3 results about "Quantum phase transition" patented technology

The invention relates to a quantum phase change critical index measuring method and system, a medium and a program product, and relates to the field of quantum calculation and quantum simulation. The method comprises the following steps: for each candidate value of a critical index, determining a plurality of value combinations of a change speed and a system size of a system parameter of a quantum system, so that the candidate value, the change speed and the system size meet a first condition; for each value combination of the change speed and the system size, linearly changing system parameters by the change speed to enable the quantum system to generate quantum phase change; measuring a first correlation function of the quantum system; performing scale transformation meeting a second condition on the first correlation function to obtain a second correlation function; for each candidate value, comparing differences between the second correlation functions; and selecting a candidate value that minimizes the difference as a measurement of the critical index. The method can overcome the problems of short coherence time and limited system size of a quantum system, and improves the measurement accuracy.

A non-transitory computer-readable storage medium storing a solution search program that causes at least one computer to execute a process, the process includes reducing, when searching for a ground state of the Ising model that represents a problem by obtaining a state change of the Ising model, a strength of a magnetic field applied to the Ising model according to a first annealing schedule from an initial state of the Ising model; and reducing, after a quantum phase transition occurs in the Ising model, the strength of the magnetic field according to a second annealing schedule.

The invention discloses a method for inducing dynamic quantum phase change by adopting a chiral phase, and belongs to the technical field of dynamic quantum phase change methods, the chiral phase is introduced under the condition of reverse quenching in quantum superconducting bits, and the dynamic quantum phase change can be successfully observed from the chiral phase, which is not proposed by people at present. In the prior art, when quenching kinetics is constructed, the kinetics quantum phase change can be observed only by considering forward quenching, or the kinetics quantum phase change phenomenon cannot be observed by reverse quenching, and in the method, the kinetics quantum phase change is induced during reverse quenching in a phase introduction mode.