Abstract: A system can comprise a memory that can store computer-executable components and a processor that can execute the computer-executable components stored in the memory, wherein the computer-executable components can comprise a circuit transpiler unit that can identify respective placement of one or more mid-circuit measurements and one or more classically controlled feed-forward operations on a quantum circuit. The computer-executable components can further comprise a circuit transpiler unit that can identify respective placement of one or more mid-circuit measurements and one or more classically controlled feed-forward operations on a quantum circuit. The computer-executable components can further comprise a circuit twirling unit that can create twirled layers of circuit instructions by twirling respective classical bits controlling the one or more classically controlled feed-forward operations.

Abstract: A method, system and computer program product for generating optimal samples in quantum optimization algorithms. A quantum error mitigation technique is used to generate samples of a resulting probability distribution from random quantum circuits. Examples of such quantum error mitigation techniques include probabilistic error cancellation (PEC) and zero noise extrapolation (ZNE). An objective (ƒ(x)) for every generated sample (|x) is then computed. A conditional value at risk (CVaR) at a particular level of the computed objective functions corresponding to an optimal sample in a quantum optimization algorithm, such as a variational quantum optimization algorithm, is then computed. In this manner, optimal samples in quantum optimization algorithms are generated using quantum error mitigation techniques, such as probabilistic error cancellation and zero noise extrapolation.

Abstract: A quantum noise mitigation system can comprise a memory that stores, and a processor that executes, computer executable components comprising a pulse calibration component that, for controlling execution of a quantum gate of a quantum circuit, calibrates an echo extender tone parameter for a set of echo extender tones of an echo pulse sequence, wherein the pulse calibration component inserts the set of echo extender tones into the echo pulse sequence of an initial pulse sequence resulting in generation of a modified pulse sequence for use in controlling the execution of the quantum gate, and a parameterizing component that parameterizes the set of echo extender tones using a scalable stretch factor for stretching respective durations of the set of echo extender tones.

Abstract: A method, computer system, and a computer program product for a resource-efficient pulse-based variational quantum circuit running on a selected quantum hardware to solve a given predefined problem. The present invention may include controlling an execution of a plurality of different quant controlling an execution of a plurality of different quantum circuits using the selected quantum hardware for the given predefined problem to be solved, evaluating a performance of each of the plurality of different quantum circuits, selecting a best performing one of the plurality of quantum circuits, generating a pulse sequence having a pulse schedule tailored to the selected quantum hardware and the given problem for the best performing one of the plurality of the different quantum circuits, and determining a simplified pulse schedule of the pulse sequence, thereby producing an efficient pulse-based schedule that acts as a pulse-based variational form for the best performing quantum circuit.

Abstract: The present disclosure relates to a quantum system of dimension M comprising a transmon device. The transmon device is in an initial state ?ini which is restricted to a state ?S of a N-dimensional quantum system embedded in the quantum system, where N<M. The transmon device is configured to receive a sequence of pulses for transforming the initial state ?ini to a state ?ext of the quantum system. The transmon device is connected to a readout that is configured to perform a projection-valued measure (PVM) of the transmon device in its state ?ext.

Abstract: Techniques regarding quantum computer error mitigation are provided. For example, one or more embodiments described herein can comprise a system, which can comprise a memory that can store computer executable components. The system can also comprise a processor, operably coupled to the memory, and that can execute the computer executable components stored in the memory. The computer executable components can comprise an error mitigation component that interpolates a gate parameter associated with a target stretch factor from a reference model that includes reference gate parameters for a quantum gate calibrated at a plurality of reference stretch factors.

Abstract: Techniques regarding quantum error mitigation are provided. For example, one or more embodiments described herein can comprise a system, which can comprise a memory that can store computer executable components. The system can also comprise a processor, operably coupled to the memory, and that can execute the computer executable components stored in the memory. The computer executable components can comprise an error mitigation component that can add a set of scaled quantum gates to a quantum circuit for error mitigation. The set of scaled quantum gates can comprise a quantum gate and an inverse of the quantum gate. Also, the set of scaled quantum gates can have a rotation angle based on a pulse schedule to achieve a target stretch factor.