US 11,777,505 B2
Controllable quantum logic gates and methods for use therewith
Adam Szady, Cracow (PL)
Assigned to BEIT Inc., Millbrae, CA (US)
Filed by BEIT Inc., Millbrae, CA (US)
Filed on Sep. 16, 2021, as Appl. No. 17/447,842.
Claims priority of provisional application 63/084,187, filed on Sep. 28, 2020.
Prior Publication US 2022/0103178 A1, Mar. 31, 2022
Int. Cl. H03K 19/195 (2006.01); B82Y 10/00 (2011.01); G06N 10/00 (2022.01)
CPC H03K 19/195 (2013.01) [B82Y 10/00 (2013.01); G06N 10/00 (2019.01)] 17 Claims
OG exemplary drawing
 
1. A controlled quantum logic gate that implements a replacement for an n−1 qubit controlled X gate function to n qubits, wherein n is greater than 4, the controlled quantum logic gate comprising:
a controlled gate that selectively applies, under control of a first subset of then qubits, a pi radian Z-axis Bloch sphere rotation to a target qubit of the n qubits; and
a pair of controlled Hadamard gates that selectively conjugate the target qubit under control of a second subset of the n qubits;
wherein elements of the first subset of the n qubits are mutually exclusive of elements of the second subset of the n qubits.