US 11,989,623 B2
Quantum computer and quantum state controlling method in quantum computer
Tatsuya Tomaru, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Filed by Hitachi, Ltd., Tokyo (JP)
Filed on Mar. 7, 2022, as Appl. No. 17/687,751.
Claims priority of application No. 2021-097298 (JP), filed on Jun. 10, 2021.
Prior Publication US 2022/0398481 A1, Dec. 15, 2022
Int. Cl. G06N 10/20 (2022.01); G01R 33/44 (2006.01)
CPC G06N 10/20 (2022.01) [G01R 33/44 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A quantum computer comprising:
a quantum register holding qubits,
a control gate performing an operation on the quantum register, and
a readout unit observing a state of the quantum register;
wherein the quantum computer repeats a longitudinal relaxation to a ground state by gradually changing a Hamiltonian H(t) for a predetermined time,
wherein the Hamiltonian H(t) is a problem to be solved, and
wherein a unitary operation determined by the Hamiltonian H(t) at each time is performed by the control gate over a time of a longitudinal relaxation time, the quantum state is relaxed every time of the longitudinal relaxation time, and the ground state prepared for an initial state is time-evolved to the ground state of the Hamiltonian.