Josephson Junction Nonlinear Oscillator for Fast Quantum Gate Operations
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Solution Overview
Problem
Existing calculating devices using multiple quantum nonlinear oscillators are not fast enough for efficient operations.
Innovation Solution
A calculating device incorporating a nonlinear oscillator with a circuit part including Josephson junctions and a conductive member, where an electrical signal with specific frequency components is applied to control the oscillation state, enabling faster X-rotation gate operations by utilizing a Kerr-nonlinear parametric oscillator bifurcation phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple quantum nonlinear oscillators are used in the calculating device, then the device can perform quantum computing operations, but the operation speed is insufficient
Solution Approach 1:
The patent changes the frequency parameters of the electrical signal applied to the nonlinear oscillator. By setting the first frequency to 2 times the oscillation frequency and controlling the frequency difference between the first and second frequency components, the system achieves rapid state transitions while maintaining quantum computing fidelity through precise parameter control.
Solution Approach 2:
The patent applies periodic electrical signals with specific frequency components to the nonlinear oscillator. The first signal includes a first frequency component at 2 times the oscillation frequency and a second frequency component with a controlled frequency difference, creating periodic driving that enables fast and reliable quantum gate operations.
2Speed
If the first frequency is set to 2 times the oscillation frequency with a controlled frequency difference, then fast state transitions are achieved, but the signal complexity increases
Solution Approach 1:
The patent segments the electrical signal into distinct frequency components: a first frequency component at 2 times the oscillation frequency and a second frequency component with a specific frequency difference. This segmentation allows independent control of each component's amplitude and phase, simplifying the generation of complex signals that achieve fast state transitions.
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 device achieves quick transitions between states, enhancing the speed of operations and fidelity of quantum computing processes.
Implementation Method 1
a circuit part (12) including a first Josephson junction (11a) and a second Josephson junction (11b)
Implementation Method 2
enabling faster X-rotation gate operations by utilizing a Kerr-nonlinear parametric oscillator bifurcation phenomenon
Data Source
AI summary
According to one embodiment, a calculating device includes a nonlinear oscillator. The nonlinear oscillator includes a circuit part including a first Josephson junction and a second Josephson junction, and a conductive member including a first terminal. An electrical signal is input to the first terminal. The electrical signal includes a first signal in a first operation. The first signal includes a first frequency component having a first frequency, and a second frequency component having a second frequency. The first frequency is 2 times an oscillation frequency of the nonlinear oscillator. An absolute value of a difference between the first frequency and the second frequency is not more than 0.3 times the first frequency.