Quantum Bit Control Apparatus Using Optoelectronic Detectors
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Solution Overview
Problem
The existing refrigeration power in dilution refrigerators is insufficient to support the expansion of superconducting quantum bit systems, limiting the increase in controllable quantum bits and affecting system capacity expansion.
Innovation Solution
A quantum bit control apparatus that includes a control signal generator, N optoelectronic detectors, and a quantum chip, where optical control signals are generated in a first temperature area and converted into electronically controlled signals in a second temperature area within a vacuum shielding apparatus, reducing heat conduction and allowing for increased refrigeration power to support more control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the quantity of control signal lines is increased to support more quantum bits, then the system capacity is improved, but the heat conduction power increases and exceeds the refrigeration power
Solution Approach 1:
An optoelectronic converter is introduced as an intermediary device between the control signal lines and the quantum chip. This converter transforms electrical control signals into optical signals, which have significantly lower thermal conductivity. The optoelectronic converter is positioned at a temperature intermediate between room temperature and the quantum chip temperature, acting as a thermal buffer that blocks heat conduction while allowing signal transmission.
Solution Approach 2:
The patent replaces the direct electrical signal transmission system with an optical signal transmission system. By substituting electrical signals with optical signals for the final stage of control signal delivery to the quantum chip, the system eliminates the primary heat conduction pathway while maintaining control functionality.
2Productivity
If electrical control signals are transmitted directly to the quantum chip, then the control efficiency is improved, but the heat transfer to the quantum chip increases
Solution Approach 1:
The optoelectronic converter serves as a thermal intermediary that decouples the thermal and signal transmission functions. It receives electrical signals from the control lines, converts them to optical signals, and delivers them to the quantum chip. This intermediary approach maintains fast optical signal transmission while blocking thermal energy transfer from the warmer control lines to the colder quantum chip.
Solution Approach 2:
The patent changes the physical state and transmission medium of the control signals at the final stage. By converting signals from electrical form to optical form, the system exploits the fundamentally different thermal properties of optical fibers versus electrical conductors, achieving both efficient signal delivery and thermal isolation.
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
This solution reduces heat transfer and allows for more control signals to be supported with the same refrigeration power, enabling further system capacity expansion and increased controllable quantum bits.
Implementation Method 1
N optoelectronic detectors, and are configured to convert the received optical control signals into electronically controlled signals
Implementation Method 2
a quantum chip, and a shielding apparatus, where an inner part of the shielding apparatus is in a vacuum state
Data Source
AI summary
A quantum bit control apparatus, including a control signal generator, optoelectronic detectors, a quantum chip, and a shielding apparatus, the optoelectronic detectors are disposed in the shielding apparatus, and an inner part of the shielding apparatus is in a vacuum state. The control signal generator is disposed in a first temperature area, and is configured to generate optical control signals and send the N optical control signals to the optoelectronic detectors. The optoelectronic detectors are disposed in a second temperature area having a temperature lower than of the first temperature area. The N optoelectronic detectors are configured to convert the received optical control signals into electronically controlled signals and send the electronically controlled signals to the quantum chip. The quantum chip is disposed in the second temperature area, and controls a quantum bit in the quantum chip based on the electronically controlled signals.