Photonic Quantum Clock Generation Using Local Pump Pulse Detection
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Solution Overview
Problem
Photonic quantum computers require accurate clock signals for precise timing control of optical elements, but existing methods face challenges such as random phase errors and non-deterministic heralding signals.
Innovation Solution
A system for generating clock signals for a photonic quantum computing system, which includes a pump photon source outside a cryostat, a waveguide, a photon-pair source inside the cryostat, a photodetector, and a clock generator. The system converts excess pump photons into electrical pulses, which are then used to generate clock signals at a specific repetition rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If clock signals are generated outside the cryostat, then device complexity is reduced, but random phase errors increase and measurement precision deteriorates
Solution Approach 1:
A photodetector is introduced as an intermediary component inside the cryostat to detect pump photon pulses and generate electrical pulses. These electrical pulses serve as the basis for generating clock signals, acting as a mediator between the optical domain (pump photons) and the electrical domain (clock signals), thereby enabling precise timing control while maintaining system integration within the cryogenic environment.
Solution Approach 2:
The patent replaces traditional mechanical or external electronic clock generation systems with an optically-based clock generation mechanism. Instead of using external oscillators or mechanical timing devices, the system uses the detection of optical pump photons to generate electrical clock signals, substituting a mechanical/electronic timing system with an optical-to-electrical conversion system that is inherently synchronized with the quantum optical processes.
2Device complexity
If non-deterministic heralding signals are used, then device complexity is reduced, but reliability of timing control deteriorates
Solution Approach 1:
The system implements a feedback mechanism where the detection of pump photon pulses by the photodetector provides real-time information about the timing of photon generation. This feedback loop allows the clock generator to synchronize clock signals with the actual arrival times of pump photons, ensuring deterministic timing control while maintaining relatively simple device architecture. The feedback from photon detection to clock generation creates a closed-loop timing control system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides accurate and synchronized clock signals, reducing random phase errors and ensuring high performance of the photonic quantum computer by generating clock signals locally within the cryostat.
Implementation Method 1
a photodetector disposed inside the cryostat and configured to receive the second portion of each pump photon pulse of the plurality of pump photon pulses generate a plurality of electrical pulses by converting the second portion of each pump photon pulse of the plurality of pump photon pulses into a respective electrical pulse of the plurality of electrical pulses
Implementation Method 2
The photon-pair source is configured to receive the plurality of pump photon pulses via the waveguide, convert a first portion of each of a subset of the plurality of pump photon pulses into a photon pair
Data Source
AI summary
A system for generating clock signals for a photonic quantum computing system includes a first pump photon source, a first photon-pair source optically coupled to the first pump photon source, and a first photodetector optically coupled to the first photon-pair source. The system also includes a first clock generator electrically coupled to the first photodetector, a second pump photon source, a second photon-pair source optically coupled to the second pump photon source, and a second photodetector optically coupled to the second photon-pair source. The system further includes a second clock generator electrically coupled to the second photodetector and a clock mediator coupled to the first clock generator and the second clock generator.