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US 2025/0053843 A1Published application
Fusion-based quantum repeater
AssigneePsiquantum, Corp.
InventorMihir Pant
Life of this patent
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Abstract
A quantum repeater circuit can include a resource state interconnect circuit that outputs one resource state per clock cycle, with each resource state having a number of entangled qubits. The circuit can also include circuits and delay lines to perform entangling measurement operations on qubits of resource states generated by the same resource state generator in different clock cycles. The circuit can be operated as a quantum repeater that receives an encoded logical qubit and produces a reduced-noise version of the encoded logical qubit.
Claims18
A quantum repeater circuit comprising:
- a plurality of resource state interconnect circuits, each resource state interconnect circuit having circuitry to output a resource state during each of a plurality of clock cycles, wherein each of the resource states comprises a system of entangled photonic qubits;
- a plurality of fusion circuits, each fusion circuit coupled between a pair of resource state interconnect circuits and configured to performing an entangling measurement operation between a first qubit produced by a first one of the pair of resource state interconnect circuits and a second qubit produced by a second one of the pair of resource state interconnect circuits;
- and
- a plurality of single-qubit measurement circuits coupled to selected ones of the resource state interconnect circuits to form a layer boundary,
- wherein each resource state interconnect circuit further includes:
- a delay circuit configured to delay one qubit of each resource state by a fixed time period;
- an internal fusion circuit;
- a first switch configured to select, as a first input to the internal fusion circuit, either a qubit output from the delay circuit or a qubit received from an external source;
- and
- a second switch configured to selectably direct one qubit of the resource state to either the delay circuit or to an output path.
7 more elements
A quantum repeater circuit comprising:
- a resource state interconnect having photonic circuitry to generate a resource state during each of a plurality of cycles, wherein each resource state comprises a system of at least six entangled photonic qubits;
- a plurality of fusion circuits including a first local fusion circuit, a second local fusion circuit, a third local fusion circuit, and a first 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 plurality of single-qubit measurement circuits including a first group, a second group, a third group, and a fourth group of single-qubit measurement circuits;
- a first routing switch configured to selectably direct a first qubit of each resource state to one of the first networked fusion circuit or the third local delay line;
- a second routing switch configured to selectably direct a second qubit of each resource state to one of the second delay line or one of the first group of single-qubit measurement circuits;
- a third routing switch configured to selectably direct a third qubit of each resource state to one of the first delay line or one of the second group of single qubit measurement circuits;
- a fourth routing switch configured to selectably direct a fourth qubit of each resource state to one of a second input of the third local fusion circuit or an output path;
- a fifth routing switch configured to selectably direct a fifth qubit of each resource state to one of the second input of the second local fusion circuit or one of the third group of single qubit measurement circuits;
- and
- a sixth routing switch configured to selectably direct a sixth qubit of the resource state to one of a second input of the first local fusion circuit or one of the fourth group of single qubit measurement circuits.
10 more elements
Dependencies are inferred from the claim text.