Qubit Control via Conditioning Storage Element

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Solution Overview

Problem

Existing methods for initializing and manipulating qubits, particularly singlet-triplet qubits, face challenges in efficiently controlling the qubit states due to the complexity of managing electrical fields and charged particles.

Innovation Solution

The proposed system includes a qubit, electrodes to provide electrical fields, a conditioning storage element within 200 nm of the qubit, and a supplying means to repeatedly apply a predetermined signal to the electrodes. The conditioning storage element holds a varying number of charged particles, allowing the qubit to be brought to different states or phases by altering the electrical field.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional methods are used to initialize and manipulate qubit states through direct electrical field control, then the qubit can be manipulated, but the system complexity and difficulty of control increase significantly

Engineering Contradiction:

Improveease of qubit controlVSAvoidcomplexity of electrical field management

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent introduces a conditioning storage element as an intermediary component positioned near the qubit. This storage element holds charged particles that generate electrical fields to initialize and manipulate qubit states. By using this intermediate storage element, the system simplifies control because the storage element can be charged or discharged to produce the necessary electrical field conditions, rather than directly managing complex electrical field parameters for each qubit operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the conditioning storage element is positioned closer to the qubit to enhance electrical field effect, then the manipulation efficiency improves, but the risk of unwanted interactions and instability increases

Engineering Contradiction:

Improveefficiency of qubit manipulationVSAvoidstability of qubit state

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent optimizes the distance parameter between the conditioning storage element and the qubit to achieve an optimal balance. By positioning the storage element at a specific distance (within 200 nm), the system achieves sufficient electrical field coupling for effective qubit manipulation while maintaining stability and avoiding unwanted interactions. This parameter optimization allows the electrical field from the charged particles in the storage element to effectively influence the qubit state without causing excessive coupling that would lead to instability.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If multiple charged particles are stored in the conditioning storage element to strengthen the electrical field, then the qubit state control precision improves, but the energy consumption and system load increase

Engineering Contradiction:

Improveprecision of qubit state controlVSAvoidenergy consumption of charged particles

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent employs a strategy of using a controlled number of charged particles in the conditioning storage element - sufficient to generate the necessary electrical field strength for precise qubit state control, but not excessive. The system determines the optimal charge level needed for the specific qubit manipulation task and applies only that amount, avoiding unnecessary energy consumption from storing excess charged particles while still achieving the required control precision.

Inventive Principle:

Principle #16Partial or excessive 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 enables precise control over qubit states, allowing for efficient initialization and manipulation, particularly in singlet-triplet qubits, by leveraging the electrical field generated by the charged particles in the conditioning storage element.

Implementation Method 1

a conditioning storage element positioned within a distance of 200 nm from the qubit... while the conditioning storage element comprises a first number of charged particles... while the conditioning storage element comprises a second number of charged particles

Methodology Applied

Scientific EffectElectrical field: Electric Field

Data Source

PatentUS20250139482A1A method of manipulating a qubit and an assembly comprising a qubit

Publication Date: 2025.05.01 QDEVIL APS

AI summary

An assembly comprising a qubit and a method of altering a qubit, where a presence of a charge in a storage element close to the qubit influences on the state in which the altering is performed. Then, altering may be performed by feeding signals to electrodes, where the same signal is fed to the qubit but where the state is altered only if the charge is present in the storage element. Multiple qubits may then receive the same signal and only the ones with a charge are altered by the signal.