Quantum Dot Two-Qubit Gates With Sine-Squared Coupling Control
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Solution Overview
Problem
Current quantum computing methods for two-qubit quantum gates suffer from low fidelity due to noise and cross-talk errors, limiting their effectiveness in quantum computing operations.
Innovation Solution
The implementation of a quantum computing system that uses a coupling signal and a specific waveform of the magnetic field to perform two-qubit gate operations with high fidelity, optimizing the control signals and magnetic field configurations to minimize errors and enhance gate performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current experimental methods are used for two-qubit quantum gates, then the gate operation can be performed, but the fidelity is limited due to noises and cross-talk errors
Solution Approach 1:
The patent applies parameter changes by optimizing the magnetic field waveform parameters (using sine-squared envelope functions with specific duration and amplitude) and coupling signal parameters to achieve high-fidelity two-qubit gates. By carefully tuning these parameters, the system achieves fidelities exceeding 99% while minimizing the impact of noises and cross-talk errors through precise control rather than brute-force error suppression
2Duration of action of moving object
If standard two-qubit gate operations are used, then quantum computation can proceed, but errors accumulate limiting reliable circuit depths
Solution Approach 1:
The patent implements preliminary action by pre-characterizing the noise environments and cross-talk patterns specific to each qubit pair before performing computations. This allows the system to pre-optimize gate parameters and select optimal gate sequences that inherently resist error accumulation, enabling reliable circuit depths to extend significantly beyond what is achievable with standard gate operations
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 improves the fidelity of two-qubit gate operations, increasing reliable circuit depths and reducing the number of physical qubits required for large-scale fault-tolerant quantum computation.
Implementation Method 1
applying a magnetic field according to a two-qubit gate operation performed with a quantum device
Implementation Method 2
transmitting a voltage signal to a gate structure, arranged above first and second quantum dots in the quantum device, to generate a coupling signal
Data Source
AI summary
A method is provided, including: applying a magnetic field according to a two-qubit gate operation performed with a quantum device; transmitting a voltage signal to a gate structure, arranged above first and second quantum dots in the quantum device, to generate a coupling signal that includes a first sine squared wave; and performing, by the magnetic field and the coupling signal, the two-qubit gate operation to the first and second qubits in the first and second quantum dots.