Quantum processor on a chip

A quantum computing device, comprising:

• an electronic integrated circuit (IC) chip comprising a first array of avalanche detectors;
• a second array of qubits configured to perform quantum operations and to output optical radiation responsively to results of the quantum operations;
• and
• a network of optical waveguides coupled to convey the radiation output by the qubits in the second array to the avalanche detectors in the first array.

A method for quantum computing, comprising:

• providing an electronic integrated circuit (IC) chip comprising a first array of optical sensors;
• overlaying on the electronic IC chip a photonic integrated circuit (PIC) comprising a network of optical waveguides, which have respective inputs coupled to receive optical radiation and outputs coupled to deliver the optical radiation to the optical sensors;
• and
• placing on the PIC a second array of qubits configured to perform quantum operations so that responsively to results of the quantum operations, the qubits output the optical radiation into the inputs of the optical waveguides.

A method for quantum computing, comprising:

• providing an electronic integrated circuit (IC) chip comprising a first array of avalanche detectors;
• providing a second array of qubits configured to perform quantum operations and to output optical radiation responsively to results of the quantum operations;
• and
• coupling a network of optical waveguides to convey the radiation output by the qubits in the second array to the avalanche detectors in the first array.