公开(公告)号：US11876512B1

公开(公告)日：2024-01-16

申请号：US17871933

申请日：2022-07-23

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor： Matthew Beck

IPC: H03K17/92 ,  H03K3/01

CPC classification number: H03K17/92 ,  H03K3/01

Abstract: A method of using Josephson Junctions to convert the envelope of radio-frequency signals into baseband control pulses includes injecting a biasing current into an envelope detector circuit. The biasing current is identified based on first and second critical currents of superconducting devices in the envelope detector circuit. The first critical current corresponds to the envelope detector circuit receiving no RF signals. The second critical current corresponds to the envelope detector circuit receiving maximum RF signals. The method further includes receiving a modulated radio frequency (RF) signal at the envelope detector circuit to detect an envelope of the received RF signal. The output of the envelope detector circuit is used to drive an output load. The output is generated based on the detected envelope by the envelope detector circuit.

公开(公告)号：US20230068621A1

公开(公告)日：2023-03-02

申请号：US18046994

申请日：2022-10-17

Applicant: International Business Machines Corporation

Inventor： Matthew Beck

IPC: G01R33/035 ,  G06N10/00 ,  H01L39/22 ,  H03F19/00 ,  H03K3/38 ,  H03K17/92 ,  H03K5/00 ,  G06N10/40

Abstract: A radio-frequency (RF) to direct current (DC) converter is provided. When a DC electrical current is applied via a DC input port of the converter, the DC electrical current is shunted to ground through a Josephson junction (JJ) of the converter and substantially no DC electrical current flows through a resistor of the converter, and when an RF electrical current is applied via an RF input port of the converter, output trains of SFQ current pulses from a DC to SFQ converter of the RF-to-DC converter with pulse-to-pulse spacing inversely proportional to the RF electrical current frequency cause the JJ to switch at a rate commensurate with an RF frequency of the RF electrical current to generate a steady state voltage across the JJ linearly dependent on the RF frequency.

公开(公告)号：US11411564B2

公开(公告)日：2022-08-09

申请号：US17118526

申请日：2020-12-10

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor： Matthew Beck ,  John Timmerwilke

IPC: H03K19/195 ,  H03K3/38

Abstract: A method of generating an output signal based on a single flux quantum (SFQ) pulse includes receiving the SFQ pulse and splitting it into a first path and a second path. The split SFQ pulse of the second path is stored in a latch. A second splitting of the split SFQ pulse of the first path is provided to provide a first output signal and a second output signal of the first path. The second output signal is delayed by a delay Josephson transmission line (JTL). An output of the delay JTL is provided as a clock input to the latch. The first output of the first path is recombined with an output of the latch to provide an output signal.

公开(公告)号：US11362656B1

公开(公告)日：2022-06-14

申请号：US17513831

申请日：2021-10-28

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor： Matthew Beck ,  Daniel Joseph Friedman

IPC: H03K17/92

Abstract: A single flux quantum (SFQ) circuit includes a radio frequency (RF) to direct current (DC) conversion stage. A DC to RF current conversion stage is coupled to a single output of the RF to DC conversion stage. The DC to RF current conversion stage includes a plurality of series stacked Josephson Junctions (JJs) having n stages, configured to convert a DC current received from the RF to DC conversion stage and reconvert the DC current to an RF tone.

公开(公告)号：US20220115577A1

公开(公告)日：2022-04-14

申请号：US17067518

申请日：2020-10-09

Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

Inventor： Matthew Beck ,  Joseph Allen Glick

IPC: H01L39/02 ,  H01L39/22

Abstract: A superconducting circuit includes a first port and a plurality of second ports; a plurality of filter poles, each filter pole comprising an inductor and a capacitor connected in parallel, between the first port and a second port in the plurality of second ports; an admittance inverter comprising at least one of a coupling capacitor, a coupling inductor, and a Josephson junction, the admittance inverter linking two successive filter poles together. The plurality of filter poles and associated admittance inverters define a plurality of current branches so that, when operating as a demultiplexer, an input electrical current input though the first port is routed to a selected one of the plurality of the plurality of second ports by an application of a first set of magnetic flux biases.

公开(公告)号：US20220108200A1

公开(公告)日：2022-04-07

申请号：US17060809

申请日：2020-10-01

Applicant: International Business Machines Corporation

Inventor： Joseph Robert Suttle ,  Matthew Beck

IPC: G06N10/00 ,  H01L39/22 ,  H01L39/02

Abstract: Techniques facilitating a quantum gate between qubits using a tunable coupler are provided. In one example, a quantum coupler device can comprise a Josephson ring modulator (JRM) that is operatively coupled to first and second qubits in a balanced bridge topology via respective first and second capacitive devices. The JRM provides tunable coupling between the first and second qubits.