Key-Based Multi-Qubit Memory for FQHE State Reliability
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Solution Overview
Problem
Current quantum computing devices face challenges in reliably writing and reading quantum bits (qubits) using fractional quantum Hall effect (FQHE) states, particularly in maintaining and manipulating incompressible edge excitations for data storage.
Innovation Solution
The development of a memory structure with laterally confined two-dimensional charge carrier gases in a planar quantum well structure, utilizing an electronic controller to selectively store and read qubit values by transferring charges through channel electrodes, maintaining FQHE states with Landau level filling factors of 5/2 or 12/5, and using keys to identify storage states for accurate read operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If interferometric devices are used to define and manipulate FQHE states for quantum computation, then qubit storage and manipulation capability is enabled, but reliability of writing and reading qubit values deteriorates
Solution Approach 1:
The system divides the quantum memory into multiple independently addressable memory cells, each capable of storing a qubit value. The electronic controller segments the control operations by selectively addressing specific memory cells through controlled charge transfer between channel electrodes, enabling reliable individual cell operations while maintaining overall system functionality.
Solution Approach 2:
The patent introduces an electronic controller as an intermediary between the FQHE state system and the readout mechanism. This controller manages charge transfer operations between channel electrodes to write qubit values to memory cells, and subsequently controls the reduction of gas amounts in specific channels to read values without directly manipulating the fragile FQHE states, thereby improving operational reliability.
2Quantity of substance
If charge transfer between channel electrodes is used to store qubit values in FQHE states, then storage capability is achieved, but risk of altering stored data during read operations increases
Solution Approach 1:
The system performs preliminary charge transfer operations between channel electrodes to write qubit values to memory cells before read operations. The electronic controller tracks the state of each memory cell and uses this information to determine the appropriate read procedure, ensuring that read operations do not inadvertently alter stored data by selecting channels that were not used for the previous write operation.
Solution Approach 2:
The electronic controller implements feedback by monitoring which channel electrodes were used for charge transfer during write operations and using this information to control subsequent read operations. The controller reduces gas amounts in specific channels based on the stored key information about previous write operations, ensuring that read operations target the correct channels without disturbing the stored FQHE states.
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 storage and manipulation of qubit values by maintaining the FQHE state, supporting non-abelian statistics and braiding operations, while ensuring accurate read operations without altering the stored data.
Implementation Method 1
maintaining FQHE states with Landau level filling factors of 5/2 or 12/5
Data Source
AI summary
A memory is capable of storing coupled qubits. The memory includes a plurality of memory cells, wherein each of the memory cells is for storing values of one of the qubits. The memory also includes an electronic controller electrically connected to operate said memory cells. The controller is able to selectively store a qubit value to any of the memory cells in either a first state or a second state. The controller is configured to read any one of the memory cells in a manner dependent on whether the first state or the second state was previously used to store a qubit value in the same one of the memory cells.