US 2020/0348579 A1 · Efficient, High-Speed Two-Photon Logic Gates at Room Temperature for General-Purpose Quantum Information Processing

Abstract

A two-photon logic gate introduces a phase shift between two photons using a Q-switched cavity with some nonlinearity. The two-photon logic gate catches photons in and releases photons from de-coupled cavity modes in response to electronic or photonic control signals. This “catch-and-release” two-photon gate can be formed in semiconductor photonic integrated circuit (PIC) that operates at room temperature. When combined with sources, linear circuits, other logic gates, and detectors, it can be used to make a quantum computer with up to 1000 error-corrected logical qubits on a cm2 PIC, with full qubit connectivity to avoid overhead. Two-qubit gate fidelity exceeding 99% is possible with near-term technology, and scaling beyond 99.9% is possible. Two-photon logic gates are also suitable for gate-based quantum digital computing and for analog quantum computing schemes, such as adiabatic quantum computing or quantum annealing.

Claims22

Dependent claims

A method of processing a photon wave packet including either one photon or two photons, the method comprising:

coupling the photon wave packet from an optical waveguide into a first resonant mode of an optical resonator comprising a nonlinear optical material, the first resonant mode being at a first resonance frequency;
nonlinearly coupling the photon wave packet, via at least one classical control field, from the first resonant mode of the optical cavity to a second resonant mode of the optical resonator that is de-coupled from the optical waveguide, the second resonant mode being at a second resonance frequency different than the first resonance frequency;
applying a 0 phase shift to the photon wave packet if the photon wave packet includes one photon or a 7 phase shift to the photon wave packet if the photon wave packet includes two photons;
nonlinearly coupling the photon wave packet, via the at least one classical control field, from the second resonant mode to the first resonant mode;
and
coupling the photon wave packet from the optical resonator to the optical waveguide.

3 more elements

Dependencies are inferred from the claim text.

Efficient, High-Speed Two-Photon Logic Gates at Room Temperature for General-Purpose Quantum Information Processing

Life of this patent

Efficient, High-Speed Two-Photon Logic Gates at Room Temperature for General-Purpose Quantum Information Processing

Life of this patent

Abstract

Claims22