Abstract: A system comprising a quantum control data exchange circuit that enables a large, variable number of pulse generation circuits to exchange data within the coherence time of a plurality of quantum elements to enable feedback-based quantum control of a large, variable number of quantum elements.

Abstract: A system comprises pulse instruction memory and pulse generation circuitry, wherein the pulse generation circuitry is operable to retrieve a pulse instruction from the pulse instruction memory, and concurrently generate one or more analog pulses based on a first one or more fields present in the pulse instruction, and one or more digital pulses based on a second one or more fields present in the pulse instruction.

Abstract: A system comprises pulse generation and measurement circuitry comprising a plurality of pulse generator circuits and a plurality of ports, and management circuitry. The management circuitry is operable to analyze a specification of a controlled system and controlled elements that comprises a definition of a controlled element of the control system, and a definition of one or more pulses available for transmission by the control system. The management circuitry is operable to configure, based on the specification, the pulse generation and measurement circuitry to: generate the one or more pulses via one or more of the plurality of pulse generator circuits; and output the one or more pulses to the controlled element via one or more of the plurality of ports.

Abstract: Disclosed herein is a new paradigm for qubit control using clock multipliers and dual sampling rate direct synthesis to avoid Nyquist zone gaps while covering a wide spectrum without using any synthesizer that compromises the phase noise. This system and method for multi-Nyquist direct synthesis qubit control using clock multipliers and double sampling rate is scalable to thousands of RF channels synchronized to the picosecond level.

Abstract: A channel between quantum controller modules (e.g., pulse processors) is operable to communicate high speed data required for processing qubit states that may be distributed across a quantum computer. The latency of the communication channel is deterministic and controllable according to a system clock domain.

Abstract: In a quantum computer, quantum algorithms are performed by exciting a qubit with a quantum control pulse. This quantum control pulse is an electromagnetic RF signal that is generated at baseband according to an analog waveform. An application digitally generates samples of this analog waveform using multiple classical processors that control multiple physical channels in parallel.

Abstract: In a quantum computer, quantum algorithms are performed by a qubit interacting with a quantum control pulse. This quantum control pulse is an electromagnetic RF signal that is generated at baseband according to an analog waveform. An application circuit digitally generates samples of this analog waveform. These waveform samples are further modified according to post-processing instructions. To avoid processing gaps, the waveform samples and the modification instructions are maintained in buffers that are accessed independently. To maintain coherency, the waveform samples and the modification instructions are read simultaneously by an execution controller.

Abstract: Quantum algorithms are performed via a quantum computer, by generating a quantum control pulse in a quantum controller and transmitting the quantum control pulse to a quantum processor. The quantum control pulse interacts with a qubit in the quantum processor. Within the quantum controller, a pulse processor generates a plurality of raw pulses that are modified by a front end hardware module. During the normal operation of the quantum controller, samples of the raw and/or modified pulses may be selected and saved to memory. During a design for validation (DFV) mode, the proper operation of the quantum controller is determined according to a simulation of the quantum controller and the saved samples. The DFV mode may be performed in parallel with normal operation without affecting the resources of the quantum controller.

Abstract: Methods and systems for classical processing in a quantum controller.

Abstract: Circuitry of a pulse generation program compiler is operable to parse pulse generation program source code comprising a declaration of a non-stream variable, a declaration of a stream variable, and one or more stream processing statements that reference the stream variable. The circuitry of the pulse generation program compiler is operable to generate, based on the declaration of the non-stream variable, a machine for execution by a quantum controller and a quantum orchestration server.

Abstract: A quantum orchestration platform (QOP) comprises a collection of processing units and analog components that produce synchronized analog pulses, readouts, and computations that may be used for operations with qubits. All processing units of the QOP are synchronized with minimal skew via time processing over one or more sync cables that interconnect the processing units.

Abstract: This disclosure describes an auto-calibration of mixers in a quantum orchestration platform. Predistortion is computed according to an RF signal that is downconverted with a local oscillator tone that is offset from an upconverter tone. Three tones present in the original RF signal are distinguished and used to construct a cost function. The minimization of the cost function is used to cancel an unwanted LO leakage and an image tone. Because the quantum orchestration platform generates both the unconverted IQ signals and the cost function for their optimization, the optimization can be performed in real time inside a single device without the need to communicate with external devices. This allows for the optimization of single sideband upconverted signals in a fraction of the time it typically takes using distributed systems employing separate waveform generators and spectrum analyzers.

Abstract: A system comprises quantum control interconnect circuitry configured to receive a plurality of fixed-frequency signals, a variable-frequency signal, a quantum control pulse, a quantum element readout pulse, and a quantum element return pulse. The circuitry is operable to upconvert the quantum control pulse using the fixed-frequency signals. The circuitry is operable to upconvert the readout pulse using the variable-frequency signal. The circuitry is operable to downconvert the return pulse using the variable-frequency signal.

Abstract: A system comprises an electromagnetic pulse generation system that comprises a first pulse generation circuit, a second pulse generation circuit, and a mixing circuit. The electromagnetic pulse generation system is operable to output a first pulse generated by the first pulse generation circuit onto a first signal path, output a second pulse generated by the second pulse generation circuit onto the first signal path, generate a third pulse by mixing, via the mixing circuit, a fourth pulse generated by the first pulse generation circuit and a fifth pulse generated by the second pulse generation circuit, and output the third pulse on the first signal path.

Abstract: A set of quantum controllers are operable to transmit quantum state data to a quantum control switch. The quantum control switch comprises vector processors that operate on the quantum state data from the set of quantum controllers. Each vector processor transmits a result of the operation to a corresponding quantum controller in the set of quantum controllers.

Abstract: A feedback controller is provided to generate a quantum feedback operation to control one or more ancilla qubits in a quantum error correcting code. The quantum feedback operation is based on the measurement of the one or more ancilla qubits. The feedback controller is operable to dynamically adjust a state discrimination according to previous measurements of the one or more ancilla qubits.