Superconducting Resonator Addressing With Frequency-Multiplexed XY Bias
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Solution Overview
Problem
Existing systems for addressing devices in superconducting circuits, particularly for resonator-addressing of superconducting flux storage devices and digital-to-analog converters (DAC) in superconducting integrated circuits, face challenges such as high complexity, cost, and vulnerability due to the large number of wires and superconducting low-pass filters required.
Innovation Solution
The proposed solution involves using a superconducting integrated circuit design that includes a microwave transmission line, superconducting flux storage devices with compound Josephson junctions, and resonators communicatively coupled to the transmission line. This design employs frequency-domain multiplexing and XY-addressing schemes to reduce the number of wires and filters, improving complexity and cost efficiency while enhancing bandwidth and processing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional wiring methods are used to address superconducting devices, then each device can be individually controlled, but the number of wires and filters increases significantly, leading to high complexity and cost
Solution Approach 1:
Multiple address lines are merged into a single shared transmission line. The patent combines X-address and Y-address lines into one common line, reducing the total number of wires needed to address two-dimensional arrays of superconducting devices.
Solution Approach 2:
The patent transitions from spatial separation of address lines to frequency separation. By assigning different frequency ranges to different address dimensions (X-address vs Y-address), multiple address signals share the same physical transmission line without interference.
2Measurement precision
If more wires and superconducting low-pass filters are used to address devices, then addressing precision can be maintained, but cost and vulnerability increase
Solution Approach 1:
The patent uses frequency-domain copies of address signals instead of physical wire copies. Different frequency components carry different address information along the same physical line, eliminating the need for multiple physical connections while preserving addressing precision.
Solution Approach 2:
The patent replaces the mechanical/physical separation of address lines with an electromagnetic field-based frequency multiplexing system. Instead of using separate physical wires for each address line, the system uses frequency-modulated electromagnetic signals on a shared transmission line.
3Productivity
If frequency-domain multiplexing is implemented, then bandwidth and processing speed improve, but signal interference and cross-talk may increase
Solution Approach 1:
The frequency spectrum is segmented into distinct bands for different address dimensions. X-address signals occupy one frequency range while Y-address signals occupy another, allowing simultaneous transmission without interference and enabling high-speed parallel addressing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively addresses the complexity and cost issues of existing systems by reducing the number of wires and filters, while improving bandwidth and processing speed through frequency-domain multiplexing and XY-addressing. This results in a more efficient and reliable method for resonator-addressing in superconducting integrated circuits.
Implementation Method 1
the CJJ comprising two parallel current paths each interrupted by a respective Josephson junction
Implementation Method 2
a first signal interface that inductively communicatively couples the first superconducting resonator to the first superconducting flux storage device
Implementation Method 3
a first superconducting flux storage device comprising a loop of material that is superconductive in a range of temperatures
Data Source
AI summary
Superconducting integrated circuits may advantageously employ superconducting resonators coupled to a microwave transmission line to efficiently address superconducting flux storage devices. In an XY-addressing scheme, a global flux bias may be applied to a number of superconducting flux storage devices via a low-frequency address line, and individual superconducting flux storage devices addressed via application of high-frequency pulses via resonators driven by the microwave transmission line. Frequency multiplexing can be employed to provide signals to two or more resonators. A low-frequency current bias may be combined with a high-frequency current in one or more superconducting resonators to provide Z-addressing. A low-frequency current bias may be combined with a high-frequency current in one or more superconducting resonators to eliminate a flux bias line. A low-frequency current bias may be used at room temperature to identify the presence of a DC short, an open, and/or an unexpected resistance in a superconducting resonator.