Quantum Transducer Drive Optimization for Inhomogeneous Broadening

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Superconducting quantum circuits face challenges in direct quantum communication due to high propagation loss of microwave photons, and ensembles of quantum emitters suffer from inhomogeneous broadening, which reduces transduction efficiency between microwave and optical frequencies.

Innovation Solution

The design of a time-dependent drive for quantum transducers is optimized using numerical techniques to compensate for inhomogeneous broadening, enhancing transduction efficiency by coherently coupling electromagnetic modes and forming a collective superradiant state.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a single quantum emitter is used for transduction, then the system is simple, but the transduction efficiency is insufficient

Engineering Contradiction:

Improvetransduction efficiencyVSAvoidnumber of quantum emitters

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent combines multiple quantum emitters into a single transduction system to achieve higher efficiency. By merging the capabilities of multiple emitters, the system overcomes the insufficiency of single-emitter transduction while managing the complexity through collective coupling mechanisms.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a universal transduction interface that can couple multiple quantum emitters to both microwave and optical fields simultaneously. This multi-functional approach allows the system to handle multiple emitters through a unified coupling mechanism, improving efficiency without proportionally increasing system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If an ensemble of quantum emitters is used to improve efficiency, then transduction efficiency increases, but inhomogeneous broadening reduces performance

Engineering Contradiction:

Improvetransduction efficiencyVSAvoidtransduction performance stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the temporal parameters of the driving field to match the inhomogeneous frequency distribution of the emitter ensemble. By adjusting the time-dependent characteristics of the drive, the system compensates for frequency variations across emitters, maintaining high transduction efficiency despite inhomogeneous broadening.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs dynamic, time-dependent driving fields instead of static drives. The temporal shape of the drive is optimized to adapt to the ensemble's frequency distribution, allowing the system to dynamically compensate for inhomogeneous broadening and maintain reliable performance.

Inventive Principle:

Principle #15Dynamics

3Productivity

If constant drives are used for transduction, then the system is simple to operate, but transduction efficiency is limited

Engineering Contradiction:

Improvetransduction efficiencyVSAvoiddrive temporal control

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent employs periodic or time-varying drive patterns instead of constant drives. By using temporally structured driving fields, the system achieves enhanced transduction efficiency while the periodic nature provides a systematic approach to managing the added temporal control complexity.

Inventive Principle:

Principle #19Periodic action

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

This approach leads to an order of magnitude improvement in transduction efficiency, enabling more effective quantum communication between distant superconducting quantum systems by mitigating the effects of inhomogeneous broadening.

Implementation Method 1

coherently coupling electromagnetic modes

Methodology Applied

Scientific EffectCoherent coupling:

Implementation Method 2

forming a collective superradiant state

Methodology Applied

Scientific EffectSuperradiance:

Implementation Method 3

The Rabi frequencies of the microwave and optical transitions are modulated by a time-dependent pump that drives Rabi oscillations

Methodology Applied

Scientific EffectRabi oscillations:

Data Source

PatentUS20220327415A1Optimized quantum transduction

Publication Date: 2022.10.13 THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIV

AI summary

Improved quantum transducers based on ensembles of quantum emitters are provided. This work improves the efficiencies of such transducers by compensating for the detrimental effects of inhomogeneous broadening of transition frequencies in such systems. This approach is built upon the insight that the temporal shape of the drive supplying the energy required for transduction can be experimentally tuned. Hence, it is an additional degree of freedom for designing efficient transducers. We pose the design of the drive as a scattering theory optimization problem, where the transduction efficiency is the quantity being maximized, and employ numerical optimization techniques to solve it.