Quantum Wavelength Converter with Cryogenic Thermal-Noise Control
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Solution Overview
Problem
Existing microwave to optics converters operate at a classical level, introducing thermal noise that renders converted qubit states useless for further quantum processing.
Innovation Solution
A quantum wavelength converter using a nanoscale cavity optomechanical circuit with coherent coupling between phonon generators/detectors and optomechanical resonators, cooled to below 5K, and incorporating a light absorption inhibiting layer to operate below classical noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical system is used as a transducer for microwave to optics conversion, then conversion capability is achieved, but thermal noise from mechanical oscillators renders converted qubit states useless for quantum processing
Solution Approach 1:
The patent replaces the mechanical transducer system with a direct electromagnetic coupling system using a non-linear crystal. This substitution eliminates the mechanical oscillators that generate thermal noise, enabling quantum-limited conversion by removing the source of thermal contamination in the conversion process
Solution Approach 2:
The patent operates the non-linear crystal at specific temperatures and frequency conditions to achieve quantum-limited conversion. By controlling the operating parameters (temperature, frequency tuning) of the crystal, the system achieves efficient conversion while minimizing thermal noise, transforming the conversion process from classical to quantum regime
2Adaptability or versatility
If conversion is achieved at a classical level, then bi-directional operation and coherent coupling are realized, but the added thermal noise makes converted qubit states useless for further quantum processing
Solution Approach 1:
The patent achieves quantum-limited operation by changing the operating parameters of the non-linear crystal, specifically operating at temperatures where thermal noise is minimized and tuning frequencies to achieve quantum efficiency. This parameter optimization enables the system to maintain coherence and reduce thermal noise while preserving bi-directional conversion capability
Solution Approach 2:
The non-linear crystal acts as an intermediary medium that enables direct electromagnetic coupling between microwave and optical fields. This intermediary approach allows coherent, bi-directional conversion without the thermal noise contamination introduced by mechanical transducers, thereby maintaining quantum processing capability
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
Enables reliable conversion of microwave quantum signals to optical quantum signals and vice versa at a quantum level, minimizing thermal noise and allowing for quantum information processing.
Implementation Method 1
the present converter is provided with a cooler for cooling the microwave-to-optical coupler to a temperature below 5K
Implementation Method 2
Piezo-electricity relates to an electric charge that results in a solid material, typically a crystal, in response to applied mechanical stress or force
Implementation Method 3
optomechanical cavities supporting colocalized infrared photons and microwave phonons are combined with a photonic and a phononic waveguide
Data Source
AI summary
The present invention is in the field of a quantum wavelength converter between a microwave signal and an optical signal and vice versa. In the converter a nanoscale cavity optomechanical circuit is used in which optomechanical cavities supporting colocalized infrared photons and microwave phonons are combined with a photonic and a phononic waveguide.