A method includes causing activation, at a first time, of a first set of squeezed light sources from a plurality of squeezed light sources of a Gaussian boson sampling (GBS) circuit. At a second time after the first time, a first photon statistic is detected at a first output port from a plurality of output ports of the GBS circuit. At a third time after the first time, a second set of squeezed light sources from the plurality of squeezed light sources of the GBS circuit is activated, the second set of squeezed light sources being different from the first set of squeezed light sources. At a fourth time after the third time, a second photon statistic is detected at a second output port from the plurality of output ports of the GBS circuit. At least one transformation matrix is estimated that represents a linear optical interferometer of the GBS circuit based on the first photon statistic and the second photon statistic.

A method includes causing activation, at a first time, of a first set of squeezed light sources from a plurality of squeezed light sources of a Gaussian boson sampling (GBS) circuit. At a second time after the first time, a first photon statistic is detected at a first output port from a plurality of output ports of the GBS circuit. At a third time after the first time, a second set of squeezed light sources from the plurality of squeezed light sources of the GBS circuit is activated, the second set of squeezed light sources being different from the first set of squeezed light sources. At a fourth time after the third time, a second photon statistic is detected at a second output port from the plurality of output ports of the GBS circuit. At least one transformation matrix is estimated that represents a linear optical interferometer of the GBS circuit based on the first photon statistic and the second photon statistic.

Aspects of the present disclosure describe a method including compressing and uncompressing redundant quantum information encoded in quantum computers; processing quantum information in the compressed space; and computing, in response to determining the ansatz terms, a set of optimal transformations.

Aspects of the present disclosure describe a method including compressing and uncompressing redundant quantum information encoded in quantum computers; processing quantum information in the compressed space; and computing, in response to determining the ansatz terms, a set of optimal transformations.

It is determined that a first quantum process is to be initiated and will utilize a first quantity of qubits. Quantum computing system (QCS) metadata is accessed that identifies a plurality of QCSs and, for each respective QCS in the plurality of QCSs, a plurality of qubits implemented by the respective QCS. Based on the QCS metadata, a set of QCSs from the plurality of QCSs is selected to form a first distributed QCS. A set of qubits implemented by the QCSs in the set of QCSs is selected. Distributed QCS information is sent to each QCS in the set of QCSs, the distributed QCS information identifying one QCS in the set of QCSs as a primary QCS.

It is determined that a first quantum process is to be initiated and will utilize a first quantity of qubits. Quantum computing system (QCS) metadata is accessed that identifies a plurality of QCSs and, for each respective QCS in the plurality of QCSs, a plurality of qubits implemented by the respective QCS. Based on the QCS metadata, a set of QCSs from the plurality of QCSs is selected to form a first distributed QCS. A set of qubits implemented by the QCSs in the set of QCSs is selected. Distributed QCS information is sent to each QCS in the set of QCSs, the distributed QCS information identifying one QCS in the set of QCSs as a primary QCS.

A device includes: a plurality of qubits arranged in a two-dimensional array and a plurality of readout resonators. Each readout resonator of a first readout resonator group is arranged to electromagnetically couple to a respective qubit of a first qubit group. Each readout resonator of a second readout resonator group is arranged to electromagnetically couple to a respective qubit of a second qubit group. A resonance frequency of each readout resonator of the first readout resonator group is within a first resonance frequency band, and a resonance frequency of each readout resonator of the second readout resonator group is within a second resonance frequency band that is different from the first resonance frequency band.

A semiconductor-ferromagnetic insulator-superconductor hybrid device comprises a semiconductor component, a ferromagnetic insulator component, and a superconductor component. The semiconductor component has at least three facets. The ferromagnetic insulator component is arranged on a first facet and a second facet. The superconductor component is arranged on a third facet and extends over the ferromagnetic insulator component on at least the second facet. The device is useful for generating Majorana zero modes, which are useful for quantum computing. Also provided are a method of fabricating the device, and a method of inducing topological behaviour in the device.

A semiconductor-ferromagnetic insulator-superconductor hybrid device comprises a semiconductor component, a ferromagnetic insulator component, and a superconductor component. The semiconductor component has at least three facets. The ferromagnetic insulator component is arranged on a first facet and a second facet. The superconductor component is arranged on a third facet and extends over the ferromagnetic insulator component on at least the second facet. The device is useful for generating Majorana zero modes, which are useful for quantum computing. Also provided are a method of fabricating the device, and a method of inducing topological behaviour in the device.

A detector for reading out a state of a qubit includes a flux qubit and a flux bias generator. The flux qubit includes an inductor and SQUID loop, in which the flux qubit is arranged to exhibit first and second flux states. The flux bias generator generates a first flux bias through the inductor and a second flux bias through the SQUID loop, such that, in response to a first value of the first flux bias, the energies of the first and the second flux states are substantially identical and, in response to a second value of the first flux bias, the energies of the first and the second flux states are different. In response to a first value of the second flux bias, the flux qubit couples to the qubit and, in response to a second value of the second flux bias, decouples from the qubit and suppresses tunneling.