Permanent Magnet Ring Layout for Low-Crosstalk Trapped Qubits
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Solution Overview
Problem
Crosstalk between neighboring trapped quantum particles in quantum computing arrangements is a significant source of error, hindering individual addressing and scalability, and preventing effective quantum error correction protocols.
Innovation Solution
A quantum computing arrangement utilizing a permanent magnet arrangement with a magnetic field gradient enhanced by a soft magnetic material, creating unique equilibrium positions and resonance frequencies for trapped quantum particles, thereby reducing crosstalk and enhancing coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If trapped quantum particles are positioned close to each other to enable coupling and entanglement, then quantum computing operations can be performed, but crosstalk between neighboring particles increases causing errors and preventing individual addressing
Solution Approach 1:
The patent applies local quality by creating a magnetic field gradient where each trapped quantum particle experiences a unique local magnetic field strength. This gradient ensures that particles at different positions along the first axis have distinct resonance frequencies, enabling individual addressing without crosstalk while maintaining close proximity for coupling. The magnetic field magnitude varies locally across the particle array, providing position-dependent control.
Solution Approach 2:
The patent utilizes parameter changes by varying the magnetic field strength across different positions in the trapping region. By employing a magnetic multipole field (particularly quadrupole) that creates a gradient in magnetic field magnitude, each particle experiences a different field parameter (strength), which translates to unique resonance frequencies. This parameter variation enables selective addressing while maintaining particle coupling.
2Reliability
If a magnetic field gradient is applied to enable individual addressing of trapped quantum particles, then crosstalk is reduced, but the complexity of the magnetic field configuration increases
Solution Approach 1:
The permanent magnet arrangement serves multiple functions simultaneously: it generates the magnetic field gradient for individual particle addressing, provides the necessary coupling between particles for entanglement, and establishes unique resonance frequencies for each particle. This multi-functionality reduces overall system complexity by combining several required functions into a single magnetic field configuration.
Solution Approach 2:
The patent introduces a soft magnetic material as an intermediary element that enhances and shapes the magnetic field gradient generated by the permanent magnets. This intermediary component amplifies the field gradient effect, improving individual particle addressing while allowing the permanent magnet arrangement to maintain a relatively simple geometric configuration.
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
The solution provides improved controllability and lower crosstalk, enabling faster quantum operations and reduced error correction needs, allowing for advanced addressing and stronger couplings between quantum particles.
Implementation Method 1
The permanent magnet arrangement is configured to generate a magnetic multipole field. In particular, a magnetic quadrupole field is generated wherein in a centre of the permanent magnet arrangement the magnitude of the magnetic field is vanishing
Implementation Method 2
the magnitudes of the magnetic field for different positions on the first axis are characteristic for a magnetic field gradient along the first axis
Implementation Method 3
the soft magnetic material is configured to enhance the magnetic field established by the permanent magnet arrangement... the soft magnetic material is configured to enhance the magnetic field established by the permanent magnet arrangement
Implementation Method 4
creating unique equilibrium positions and resonance frequencies for trapped quantum particles
Implementation Method 5
For charged trapped quantum particles, an interaction as e.g. Coulomb repulsion creates a coupling of neighbouring trapped quantum particles and enables entanglement
Data Source
AI summary
In an embodiment a quantum computing arrangement includes a permanent magnet arrangement configured for establishing a magnetic field with magnitudes different from one another for different positions on a first axis, a space for at least two trapped quantum particles arranged along the first axis and a soft magnetic material surrounded by the permanent magnet arrangement, the soft magnetic material configured for enhancing the magnetic field, wherein the permanent magnet arrangement comprises a plurality of segments, wherein each segment has a magnetisation direction, and wherein the segments surround the space in form of a ring, or wherein the segments surround the space in form of a contour of a polygon.