Quantum architecture biasing scheme
AssigneeInternational Business Machines Corporation
InventorMatthew Beck
Life of this patent
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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.
Claims20
A radio-frequency (RF) to direct current (DC) converter comprising:
- a Josephson junction (JJ);
- a direct electrical current (DC) to single flux quantum (SFQ) converter connected to the JJ, wherein the DC to SFQ converter provides for switching action of the JJ by transmitting SFQ pulses to the JJ;
- and
- a rapid single flux quantum (RSFQ) pulse doubler that is connected to the DC to SFQ converter and that generates SFQ pulse current to the DC to SFQ converter for affecting the JJ,
- wherein the DC to SFQ converter transmits the SFQ pulses having been, at least in part, generated by the DC to SFQ converter by converting RF current, and having been, at least in part, received from the RSFQ pulse doubler.
A quantum mechanical system comprising:
- a radio-frequency (RF) to direct current (DC) converter comprising:
- a Josephson junction (JJ),
- a direct electrical current (DC) to single flux quantum (SFQ) converter connected to the JJ, wherein the DC to SFQ converter provides for switching action of the JJ by transmitting SFQ pulses to the JJ,
- a rapid single flux quantum (RSFQ) pulse doubler that is connected to the DC to SFQ converter and that generates SFQ pulse current to the DC to SFQ converter for affecting the JJ,
- a resistor connected to the JJ;
- and
- a quantum mechanical device connected to the resistor, wherein an RF current passing through the resistor is directed to the quantum mechanical device, wherein an electrical current flow through the resistor to the quantum mechanical device comprises an RF frequency directly dependent on an RF frequency of RF electrical current applied from an external RF source to the DC to SFQ converter.
A quantum mechanical system comprising:
- a plurality of bipolar quantized supercurrent generators (QSGs);
- and
- a plurality of quantum mechanical devices,
- wherein each of the plurality of quantum mechanical devices are inductively coupled to a corresponding one of the plurality of QSGs, and
- the plurality of QSGs are addressable so that input single flux quantum (SFQ) pulses are routed to a respective specified QSG of the plurality of QSGs.
Dependencies are inferred from the claim text.