Qubit Frequency Annealing via Laser Discharge Structures
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Solution Overview
Problem
In quantum computing, the addition of each qubit to a chip increases design complexity due to quantum interactions, particularly frequency collisions caused by similar resonance frequencies, which existing methods like adjustable magnetic fields fail to address effectively without introducing noise and complexity.
Innovation Solution
The method involves forming qubits with Josephson junctions on a chip and using laser discharge structures on a planar lightwave circuit to anneal the qubits, allowing for precise adjustment of their resonance frequencies by changing the resistance of the Josephson junctions, thereby avoiding frequency collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adjustable magnetic fields are used to tune qubit frequencies, then frequency collisions can be avoided, but noise and system complexity increase
Solution Approach 1:
The patent extracts the magnetic field tuning mechanism and replaces it with an electrical resistance tuning mechanism applied directly to the Josephson junction. By removing the external magnetic field requirement and using only electrical signals applied to the junction, the system eliminates the noise and complexity associated with magnetic field generation and control while maintaining the ability to tune qubit frequencies and avoid collisions
Solution Approach 2:
The patent substitutes the mechanical/electromagnetic system (adjustable magnetic fields) with an electrical system (resistance tuning via applied voltage). Instead of using magnetic fields to adjust qubit frequencies, the invention uses electrical signals to change the resistance of the Josephson junction, which in turn adjusts the frequency. This substitution reduces system complexity and noise while achieving the same frequency tuning objective
2Productivity
If more qubits are added to increase computing power, then quantum computing performance improves, but frequency collisions and design complexity increase
Solution Approach 1:
The patent implements a self-service tuning mechanism where each Josephson junction has its own control electrode that can independently adjust its resistance and frequency. This allows each qubit to self-tune without requiring external magnetic field control, enabling scalable multi-qubit systems where frequency collisions can be avoided through simple electrical control of individual junctions rather than complex global magnetic field management
Solution Approach 2:
The patent changes the tuning parameter from magnetic field strength to electrical resistance. By controlling the resistance of each Josephson junction through applied voltage, the system can independently adjust the frequency of each qubit. This parameter change simplifies the control mechanism and enables scalable multi-qubit systems, as electrical resistance control is more straightforward and less noisy than magnetic field control
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 approach enables precise tuning of qubit frequencies, reducing noise and complexity in multi-qubit systems, allowing for high-performance quantum computing by stabilizing qubit states and accurately determining their resonance frequencies through microwave signal interactions.
Implementation Method 1
annealing one or more Josephson junctions. Annealing is performed by one or more of a plurality of laser discharge structures on a planar lightwave circuit
Implementation Method 2
Annealing is performed by one or more of a plurality of laser discharge structures on a planar lightwave circuit
Implementation Method 3
The switching between the ports is achieved by an electro-optic effect within such structure. Voltage, applied to the electrodes deposited on the integrated Mach-Zehnder interferometer, creates an electric field distribution within the substrate, which consequently changes its refractive index
Implementation Method 4
each qubit comprises a Josephson junction
Data Source
AI summary
A structure including a plurality of laser discharge structures located on a planar lightwave circuit, and a single laser source connected to each of the plurality of laser discharge structures by one or more Mach Zehnder switches and a plurality of optical connections.