Superconducting Photon Detector Array Circuit Scale Reduction
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Solution Overview
Problem
Photon detection devices with superconducting photon detectors face challenges due to high circuit scale and power consumption, particularly when transmission lines are branched for time and address information generation, leading to increased heat and reduced efficiency.
Innovation Solution
A photon detection device design that includes a superconducting photon detector array with a single second transmission line magnetically coupled to all first transmission lines, using direct-current SQUID elements for time information generation and AC-driven or DC-driven superconducting logic circuits for signal processing, reducing the number of transmission lines and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If transmission lines are branched into two parts for time information and address information generation, then both time and address information can be generated, but the circuit scale becomes large and power consumption increases
Solution Approach 1:
The patent combines both time information generation and address information generation into a single circuit by using one set of transmission lines for both functions. The time information is extracted from the timing of signals while the address information is obtained from the pattern of signal activation, eliminating the need for separate transmission line branches and reducing overall circuit complexity.
Solution Approach 2:
The single transmission line system serves multiple functions simultaneously - it carries both time information through temporal characteristics and address information through spatial activation patterns. This multi-functional approach allows one circuit to perform what previously required two separate circuits.
2Loss of information
If transmission lines are branched into two parts for time information and address information generation, then both time and address information can be generated, but power consumption becomes high
Solution Approach 1:
By merging the transmission lines into a single system that handles both time and address information, the patent reduces the total number of active transmission lines and circuit components, thereby lowering overall power consumption while maintaining complete information generation capability.
Solution Approach 2:
The universal transmission line system performs dual functions (time and address information extraction) without requiring separate dedicated lines, reducing the total energy consumption of the system while preserving both information types.
3Length of moving object
If a signal processing circuit configured by superconducting logic circuit is provided inside cryocooler, then the number of transmission lines taken out of cryocooler is reduced, but the circuit scale becomes large and power consumption increases
Solution Approach 1:
The patent extracts only the essential timing information from the detection signals and processes it outside the cryocooler using minimal circuitry. By taking out only the time information extraction function rather than implementing a complete signal processing system inside the cryocooler, the design reduces both the number of transmission lines and the circuit scale simultaneously.
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 design results in a smaller circuit scale and lower power consumption, effectively addressing the issues of heat management and efficiency while maintaining accurate time and address information generation.
Implementation Method 1
a second transmission line magnetically coupled to all of the plurality of first transmission lines
Implementation Method 2
The second transmission line may include a plurality of direct-current SQUID elements
Data Source
AI summary
A photon detection device according to an aspect of the present invention includes: a superconducting photon detector array in which a plurality of superconducting photon detectors (SPDs) are arranged; a plurality of first transmission lines connected to the plurality of SPDs and configured to transmit a detection current output from each of the plurality of SPDs; an address information generation circuit connected to the plurality of first transmission lines and configured to generate, based on the detection current, an address information signal that specifies a superconducting photon detector from which the detection current is output; a second transmission line magnetically coupled to all of the plurality of first transmission lines; and a time information generation circuit connected to the second transmission line and configured to generate, based on the detection current, a time information signal indicating a time at which a photon is incident on the plurality of superconductive photon detection SPDs.