Ising Model Quantum Computation Device Using Coherent Oscillators
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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 slow implementation of Ising interactions as the number of sites increases, as well as difficulties in controlling interactions between distant sites.
Innovation Solution
The implementation of a quantum computation device using coherent oscillators with controlled light intensity, polarization, and phase to establish pseudo Ising interactions, allowing for the measurement of pseudo spins without breaking quantum coherence, thereby reducing computation time and enabling efficient solution of NP-complete problems regardless of site distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum annealing is used to solve the Ising model, then the ground state can be realized by cooling the system, but when the number of sites is large, the system gets trapped in metastable states and the computation time exponentially increases
Solution Approach 1:
The patent replaces the thermal cooling mechanism with an optical field-based evolution mechanism. Instead of relying on thermal annealing that causes metastable state trapping, the system uses controlled optical fields to guide the quantum state evolution, substituting thermal mechanics with optical control to achieve faster convergence to the ground state
Solution Approach 2:
The patent dynamically changes the parameters of optical fields (intensity, phase, polarization) during the computation process. By adjusting these optical parameters, the system can control the evolution speed and avoid metastable state trapping, thereby reducing computation time while maintaining accuracy
2Reliability
If quantum adiabatic evolution is used to solve the Ising model, then the ground state can be realized by slowly implementing Ising interaction, but when the number of sites is large, the implementation speed must be exponentially decreased
Solution Approach 1:
The patent replaces the slow adiabatic evolution mechanism with an optical field-controlled evolution mechanism. Instead of relying on gradual physical implementation of Ising interactions, the system uses optical fields to directly control the quantum state transitions, substituting slow mechanical evolution with fast optical control
Solution Approach 2:
The patent employs periodic modulation of optical field parameters to drive the quantum evolution. By using periodic optical actions, the system can achieve controlled evolution without requiring exponentially slow implementation, thereby increasing the implementation speed while maintaining ground state accuracy
3Ease of manufacture
If a natural spin system is used to implement the Ising model, then physical implementation is straightforward, but Ising interaction between distant sites cannot be effectively controlled due to natural law limitations
Solution Approach 1:
The patent introduces optical fields as intermediaries to mediate interactions between quantum oscillators. The optical fields act as carriers that can transmit interaction effects between distant sites without being constrained by natural decay laws, enabling effective control of long-range interactions while maintaining ease of implementation
Solution Approach 2:
The patent creates a universal interaction mechanism using optical fields that can simultaneously control interactions between both close and distant sites. The optical field system provides multi-functional control capability, allowing the same mechanism to handle various interaction ranges and strengths, thereby increasing adaptability
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 significantly shortens computation time by maintaining quantum coherence and allowing for efficient implementation of Ising interactions between both close and distant sites, effectively addressing the challenges of exponential divergence and site number scaling.
Implementation Method 1
coherent oscillators with controlled light intensity, polarization, and phase
Implementation Method 2
controlled light intensity, polarization, and phase to establish pseudo Ising interactions
Implementation Method 3
maintaining quantum coherence and allowing for efficient implementation of Ising interactions
Implementation Method 4
measurement of pseudo spins without breaking quantum coherence
Data Source
AI summary
This computation device and method exponentially shortens a computation time of an NP-complete problem or the like mapped into an Ising model by exponentially shortening a computation time of the Ising mode. For each pair of a plurality of slave lasers, by controlling the intensity, the polarization, and the phase of light exchanged between two slave lasers using an attenuator and a wave plate, the magnitude and the sign of pseudo Ising interaction between two slave lasers are implemented. Then, after the plurality of slave lasers arrive at a steady state, by measuring the polarization of light generated by each slave laser with left-handed circular polarization and right-handed circular polarization used as bases, a pseudo spin of each slave laser is measured.