International Business Machines Corporation

Juelich Research Center

Firat Solgun

Markus Brink

Jay Michael Gambetta

Dongbing Shao

Sami Rosenblatt

Antonio Corcoles-Gonzalez

Martin O Sandberg

Jared Barney Hertzberg

Salvatore Bernardo Olivadese

Hanhee Paik

David P DiVincenzo

Jerry M Chow

Vivekananda P Adiga

George Andrew Keefe

John Blair

Srikanth Srinivasan

Thomas George McConkey

Devices and/or computer-implemented methods to facilitate a multipole filter on a quantum device with multiplexing capability and signal separation to mitigate crosstalk are provided. According to an embodiment, a device can comprise an interposer substrate comprising a readout resonator. The device can further comprise a qubit chip substrate comprising a qubit coupled to the readout resonator and to a multipole filter.

Multipole filter on a quantum device with multiplexing and signal separation

Techniques and a system for quantum computing device modeling and design are provided. In one example, a system includes a modeling component and a simulation component. The modeling component models a quantum device element of a quantum computing device as an electromagnetic circuit element to generate electromagnetic circuit data for the quantum computing device. The simulation component simulates the quantum computing device using the electromagnetic circuit data to generate response function data indicative of a response function for the quantum computing device. Additionally or alternatively, a Hamiltonian is constructed based on the response function.

Quantum computing device design

A system includes a first quantum circuit plane that includes a first qubit, a second qubit and a third qubit. A coupled-line bus is coupled between the first qubit and the second qubit. A second circuit plane is connected to the first quantum circuit plane, comprising a control line coupled to the third qubit. The control line and the coupled-line bus are on different planes and crossing over each other, and configured to mitigate cross-talk caused by the crossing during signal transmission.

Coupled-line bus to suppress classical crosstalk for superconducting qubits

A quantum computing device includes a first chip having a first substrate and one or more qubits disposed on the first substrate. Each of the one or more qubits has an associated resonance frequency. The quantum computing device further includes a second chip having a second substrate and at least one conductive surface disposed on the second substrate opposite the one or more qubits. The at least one conductive surface has at least one dimension configured to adjust the resonance frequency associated with at least one of the one or more qubits to a determined frequency adjustment value.

Qubit frequency tuning structures and fabrication methods for flip chip quantum computing devices

In an embodiment, a method includes forming a first chip having a first substrate and one or more qubits disposed on the first substrate, each of the one or more qubits having an associated resonance frequency. In an embodiment, the method includes forming a second chip having a second substrate and at least one conductive surface disposed on the second substrate opposite the one or more qubits, the at least one conductive surface having at least one dimension configured to adjust the resonance frequency associated with at least one of the one or more qubits to a determined frequency adjustment value.

Devices, systems, methods, computer-implemented methods, apparatus, and/or computer program products that can facilitate a switch device that shifts frequency of a resonator in a quantum device are provided. According to an embodiment, a device can comprise a readout resonator coupled to a qubit. The device can further comprise a switch device formed across the readout resonator that shifts frequency of the readout resonator based on position of the switch device. According to another embodiment, a device can comprise a bus resonator coupled to a plurality of qubits. The device can further comprise a switch device formed across the bus resonator that shifts frequency of the bus resonator based on position of the switch device.

Switch device facilitating frequency shift of a resonator in a quantum device

Systems, computer-implemented methods, and computer program products to facilitate external port measurement of qubit port responses are provided. According to an embodiment, a computer-implemented method can comprise terminating, by a system operatively coupled to a processor, one or more qubit ports with different electrical connections. The computer-implemented method can also comprise determining, by the system, one or more qubit port responses from external port responses based on the terminating. In some embodiments, the computer-implemented method can further comprise determining, by the system, a multiport admittance function corresponding to at least two of the one or more qubit ports.

External port measurement of qubit port responses

Techniques regarding an autonomous surface participation analysis of one or more superconducting qubits using the boundary element method 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 a simulation component, operatively coupled to the processor, that can analyze a surface participation of a superconducting qubit by discretizing a conductor-dielectric interface and a dielectric-dielectric interface into a plurality of panels.

Surface participation analysis of superconducting qubits with the boundary element method

A technique relates a structure. An inductive element is on a first surface. A capacitive element is on the first surface and a second surface. An interconnect structure is between the first surface and the second surface.

Bumped resonator structure

A technique relates to a structure. A first surface includes an inductive element of a resonator. A second surface includes a first portion of a capacitive element of the resonator and at least one qubit. A second portion of the capacitive element of the resonator is on the first surface.

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Ossining, NY, United States of America

Firat Solgun