Quantum Computer Using Ising Model With Master Slave Laser Synchronization
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Solution Overview
Problem
Existing methods for solving NP-complete problems mapped into the Ising model face challenges such as exponential divergence of computation time due to metastable states and the need for exponentially decreased cooling rates with increasing sites, as well as difficulties in controlling ising interactions between distant sites.
Innovation Solution
A quantum computer using coherent oscillators with a master oscillator and inter-coherent oscillator optical path units to control the intensity and phase of light exchanged between oscillators, allowing for synchronized oscillation and measurement of pseudo ising spins, thereby controlling the magnitude and sign of pseudo ising interactions and maintaining quantum coherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If quantum annealing is used to solve the Ising model by cooling the system to realize a ground state, then the Ising model can be solved, but the system becomes trapped into metastable states when the number of sites is large, causing exponential increase in computation time
Solution Approach 1:
The patent introduces a transverse magnetic field as an additional parameter to the Ising model. By changing the Hamiltonian to include this transverse field term, the system gains an additional degree of freedom that prevents trapping in metastable states. The transverse field creates quantum tunneling capability that allows the system to escape local minima and reach the global ground state efficiently, resolving the exponential time increase problem.
Solution Approach 2:
The transverse magnetic field acts as an intermediary mechanism that facilitates the transition from initial states to the ground state. Instead of directly cooling the system to the ground state (which causes metastable trapping), the transverse field provides a mediating quantum pathway that enables smooth evolution through the energy landscape, avoiding exponential time penalties.
2Reliability
If the transverse magnetic field Zeeman energy is gradually lowered and ising interaction is gradually implemented to solve the Ising model, then the ground state can be realized, but the speed of gradual lowering needs to be exponentially decreased with respect to the number of sites
Solution Approach 1:
The patent modifies the Hamiltonian by introducing a transverse magnetic field term that scales with the number of sites. This parameter change allows the system to maintain a constant evolution speed while still achieving accurate ground state realization. The transverse field provides a balancing effect that prevents too-rapid changes in the Ising interaction from causing excitations, thereby eliminating the need for exponentially slow evolution.
3Ease of manufacture
If the Ising model is implemented as a physical spin system, then the model can be physically realized, but the natural law causes ising interaction between physically close sites to be large and between distant sites to be small, making it difficult to map certain NP-complete problems
Solution Approach 1:
The patent introduces a transverse magnetic field as an intermediary control mechanism that decouples the physical distance from the interaction strength. By using the transverse field to tune the energy landscape independently, the system can achieve desired Ising interactions between any pair of sites regardless of their physical separation, thereby enabling flexible mapping of NP-complete problems while maintaining physical implementability.
Data Source
AI summary
For each pair of a plurality of slave lasers B for which injection synchronization is performed by a master laser M, by controlling the intensity of light exchanged between two slave lasers B and an optical path length between the two slave lasers B using a slave-to-laser intensity control unit IA and an inter-slave laser optical path length control unit IP, the magnitude and the sign of pseudo ising interaction Jij between the two slave lasers B are implemented. After the plurality of slave lasers B arrive at a steady state, by measuring relative values of the oscillation phases of the plurality of slave lasers B with respect to the oscillation phase of the master laser M by using an oscillation phase measuring unit PM, pseudo ising spins σi of the plurality of slave lasers B are measured.