Abstract: A quantum computing system providing quantum processing as a service includes a quantum computing device and a server including at least one classical processor. The server is configured to: create a first job queue that includes a plurality of jobs configured to be executed on the first quantum computing device; receive, from a client device, a request for execution of a quantum program; add a first job entry to the first job queue for the request, the first job entry includes a quantum circuit for a first job; perform an optimization process on the quantum circuit of the first job; transmit the updated quantum circuit to the first quantum computing device for execution by the first quantum computing device using the plurality of qubits; receive, from the quantum computing device, execution results from the execution of the updated quantum circuit; and transmit the execution results to the client device.

Abstract: Sense+compute (S+C) quantum-state carriers (QSCs), e.g., rubidium atoms, can be used provide more scalable quantum sensor systems. Multiple S+C QSCs can capture sensor data. The sensor data can then be transformed in the quantum domain according to a quantum tomographic protocol. The transformed data can be measured to provide a respective classical domain measurement. The sensing, transformation, and measurement can be repeated to provide a set of measurements (corresponding to different transformations) that can be combined according to the quantum tomography protocol to generate a model of the original quantum state. Estimation error associated with the model can be scaled down at a rate corresponding more closely to increases in the number N of QSCs than ?{square root over (N)}, even in the presence of noise.

Abstract: A quantum-hardened power grid includes grid nodes (e.g., power plants, renewable energy sources and substations) and transmission lines connecting the grid nodes. The grid nodes include stable quantum clocks that permit the power grid to continue operation in the event of downtime for a GPS or other external synchronization reference. Operation sans an external reference can be extended by synchronizing atomic clocks across grid nodes using a quantum network. The atomic clocks can be used with quantum sensors and quantum computers to provide grid state estimates, e.g., using quantum tomography “at the edge”. In addition, these quantum devices can be used to compute responses to grid faults and cyberattacks.

Abstract: A quantum computing system for optimizing instructions of a quantum circuit is configured to: select reference points in a parameter space of a family of gates that are executable by the quantum processor; identify edges in the parameter space connecting two reference points; compute a pulse vector for each reference point of the plurality of reference points; optimize the pulse vector for each reference point of the plurality of reference points based on the first pulse vector of each neighboring reference point connected to that reference point by an edge; receive a target operation from the quantum circuit for optimization; compute a second pulse vector for the target operation based on interpolating between a subset of reference points of the plurality of reference points; and executed the target operation on a quantum processor using the pulse vector for the target operation.

Abstract: A computing system includes a quantum processor with qubits, a classical memory including a quantum program defining a plurality of instructions in a source language, and a classical processor configured to: (i) receive a circuit of gates representing a quantum program for a variational algorithm in which computation is interleaved with compilation; (ii) identify a plurality of blocks, each block includes a subcircuit of gates, leaving one or more remainder subcircuits of the circuit of gates outside of the plurality of blocks; (iii) pre-compile each block of the plurality of blocks with a pulse generation program to generate a plurality of pre-compiled blocks including control pulses configured to perform the associated block on the quantum processor; and (iv) iteratively execute the quantum program using the pre-compiled blocks as static during runtime and recompiling the one or more remainder subcircuits on the classical processor at each iteration of execution.

Abstract: A computing system includes a quantum processor with qubits, a classical memory including a quantum program defining a plurality of instructions in a source language, and a classical processor configured to: (i) receive a circuit of gates representing a quantum program for a variational algorithm in which computation is interleaved with compilation; (ii) identify a plurality of blocks, each block includes a subcircuit of gates, leaving one or more remainder subcircuits of the circuit of gates outside of the plurality of blocks; (iii) pre-compile each block of the plurality of blocks with a pulse generation program to generate a plurality of pre-compiled blocks including control pulses configured to perform the associated block on the quantum processor; and (iv) iteratively execute the quantum program using the pre-compiled blocks as static during runtime and recompiling the one or more remainder subcircuits on the classical processor at each iteration of execution.

Abstract: A quantum computing system includes a quantum processor having a plurality of qubits, a classical memory, and a classical processor.

Abstract: A quantum computing system includes a quantum processor having a plurality of qubits, a classical memory, and a classical processor.

Abstract: A switching network incorporates expander graphs such as multibutterflies but avoids the wiring complications resulting from the randomness of such graphs. The network includes metanodes, each having plural routers. Channels of multiple interconnections are connected between the metanodes according to an upper level expander graph. Interconnections within the channels are randomly connected. Interconnections on the channels may be time multiplexed and they may be dynamically assigned to routers within a metanode.