Patent ID: 11941488
Assignee: GOOGLE LLC
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A method, performed by a quantum computing device, for duplicating a phased plus state, the method comprising:
performing a phase operation on a first qubit included in the quantum computing device and a second qubit included in the quantum computing device, wherein the first qubit is prepared in an arbitrary initial state and the second qubit is prepared in a plus state, comprising:
performing a first NOT operation on a third qubit included in the quantum computing device, wherein the third qubit is prepared in the phased plus state;
computing a controlled adder operation on the first, second and third qubits, comprising encoding a result of the controlled adder operation in a fourth qubit included in the quantum computing device;
performing a square of the phase operation on the fourth qubit;
uncomputing the controlled adder operation on the first, second and third qubits;
performing a CNOT operation between the first qubit and the third qubit, wherein the first qubit acts as the control;
performing a CNOT operation between the second qubit and the third qubit, wherein the second qubit acts as the control; and
performing a second NOT operation on the third qubit.