SYSTEMS AND METHODS FOR IMPROVING THE PERFORMANCE OF A QUANTUM PROCESSOR VIA REDUCED READOUTS

摘要

Techniques for improving the performance of a quantum processor are described. The techniques include reading out a fraction of the qubits in a quantum processor and utilizing one or more post-processing operations to reconstruct qubits of the quantum processor that are not read. The reconstructed qubits may be determined using a perfect sampler to provide results that are strictly better than reading all of the qubits directly from the quantum processor. The composite sample that includes read qubits and reconstructed qubits may be obtained faster than if all qubits of the quantum processor are read directly.

主权项

1. A computational system comprising:
at least one quantum processor comprising:
a plurality of qubits including a first set of qubits and a second set of qubits;a plurality of coupling devices, wherein each coupling device provides controllable communicative coupling between two of the plurality of qubits;a first readout subsystem responsive to a state of each of the qubits in the first set of qubits to generate a first set of detected samples, each detected sample in the first set of detected samples represents a respective one of the qubits in the first set of qubits; at least one post-processing processor-based device communicatively coupled to the at least one quantum processor; and at least one non-transitory computer-readable storage medium communicatively coupled to the at least one post-processing processor-based device and that stores at least one of processor-executable instructions or data, where in use the at least one post-processing processor-based device:
receives the first set of detected samples that represents the qubits in the first set of qubits; andpost-processes the first set of detected samples to generate a first set of derived samples, wherein each sample in the first set of derived samples represents a respective one of the qubits in the second set of qubits.