Quantum Processor Lattice With Tunable Couplings for NP-Hard Solving
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Analog computing systems face limitations in precision and complexity due to their reliance on continuous physical quantities, while digital computers struggle with NP-hard problems, and quantum computing faces challenges with decoherence and noise in standard models.
Innovation Solution
A quantum processor comprising a lattice of quantum devices with Josephson junctions and coupling devices that evolve to a natural ground state to solve computational problems, allowing for efficient processing of NP-class problems by approximating the ground state of the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If analog systems use continuous physical quantities to represent variables, then operations are performed in parallel and faster than digital computers, but precision is limited by the precision to which the continuous variable can be quantified
Solution Approach 1:
The patent transitions from classical continuous physical parameters to quantum parameters (qubit states) to represent computational variables. This parameter change enables both high-speed parallel evolution of quantum states and precise measurement through quantum state discrimination, resolving the contradiction between speed and precision in analog computing
Solution Approach 2:
The patent replaces classical mechanical/electrical analog systems with a quantum mechanical system using qubits. The quantum system maintains the parallel evolution advantage of analog systems while adding precise state discrimination capability through quantum measurement, effectively substituting the physical basis to overcome the precision limitation
2Adaptability or versatility
If digital computers use finite state machine approach with clocks, then state discrimination is easy and they can solve broad computational problems, but they cannot efficiently solve NP-hard problems and are limited by maximum clock rate
Solution Approach 1:
The patent replaces the classical digital finite state machine approach with a quantum mechanical system. This substitution enables the system to exploit quantum parallelism and tunneling effects to efficiently explore the solution space of NP-hard problems, achieving exponential speedup for certain computational tasks while maintaining the ability to solve broad classes of problems
3Speed
If analog systems are designed to solve specific problems, then they can evolve states in real time without clocks, but they are limited in the types of problems they can solve and are often more complex than digital computers
Solution Approach 1:
The patent designs a universal quantum processor architecture where the same quantum circuit can be reconfigured to solve different computational problems. The quantum gates and qubit arrangements can be programmed to implement various algorithms, providing both real-time evolution capability and versatility across problem types, unlike specialized analog systems
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 analog processors to efficiently solve complex computational problems that are intractable for digital computers, such as NP-hard problems, by leveraging quantum properties to overcome precision and noise limitations.
Implementation Method 1
quantum devices having first and second basis states and comprising loops of superconducting material interrupted by Josephson junction(s)
Implementation Method 2
loops of superconducting material interrupted by Josephson junction(s)
Data Source
AI summary
Analog processors for solving various computational problems are provided. Such analog processors comprise a plurality of quantum devices, arranged in a lattice, together with a plurality of coupling devices. The analog processors further comprise bias control systems each configured to apply a local effective bias on a corresponding quantum device. A set of coupling devices in the plurality of coupling devices is configured to couple nearest-neighbor quantum devices in the lattice. Another set of coupling devices is configured to couple next-nearest neighbor quantum devices. The analog processors further comprise a plurality of coupling control systems each configured to tune the coupling value of a corresponding coupling device in the plurality of coupling devices to a coupling. Such quantum processors further comprise a set of readout devices each configured to measure the information from a corresponding quantum device in the plurality of quantum devices.