International Business Machines Corporation

Douglas T McClure, Iii

Jay Michael Gambetta

Matthias Steffen

Oliver Dial

Josephine B Chang

Youngseok Kim

Don Greenberg

Daniel Josef Egger

Sarah Elizabeth Sheldon

Joel Russell Huffman

Christopher James Wood

Julianna E Murphy

Techniques regarding quantum computer error mitigation 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 an error mitigation component that interpolates a gate parameter associated with a target stretch factor from a reference model that includes reference gate parameters for a quantum gate calibrated at a plurality of reference stretch factors.

Stretch factor error mitigation enabled quantum computers

Systems and methods that address an optimized method to have a visual representation of qubit stochastic errors. A visual representation is generated of qubit stochastic errors that provides a platform to analyze impact on performance of a quantum circuit to facilitate understanding how noise and error impacts circuit results. Stochastic errors accumulated throughout a circuit are visualized using a gradient overlay.

Visual representation of qubit stochastic errors and the impact on performance of a quantum circuit

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 technique relates to protecting a tunnel junction. A first electrode paddle and a second electrode paddle are on a substrate. The first and second electrode paddles oppose one another. A sacrificial shorting strap is formed on the substrate. The sacrificial shorting strap connects the first electrode paddle and the second electrode paddle; The tunnel junction is formed connecting the first electrode paddle and the second electrode paddle, after forming the sacrificial shorting strap. The substrate is mounted on a portion of a quantum cavity. The portion of the quantum cavity is placed in a vacuum chamber. The sacrificial shorting strap is etched away in the vacuum chamber while the substrate is mounted to the portion of the quantum cavity, such that the sacrificial shorting strap no longer connects the first and second electrode paddles. The tunnel junction has been protected from electrostatic discharge by the sacrificial shorting strap.

Sacrificial shorting straps for superconducting qubits

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Rye, NY, United States of America

Douglas T McClure, Iii