Ion Trap Magnetic Gradient Layout for Individual Qubit Addressing
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Solution Overview
Problem
Crosstalk between neighbouring trapped ions in quantum computing processes is a difficult source of error, preventing effective quantum error correction and scalability in quantum computers.
Innovation Solution
A quantum computing arrangement using a permanent magnet arrangement to generate a magnetic field with varying magnitudes along an axis, allowing for individual addressing and control of trapped ions through frequency differences, enabling advanced addressing and coupling of ions for quantum computation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a uniform magnetic field is used for trapping ions, then the ion trap structure is simple, but individual addressing of ions becomes difficult due to crosstalk between neighbouring ions
Solution Approach 1:
The patent applies local quality by creating spatially varying magnetic field characteristics through the permanent magnet arrangement. The magnetic field magnitude varies along the first axis, with different positions experiencing different field strengths. This spatial variation in magnetic field properties enables position-dependent addressing of ions, allowing individual ion control without requiring complex additional structures.
2Device complexity
If the magnetic field magnitude is uniform along the first axis, then the permanent magnet arrangement is simple, but frequency differences between neighbouring ions cannot be achieved for individual addressing
Solution Approach 1:
The patent implements parameter changes by varying the magnetic field magnitude along the first axis through the permanent magnet arrangement. This creates position-dependent Larmor frequencies for ions at different locations. The frequency variation enables selective addressing of individual ions or ion groups by tuning the driving frequency, achieving precise frequency discrimination without complicating the magnet arrangement.
3Productivity
If neighbouring ions are strongly coupled for quantum gates, then quantum computation capability is improved, but crosstalk increases making error correction difficult
Solution Approach 1:
The patent applies local quality by creating spatially selective coupling regions through the position-dependent magnetic field. Ions at different positions along the first axis experience different magnetic field magnitudes, enabling selective coupling between specific ion pairs while maintaining isolation of others. This spatial selectivity allows quantum gate operations between targeted ions without introducing crosstalk to neighbouring ions, preserving system reliability for error correction.
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 enhances controllability and reduces cross-talk, facilitating high-fidelity quantum computations by allowing for individual qubit rotations and efficient multi-qubit gates, supporting scalable quantum computers.
Implementation Method 1
a permanent magnet arrangement configured to establish a magnetic field with magnitudes being different from one another for different positions on a first axis
Implementation Method 2
The permanent magnet arrangement is configured to generate a magnetic multipole field. In particular, a magnetic quadrupole field is generated at a centre of the permanent magnet arrangement
Implementation Method 3
For charged trapped ions, an interaction as e.g. Coulomb repulsion creates a coupling of neighbouring trapped ions and enables entanglement
Data Source
AI summary
In an embodiment a quantum computing arrangement includes a permanent magnet arrangement configured to establish a magnetic field with magnitudes being different from one another for different positions on a first axis, and an ion trap having a first region and a second region arranged above one another, wherein the ion trap has at least one section being part of the first region and the second region configured for hosting at least one ion crystal, wherein the first and second regions are stacked above one another in a vertical direction, wherein the vertical direction is perpendicular to a main extension plane of the ion trap, and wherein the at least one ion crystal includes a plurality of trapped ions arranged along the first axis.