US 12,468,970 B2
Photonic quantum computer architecture
Naomi Nickerson, San Francisco, CA (US); and Hector Bombin Palomo, Kyoto (JP)
Assigned to Psiquantum, Corp., Palo Alto, CA (US)
Filed by Psiquantum, Corp., Palo Alto, CA (US)
Filed on Dec. 17, 2021, as Appl. No. 17/555,238.
Application 17/555,238 is a continuation of application No. PCT/US2020/038962, filed on Jun. 22, 2020.
Claims priority of provisional application 63/006,590, filed on Apr. 7, 2020.
Claims priority of provisional application 62/926,383, filed on Oct. 25, 2019.
Claims priority of provisional application 62/865,058, filed on Jun. 21, 2019.
Prior Publication US 2022/0224996 A1, Jul. 14, 2022
Int. Cl. G06N 10/20 (2022.01); G06N 10/40 (2022.01); H03K 17/92 (2006.01); H04B 10/70 (2013.01); H04Q 11/00 (2006.01)
CPC G06N 10/20 (2022.01) [G06N 10/40 (2022.01); H03K 17/92 (2013.01); H04B 10/70 (2013.01); H04Q 11/0005 (2013.01); H04Q 2011/002 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A circuit for generating entanglement among qubits, the circuit comprising a number (N) of unit cells forming a network such that each unit cell is coupled to at least two neighboring unit cells, each unit cell comprising:
a routing circuit having a plurality of optical paths to provide a first local resource state during a first clock cycle, a second local resource state during a second clock cycle, a third local resource state during a third clock cycle, and a fourth local resource state during a fourth clock cycle, wherein each of the first, second, third, and fourth local resource states comprises a system of entangled photonic qubits and wherein the first, second, third, and fourth clock cycles are different clock cycles;
a plurality of fusion circuits including a first local fusion circuit, a second local fusion circuit, a third local fusion circuit, a first networked fusion circuit, and a second networked fusion circuit, each of the plurality of fusion circuits being configured to perform an entangling measurement operation between two input qubits;
a first local delay line coupled to a first input of the first local fusion circuit and having a delay of a first number of clock cycles;
a second local delay line coupled to a first input of the second local fusion circuit and having a delay of a second number of clock cycles, the second number being greater than the first number;
a third local delay line coupled to a first input of the third local fusion circuit and having a delay of a third number of clock cycles, the third number being greater than the second number;
a first routing switch configured to selectably direct a first qubit of each resource state to one of the first local delay line of the unit cell or a first input of the first networked fusion circuit of a first neighboring unit cell;
a second routing switch configured to selectably direct a second qubit of each resource state to one of a second input of the first local fusion circuit or a second input of the first networked fusion circuit of the unit cell;
a third routing switch configured to selectably direct a third qubit of each resource state to one of the second local delay line of the unit cell or a first input of the second networked fusion circuit of a second neighboring unit cell;
a fourth routing switch configured to selectably direct a fourth qubit of each resource state to one of a second input of the second local fusion circuit or a second input of the second networked fusion circuit of the unit cell;
a first routing path to direct a fifth qubit of each resource state to the third local delay line; and
a second routing path to direct a sixth qubit of each resource state to the third local fusion circuit.