Quantum Memory Using Multiple Dot Heterostructure Tunneling

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Solution Overview

Problem

Conventional quantum data storage techniques using electromagnetically induced transparency (EIT) face limitations in storage time due to spin decoherence, leading to degradation in data fidelity and quality, which restricts the distance and duration of quantum communication.

Innovation Solution

The method involves multiplexing and storing quantum data in a multiple dot heterostructure using electromagnetically induced transparency, followed by controlled tunneling between quantum dots to maintain coherence, combined with localized error correction techniques to enhance storage time and fidelity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If quantum data is stored using electromagnetically induced transparency (EIT) in conventional quantum memories, then storage is achieved, but storage time is limited due to spin decoherence leading to data fidelity degradation

Engineering Contradiction:

Improvestorage timeVSAvoiddata fidelity

Core Design Contradiction:

Duration of action of moving objectVSReliability

Solution Approach 1:

The quantum memory is divided into multiple quantum dots arranged in a heterostructure. Each quantum dot can independently store quantum data, allowing the system to segment the storage function across multiple units. This segmentation enables controlled tunneling between dots to extend storage time while maintaining fidelity through localized error correction in each segment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the physical parameters of the quantum memory system by creating a multiple dot heterostructure with controlled tunneling barriers. By adjusting the tunneling coupling strength and energy levels between quantum dots, the system optimizes both storage time and data fidelity, resolving the contradiction between extended storage duration and maintained reliability.

Inventive Principle:

Principle #35Parameter changes

2Duration of action of stationary object

If storage time is extended in conventional quantum memories, then longer duration is achieved, but data fidelity and quality deteriorate due to spin decoherence

Engineering Contradiction:

Improvestorage durationVSAvoiddata quality

Core Design Contradiction:

Duration of action of stationary objectVSManufacturing precision

Solution Approach 1:

The patent implements localized error correction mechanisms in each quantum dot that provide feedback to maintain data quality. By continuously monitoring and correcting errors in each segment, the system can extend storage duration without compromising data quality, as the feedback loop compensates for decoherence effects that would otherwise accumulate over time.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The controlled tunneling between quantum dots acts as an intermediary mechanism that transfers quantum states while maintaining coherence. This intermediary process allows quantum data to be moved between storage locations without direct exposure to decoherence, enabling extended storage duration while preserving data quality through the protective tunneling pathway.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Length of moving object

If conventional EIT-based quantum memory is used, then quantum data storage is achieved, but communication distance is restricted due to limited storage time

Engineering Contradiction:

Improvecommunication distanceVSAvoidstorage time

Core Design Contradiction:

Length of moving objectVSDuration of action of moving object

Solution Approach 1:

The patent prepares quantum data in a stable stored state in one quantum dot before initiating tunneling to another dot. This preliminary action of pre-storing data in a protected state allows the system to maintain data integrity during the tunneling process, effectively extending the usable storage time and thereby enabling longer communication distances without data degradation.

Inventive Principle:

Principle #10Preliminary 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 significantly increases the storage time of quantum data while maintaining high fidelity, preventing deterioration and enabling longer-distance quantum communication.

Implementation Method 1

Different quantum memories may utilize different techniques for storage of quantum data, such as electromagnetically induced transparency (EIT), atomic frequency comb protocol

Methodology Applied

Scientific EffectElectromagnetically induced transparency:

Implementation Method 2

followed by controlled tunneling between quantum dots to maintain coherence

Methodology Applied

Scientific EffectQuantum tunneling:

Data Source

PatentUS20230325702A1Ultra long storage assisted quantum memory

Publication Date: 2023.10.12 QULABZ INC

AI summary

Techniques for quantum data storage are described. A method for quantum data storage in ultra long storage assisted quantum memory includes obtaining quantum data from an input quantum channel to be stored in a memory unit, storing, intermediately, the quantum data in a first medium of the memory unit for a first pre-determined amount of time, reabsorbing quantum data emitted from the first medium after the first pre-determined amount of time by at least one multiple dot heterostructure of the memory unit, where the at least one multiple dot heterostructure comprises a potential well for storing the quantum data, storing quantum data in the at least one multiple dot heterostructure for a second predetermined amount of time, and performing a controlled tunneling of the quantum data stored in the at least one multiple dot heterostructure.