Abstract: Techniques for temporal quantum key distribution between at least a first entity and a second entity include measuring an arrival time of each of a plurality of photons within each of a set of time frames. The arrival time can correspond to one of the plurality of time bins within the time frame. Measuring can occur in a randomly selected one of at least two mutually unbiased bases. The mutually unbiased bases can include a basis corresponding to a measurement with dispersion and a basis corresponding to a measurement without dispersion. The randomly selected basis for each time frame can be communicated, via a classical communications channel. A quantum key can be generated from the time bins corresponding to the arrival time of photons within at least some of the time frames for which the randomly selected basis is consistent between the first and the second entity.

Abstract: Techniques for temporal quantum key distribution between at least a first entity and a second entity include measuring an arrival time of each of a plurality of photons within each of a set of time frames. The arrival time can correspond to one of the plurality of time bins within the time frame. Measuring can occur in a randomly selected one of at least two mutually unbiased bases. The mutually unbiased bases can include a basis corresponding to a measurement with dispersion and a basis corresponding to a measurement without dispersion. The randomly selected basis for each time frame can be communicated, via a classical communications channel. A quantum key can be generated from the time bins corresponding to the arrival time of photons within at least some of the time frames for which the randomly selected basis is consistent between the first and the second entity.

Abstract: Systems and methods for coupling electromagnetic radiation from fiber arrays into waveguides and photonic chips are disclosed. In one aspect of the disclosed subject matter, systems for coupling electromagnetic radiation from an optical fiber into a waveguide are provided. In some embodiments, the system can include at least one optical fiber having a distal portion adapted for allowing a portion of an electromagnetic field to exist outside of the fiber. At least one waveguide can have a surface adapted to receive the distal portion of the fiber and be shaped such that the fiber presses against the waveguide creating a repeatable interface. The fiber and the waveguide are arranged so at least part of the portion of the field existing outside the fiber extends into the waveguide. In another aspect of the disclosed subject matter, methods for coupling electromagnetic radiation from the fiber to a photonic integrated chip are disclosed.

Abstract: Techniques for converting signal and idler photons generated by a nonlinear optical system into a deterministic stream of single photons including receiving a heralded, nondeterministic source of signal and idler photons from the nonlinear optical process, separating one or more received signal photons from one or more received temporally corresponding idler photons, determining whether at least one of the one or more signal photons should be variably delayed, and if so, determining a delay length, and variably delaying the emission of one of the one or more signal photons, if any, by the determined delay length.

Abstract: Compactly-integrated electronic structures and associated systems and methods are provided. Certain embodiments relate to the ability to integrate nanowire-based detectors with optical components.

Abstract: A method for distributing a quantum key is provided, including sending a first photon to a first receiver; sending a second photon to a second receiver, the first and second photons being a pair of time-energy entangled photons; and providing a coding scheme comprising a plurality of time bins and a plurality of frequency bins, wherein a combination of a time bin and a frequency bin corresponds to a character.

Abstract: Techniques for converting signal and idler photons generated by a nonlinear optical system into a deterministic stream of single photons including receiving a heralded, nondeterministic source of signal and idler photons from the nonlinear optical process, separating one or more received signal photons from one or more received temporally corresponding idler photons, determining whether at least one of the one or more signal photons should be variably delayed, and if so, determining a delay length, and variably delaying the emission of one of the one or more signal photons, if any, by the determined delay length.

Abstract: A method for distributing a quantum key is provided, including sending a first photon to a first receiver; sending a second photon to a second receiver, the first and second photons being a pair of time-energy entangled photons; and providing a coding scheme comprising a plurality of time bins and a plurality of frequency bins, wherein a combination of a time bin and a frequency bin corresponds to a character.