International Business Machines Corporation

Government of the United States of America, As Represented by the Secretary of Commerce

Raytheon Bbn Technologies Corp.

Glocbalfoundries Inc.

Matthias Steffen

Jay Michael Gambetta

Jerry M Chow

George Andrew Keefe

Oliver Dial

Antonio D Corcoles Gonzalez

Chad Tyler Rigetti

Douglas T McClure, Iii

David William Abraham

Mary Beth Rothwell

Shwetank Kumar

Mark B Ketchen

James Robert Rozen

Easwar Magesan

Maika Takita

Nicholas A Masluk

Isaac Lauer

Nicholas Torleiv Bronn

Matthew J Farinelli

Seth T Merkel

David C Mckay

Abhinav Kandala

Jiri Stehlik

Chang Chyi Tsuei

David Zajac

David P Pappas

Christopher B Lirakis

Devin L Underwood

Devin Underwood

Jiansong Gao

David S Wisbey

Richard Lazarus

Dustin A Hite

Michael R Vissers

Stefano Poletto

David DiVincenzo

Lattice arrangements for quantum qubits are described. A lattice arrangement can comprise adjacent structures having vertices connected by edges. The qubits can be positioned on the vertices. A qubit in the lattice arrangement directly connects to not more than three other qubits, or connects to another qubit via a coupling qubit on an edge between two qubits on a vertex. The adjacent structures can comprise hexagons, dodecagons or octagons. A superconducting qubit lattice can comprise superconducting target qubits and superconducting control qubits. The superconducting qubit lattice can comprise adjacent structures having vertices connected by edges, with target qubits positioned on the vertices and control qubits positioned on the edges. Logic operations between adjacent superconducting target and control qubits can be implemented by driving the superconducting control qubit at or near the frequency of the superconducting target qubit.

Reducing qubit frequency collisions through lattice design

Devices and/or computer-implemented methods to facilitate a quantum gate between qubits using a tunable coupler and a capacitor device are provided. According to an embodiment, a quantum coupler device can comprise a tunable coupler coupled between terminals of a same polarity of a first qubit and a second qubit, the tunable coupler configured to control a first coupling between the first qubit and the second qubit. The quantum coupler device can further comprise a capacitor device coupled to terminals of an opposite polarity of the first qubit and the second qubit, the capacitor device configured to provide a second coupling that is opposite in sign relative to the first coupling.

Tunable quantum coupler facilitating a quantum gate between qubits

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.

Architecture for coupling quantum bits using localized resonators

A mechanism relates a superconductor circuit. A &#x394; circuit includes a first node connecting a Purcell capacitor to a qubit coupling capacitor, a second node connecting the Purcell capacitor to a readout coupling capacitor, and a third node connecting the qubit coupling capacitor to the readout coupling capacitor. A qubit is connected to the first node and has a qubit frequency. A readout resonator connects to the third node combining with the Purcell capacitor to form a filter. Capacitance of the Purcell capacitor is determined as a factor of the qubit frequency of the qubit and blocks emissions of the qubit at the qubit frequency. Capacitance of the Purcell capacitor causes destructive interference, between a first path containing Purcell capacitor and a second path containing both the qubit coupling capacitor and readout coupling capacitor, in order to block emissions of the qubit at the qubit frequency to the external environment.

Reducing spontaneous emission in circuit quantum electrodynamics by a combined readout and filter technique

A coplanar waveguide device includes a coplanar waveguide structure disposed on a substrate, at least one qubit coupled to the coplanar waveguide structure and an add-on chip having a metallized trench, and disposed over the substrate.

Removal of spurious microwave modes via flip-chip crossover

Method of fabricating a coplanar waveguide device including removal of spurious microwave modes via flip-chip crossover

Growing community of inventors

Cortlandt Manor, NY, United States of America

Matthias Steffen