International Business Machines Corporation

Oliver Dial

Matthias Steffen

Jay Michael Gambetta

Douglas T McClure, Iii

Muir Kumph

David C Mckay

Isaac Lauer

David William Abraham

John Michael Cotte

Aaron Finck

April Carniol

Kevin Shawn Petrarca

Antonio Corcoles-Gonzalez

Abhinav Kandala

Maika Takita

John Blair

John Ray Blair

Jiri Stehlik

Jonathan Allen Wildstrom

David Lokken-Toyli

Devin Underwood

A quantum circuit device includes a qubit chip including a plurality of qubits and a plurality of flux tunable couplers. A plurality of fixed frequency qubits are arranged in in a lattice structure, wherein each pair of the plurality of fixed frequency qubits is coupled to one flux tunable coupler. A wiring layer is coupled to the qubit chip, and the wiring layer includes a loop constructed of a superconducting material that is inductively coupled to the flux tunable couplers. A flux bias line is constructed of a superconducting material that is different than the superconducting material of the loop, wherein the flux bias line is inductively coupled to both the loop and the flux tunable couplers.

Generating DC offsets in flux-tunable transmons with persistent current loops

A quantum computing chip device provides an edge based capacitive, intra-chip connection. A first chip includes a first signal line with a distal end positioned proximate to or on an edge of the first chip and a proximal end positioned away from the edge of the first chip. A second chip includes a second signal line with a distal end positioned proximate to or on an edge of the second chip and a proximal end positioned away from the edge of the second chip. The first signal line and the second signal line are configured to conduct a signal. The second signal line of the second chip is disposed in alignment for a capacitive bus connection to the first signal line of the first chip.

Edge capacitive coupling for quantum chips

Devices and/or computer-implemented methods to facilitate ZZ cancellation between qubits are provided. According to an embodiment, a device can comprise a coupler device that operates in a first oscillating mode and a second oscillating mode. The device can further comprise a first superconducting qubit coupled to the coupler device based on a first oscillating mode structure corresponding to the first oscillating mode and based on a second oscillating mode structure corresponding to the second oscillating mode. The device can further comprise a second superconducting qubit coupled to the coupler device based on the first oscillating mode structure and the second oscillating mode structure.

Quantum coupler facilitating suppression of ZZ interactions between qubits

A semiconductor device comprises a first chip layer, having a first chip layer front-side and a first chip layer back-side, a qubit chip layer, having a qubit chip layer front-side and a qubit chip layer back-side, the qubit chip layer front-side operatively coupled to the first chip layer front-side with a set of bump-bonds, a set of through-silicon vias (TSVs) connected to at least one of: the first chip layer back-side or the qubit chip layer back-side and a cap wafer metal bonded to at least one of: the qubit chip layer back-side or the first chip layer back-side.

Create a protected layer for interconnects and devices in a packaged quantum structure

Techniques regarding qubit coupling structures that enable RIP gates are provided. For example, one or more embodiments described herein can comprise an apparatus that can include a coupling structure coupled to a first qubit and a second qubit. The coupling structure can have a plurality of coupling pathways. A coupling pathway from the plurality of coupling pathways can be a resonator. Also, the first qubit can be coupled to a first end of the resonator, and the second qubit can be coupled to a point along a length of the resonator.

Multimode resonators for resonator induced phase gates

Systems and techniques that facilitate strategic pausing for quantum state leakage mitigation are provided. In various embodiments, a system can comprise a detection component that can detect a quantum state leakage associated with one or more qubits. In various aspects, the system can further comprise a pause component that can, in response to detecting the quantum state leakage, generate a time pause prior to execution of a quantum circuit on the one or more qubits. In various embodiments, the pause component can generate the time pause after execution of a previous quantum circuit on the one or more qubits, where the quantum state leakage arises during the execution of the previous quantum circuit. In some cases, the quantum state leakage can decay during the time pause.

Strategic pausing for quantum state leakage mitigation

Systems, computer-implemented methods, and computer program products to facilitate approximating a range of sideband frequencies efficiently are provided. According to an embodiment, a system can comprise a processor that executes computer executable components stored in memory. The computer executable components comprise a wave division component that generates a plurality of waveform snippets using a definition of an intended waveform, wherein the plurality of waveform snippets can be phase shifted. The computer executable components further comprise rotation component that assigns a phase rotation to be applied to at least one waveform snippet of the plurality of waveform snippets, wherein the phase rotation is out of phase with a previous waveform snippet of the plurality of waveform snippets.

Approximation of a range of sideband frequencies efficiently

Techniques regarding resetting highly excited qubits 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 reset component that can de-excite a qubit system to a target state by transitioning a population of a first excited state of the qubit system to a ground state and by applying a signal to the qubit system that transitions a population of a second excited state to the first excited state.

Qubit reset from excited states

Techniques facilitating dynamic control of ZZ interactions for quantum computing devices. In one example, a quantum coupling device can comprise a biasing component that is operatively coupled to first and second qubits via respective first and second drive lines. The biasing component can facilitate dynamic control of ZZ interactions between the first and second qubits using off-resonant microwave signals applied via the respective first and second drive lines.

All microwave ZZ control

A technique relates a superconducting microwave cavity. An array of posts has different heights in the cavity, and the array supports a localized microwave mode. The array of posts includes lower resonant frequency posts and higher resonant frequency posts. The higher resonant frequency posts are arranged around the lower resonant frequency posts. A first plate is opposite a second plate in the cavity. One end of the lower resonant frequency posts is positioned on the second plate so as to be electrically connected to the second plate. Another end of the lower resonant frequency posts in the array is open so as not to form an electrical connection to the first plate. Qubits are connected to the lower resonant frequency posts in the array of posts, such that each of the qubits is physically connected to one or two of the lower resonant frequency posts in the array of posts.

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Yorktown Heights, NY, United States of America

Oliver Dial