Rigetti & Co, LLC

Dane Christoffer Thompson

Chad Tyler Rigetti

William J Zeng

Eyob Alebachew Sete

Mehrnoosh Vahidpour

Matthew J Reagor

Jean-Luc François-Xavier Orgiazzi

Alexei N Marchenkov

Alexei N Marchenokov

Shane Arthur Caldwell

Michael Karunendra Selvanayagam

Mehmoosh Vahidpour

Richard Maydra

In some aspects, a quantum computing system includes a multi-dimensional array of qubit devices. Coupler devices reside at intervals between neighboring pairs of the qubit devices in the multi-dimensional array. Each coupler device is configured to produce an electromagnetic interaction between one of the neighboring pairs of qubit devices. In some cases, each qubit device has a respective qubit operating frequency that is independent of an offset electromagnetic field experienced by the qubit device, and the coupling strength of the electromagnetic interaction provided by each coupler device varies with an offset electromagnetic field experienced by the coupler device. In some cases, readout devices are each operably coupled to a single, respective qubit device to produce qubit readout signals that indicate the quantum state of the qubit device.

Operating a multi-dimensional array of qubit devices

In some aspects, a heterogeneous computing system includes a quantum processor unit and a classical processor unit. In some instances, variables defined by a computer program are stored in a classical memory in the heterogeneous computing system. The computer program is executed in the heterogeneous computing system by operation of the quantum processor unit and the classical processor unit. Instructions are generated for the quantum processor by a host processor unit based on values of the variables stored in the classical memory. The instructions are configured to cause the quantum processor unit to perform a data processing task defined by the computer program. The values of the variables are updated in the classical memory based on output values generated by the quantum processor unit. The classical processor unit processes the updated values of the variables.

Operating a quantum processor in a heterogeneous computing architecture

A quantum computing system that includes a quantum circuit device having at least one operating frequency; a first substrate having a first surface on which the quantum circuit device is disposed; a second substrate having a first surface that defines a recess of the second substrate, the first and second substrates being arranged such that the recess of the second substrate forms an enclosure that houses the quantum circuit device; and an electrically conducting layer that covers at least a portion of the recess of the second substrate.

Microwave integrated quantum circuits with vias and methods for making the same

Microwave integrated quantum circuits with cap wafer and methods for making the same

In some aspects, a quantum computing system includes an electromagnetic waveguide system. The waveguide system has an interior surface that defines an interior volume of intersecting waveguides. Qubit devices are housed in the waveguide system. In some cases, the intersecting waveguides each define a cutoff frequency, and the qubit devices have qubit operating frequencies below the cutoff frequency. In some cases, coupler devices are housed in the waveguide system; each coupler device is configured to selectively couple a pair of neighboring qubit devices based on control signals received from a control source.

Housing qubit devices in an electromagnetic waveguide system

In some aspects, a quantum computing system includes a control system and a quantum processor cell. The control system generates quantum processor control information for a group of devices housed in the quantum processor cell, and each device in the group has a distinct operating frequency. In some cases, a waveform generator generates a multiplexed control signal based on the quantum processor control information, and the multiplexed control signal is communicated an input signal processing system. In some cases, the input signal processing system includes an input channel configured to receive the multiplexed control signal, a de-multiplexer configured to separate device control signals from the multiplexed control signal, and output channels configured to communicate the respective device control signals into the quantum processor cell.

Processing signals in a quantum computing system

A quantum computing system includes a quantum circuit device, a substrate having a first surface on which the quantum processing device is disposed, and one or more vias each extending through the substrate. The vias include a material that is a superconducting material during operation of the quantum computing system.

Microwave integrated quantum circuits with VIAS and methods for making the same

In some aspects, a quantum information processing circuit includes a lumped-element device on the surface of a dielectric substrate. The lumped-element device can include a capacitor pad and an inductive transmission line. The capacitor pad can be capacitively coupled to another capacitor pad. The inductive transmission line can reside in an interior clearance area defined by an inner boundary of the capacitor pad. The lumped-element device can be, for example, a resonator device or a filter device. The inductive transmission line can be, for example, a meander inductor.

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Dane Christoffer Thompson