Simulation method of quantum system, computing device and storage medium

A simulation method of a quantum system, applied to a classical computing device, comprising:

• acquiring at least two measurement results, wherein a first measurement result of the at least two measurement results represents a trace distance between a first output state and a first target output state;
• a second measurement result of the at least two measurement results represents a trace distance between a second output state and a second target output state;
• the first output state is an output state after a preset parameterized quantum circuit acts on a first quantum state in a case of an adjustable parameter of the preset parameterized quantum circuit is at a first parameter value;
• the second output state is an output state after the preset parameterized quantum circuit acts on a second quantum state in a case of the adjustable parameter of the preset parameterized quantum circuit is at the first parameter value;
• the first target output state represents an output state after an initial time evolution circuit acts on the first quantum state;
• the second target output state represents an output state after the initial time evolution circuit acts on the second quantum state;
• the initial time evolution circuit is an approximate quantum circuit of a unitary matrix of a target quantum system containing n quantum bits;
• the preset parameterized quantum circuit is a quantum circuit containing n quantum bits and having the adjustable parameter;
• and n is a natural number greater than or equal to 1;
• calculating a loss value of a loss function representing an average trace distance, based on trace distances represented by the at least two measurement results;
• and
• taking the preset parameterized quantum circuit with the adjustable parameter at the first parameter value as a target parameterized quantum circuit, in a case of the loss value of the loss function satisfies an iteration requirement, wherein the target parameterized quantum circuit is the approximate quantum circuit of the initial time evolution circuit.