8results about "Superconductive amplifiers" patented technology

This application relates to an integrated filtering and amplification device for quantum computing measurement and control, comprising: a device housing, a circuit board, a front-end attenuation component, a front-end bandpass filter component, a microwave amplification component, a rear-end attenuation component, and a rear-end bandpass filter component. The front-end bandpass filter component, the front-end attenuation component, the microwave amplification component, the rear-end attenuation component, and the rear-end bandpass filter component are sequentially connected to the circuit board and are all integrated within the device housing. By integrating a microwave front-end module with a bandpass filter, attenuator, and microwave amplifier, the complexity of external circuitry is greatly reduced. Furthermore, the integrated front-end module is small in size and can be directly integrated into electronic devices, allowing the measurement and control pulses generated from the electronic devices to be directly connected to the dilution refrigerator, greatly simplifying external wiring and improving system reliability.

Disclosed is a method of manufacturing a Josephson travelling wave parametric amplifier, JTWPA (400), which comprises providing, on a substrate (406), a bottom conductive layer (404, 405), a dielectric layer (408), and a top conductive layer (403), the top conductive layer at least partly forming nonlinear inductors (409), top capacitor plates of parallel plate capacitors and / or conductive strips interrupted by nonlinear inductors, wherein the top conductive layer (403) is formed using a single instance of an angled evaporation method. The nonlinear inductors (409) may comprise one or more Josephson junctions, and the bottom conductive layer (404, 405) may form a CPW transmission line structure (402).

A Josephson parametric device is presented that includes an input port, an output port, and a signal path between the input port and the output port. The signal path includes a first section coupled to the input port and having a first passband, a second section coupled to the output port and having a second passband, and a Josephson junction coupling element for parametric coupling between the first and second sections. The Josephson junction coupling element is coupled to and interposed between the first section and the second section. The Josephson junction coupling element is configured such that, in response to the input port receiving a first signal at a first frequency within the first passband and the Josephson junction coupling element receiving a pump tone, the Josephson junction coupling element converts the first signal to a second signal having a second frequency within the second passband.

Output amplifier comprising a stack of compound superconducting quantum interference device (SQUID) output amplifier stages and related methods are provided. A method includes receiving a first pulse train comprising a first plurality of single flux quantum (SFQ) pulses. The method may further include receiving a second pulse train comprising a second plurality of SFQ pulses, where the second pulse train is delayed by a predetermined fraction of a clock cycle relative to the first pulse train. The method may further include using the stack of the plurality of compound SQUID output amplifier stages converting the first plurality of SFQ pulses and the second plurality of SFQ pulses into a voltage waveform, where each of the plurality of compound SQUID output amplifier stages comprises a pair of superconducting quantum interference devices (SQUIDs).

In a general aspect, parametric amplification is performed in a quantum computing system. In some cases, a traveling wave parametric amplifier (TWPA) includes a plurality of Josephson junctions connected in series. The plurality of Josephson junctions includes a first Josephson junction, which includes a first superconducting electrode on a surface of a substrate, a second superconducting electrode that overlaps the first superconducting electrode, and a barrier sandwiched between overlapping sections of the first and second superconducting electrodes. The barrier defines a footprint with a tapered shape over the surface of the substrate.

To present a Josephson parametric device that includes an input port, an output port, and a signal path between the input port and the output port.SOLUTION: A signal path includes a first section coupled to an input port and having a first passband, a second section coupled to an output port and having a second passband, and a Josephson junction coupling element for parametric coupling between the first and second sections. The Josephson junction coupling element is coupled to and interposed between the first and second sections. The Josephson junction coupling element is configured such that the input port receives a first signal at a first frequency within the first passband, and in response to the Josephson junction coupling element receiving a pump tone, the Josephson junction coupling element converts the first signal to a second signal at a second frequency within the second passband.SELECTED DRAWING: Figure 1

A system and method are disclosed for a superconducting traveling-wave parametric amplifier (TWPA) with improved control and performance. In a preferred embodiment, the amplifier comprises an integrated array of symmetric rf-SQUIDs in a transmission line structure. A device was fabricated using niobium superconducting integrated circuits, and confirmed predicted performance, with a maximum gain up to 17 dB and a bandwidth of 4 GHz. A similar device can be applied as a low-noise, low-dissipation microwave amplifier for output from a superconducting quantum computer, or as a preamplifier, switch, or frequency converter for a sensitive microwave receiver, or as an output amplifier for a frequency-multiplexed superconducting detector array.

One example includes an amplifier system. The system includes an input configured to receive an input pulse, a first input path coupled to the input and configured to provide the input pulse to a control node, and a second input path coupled to the input and comprising at least one delay element to provide a delayed version of the input pulse to the control node. The system also includes a first amplifier device comprising the control node and being configured to provide a control flux in response to the input pulse and in response to the delayed version of the input pulse. The system further includes a second amplifier device coupled to the first amplifier device, the second amplifier device being set to a flux state in response to the control flux to provide an output voltage.