least one photonic element receives second electromagnetic radiation from outside the cavity and transmits the second radiation into the photonic cavity. A photonic memory disposed in the cavity comprises an atomic system that: receives a photon field of first radiation; receives second radiation; stores at least a portion of the field of the photon in the atomic system via an atomic transition using the photon and the received second radiation; emits the stored portion of the photon upon receiving third electromagnetic radiation. The apparatus directs the photon into the photonic memory, after being reflected into the photonic cavity by at least one of the photonic elements; and outputs the emitted portion of the field into the cavity.