Abstract: A method of encryption for quantum-secured communication includes structuring a pair of quantum-enabled hardware security modules to include an interface to a temporarily common quantum channel and an interface to a communication channel. A secret key is shared with the pair of quantum-enabled hardware security modules for a symmetrical encryption between the pair of quantum-enabled hardware security module. The secret key is obtained using quantum key distribution via the temporarily common quantum channel. The temporarily common quantum channel is disconnected from at least one of the pair of quantum-enabled hardware security modules and a communication network is structured to include at least two nodes configured to communicate using symmetrical encryption between the pair of quantum-enabled hardware security modules sharing a same secret key.

Abstract: Systems and methods are disclosed for making a quantum network node. A plurality of scoring function F values are calculated for an array of at least two photonic crystal cavity unit cells, each having a lattice constant a and a hole having a length Hx and a width Hy. A value of a, a value of Hx, and a value of Hy are selected for which a scoring function value is at a maximum. A waveguide region and the array of at least two photonic crystal cavity unit cells based on the selected values are formed on a substrate. At least one ion between a first photonic crystal cavity unit cell and a second photonic crystal cavity unit cell are implanted and annealed into a quantum defect. A coplanar microwave waveguide is formed on the substrate in proximity to the array of at least two photonic crystal cavity unit cells.

Abstract: Monolithic phononic crystal for vibration isolation comprising: a two-dimensional array of a plurality of resonant masses, said resonant masses being connected by bridges; wherein transition regions between bridges and resonant masses have a concave shape in the plane of the two-dimensional array, respectively; wherein the resonant masses each have convex edges in the plane of the two-dimensional array; wherein the bridges are recessed with respect to the thickness of the resonant masses.