International Business Machines Corporation

Nicholas A Masluk

Jay Michael Gambetta

Jerry M Chow

Matthias Steffen

David William Abraham

Nicholas Torleiv Bronn

John Michael Cotte

A transmission structure includes a first conductor and a second conductor interwoven with the first conductor. A plurality of portions of the first conductor pass through a corresponding plurality of openings in the second conductor. A plurality of portions of the second conductor pass through a corresponding plurality of openings in the first conductor.

Transmission structure including interwoven electrical conductors

A thermal radiation shield interface for cryogenic systems includes a first element with a distal, free end. Flanges project from the distal, free end of the first element. A second element also includes a distal, free end. Flanges project from the distal, free end of the second element. The flanges of the first element and the flanges of the second element are positioned in an interleaved arrangement to cover an opening between the first element and the second element shielding the opening from radiation leakage.

Non-contact thermal radiation shield interface

A cryogenic electronics device includes a semiconductor chip. A substrate is flip-chip bonded to the semiconductor chip. A plurality of bump bonds are concentrated in a bump region of the semiconductor chip. A plurality of circuit elements are arranged in a predefined region of the semiconductor chip. The predefined region and the bump region are separate regions.

Electrical connections between dissimilar materials at cryogenic temperatures

Systems and techniques that facilitate high-density embedded broadside-coupled attenuators are provided. In various embodiments, an attenuator can comprise an output line. In various aspects, the attenuator can further comprise a reflectively-terminated input line that is broadside coupled to the output line. In various instances, a downstream end of the reflectively-terminated input line can be shorted to ground. In other instances, a downstream end of the reflectively-terminated input line can be open from ground. In various cases, the output line can exhibit a non-looped-back-layout.

High-density embedded broadside-coupled attenuators

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 technique relates to a superconductor tunable notch filter. A Josephson junction filter array is connected to a coupling pad and connected to ground. The Josephson junction filter array includes a filter inductance. The Josephson junction filter array connected to the coupling pad forms a filter capacitance. A Josephson junction bias array is connected to the coupling pad and connected to a current source. The Josephson junction bias array includes a bias inductance. A transmission line is connected to the coupling pad in which connection of the transmission line and the coupling pad forms a coupling capacitance, such that the filter inductance and the filter capacitance connect to the transmission line through the coupling capacitance. The Josephson junction filter array includes a notch filter frequency that is tunable according to a magnitude of a current bias from the current source.

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Putnam Valley, NY, United States of America

Nicholas A Masluk