Flux-Tunable Qubit-Bus Architecture for Flux Noise Insensitivity
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Solution Overview
Problem
Existing qubit architectures are susceptible to flux noise due to imprecision in fabrication, leading to increased gate errors and decreased efficiency, as it is difficult to fabricate qubits within the sweet spot region where they are 1st order insensitive to flux noise.
Innovation Solution
Capacitively couple a flux tunable qubit to a flux tunable bus, allowing both to be tunable, which enables flexibility and reduces noise sensitivity by adjusting frequencies through flux pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If qubits are fabricated using existing fabrication processes, then manufacturing is feasible, but manufacturing precision is insufficient leading to qubits falling outside the sweet spot region
Solution Approach 1:
The patent applies preliminary action by designing the qubit architecture with built-in flux tunability from the outset, rather than attempting to achieve precise frequencies through fabrication alone. The flux tunable element is integrated into the qubit design beforehand, allowing frequency adjustment after fabrication to compensate for manufacturing variations and place the qubit within the sweet spot region.
Solution Approach 2:
The patent employs parameter changes by introducing flux tunability as a controllable parameter. By applying magnetic flux through the flux tunable element, the qubit frequency can be dynamically adjusted to achieve the desired operating point within the sweet spot region, compensating for fixed fabrication imperfections.
2Reliability
If qubits operate outside the sweet spot region, then fabrication is easier, but reliability decreases due to increased flux noise sensitivity
Solution Approach 1:
The flux tunable element is built into the qubit architecture in advance, enabling the system to proactively adjust to noise conditions. This preliminary design allows the qubit to be tuned to the sweet spot region where first-order sensitivity to flux noise is minimized, thereby improving reliability and gate fidelity.
Solution Approach 2:
The patent introduces dynamic flux tunability that allows the qubit frequency to be adjusted in real-time. This dynamic capability enables the system to adapt to varying noise conditions and maintain operation within the sweet spot region, thereby reducing flux noise sensitivity and improving gate fidelity.
3Adaptability or versatility
If fixed frequency qubits are used, then device complexity is reduced, but adaptability decreases limiting flexibility in quantum gate operations
Solution Approach 1:
The flux tunable element serves multiple functions: it enables frequency adjustment for sweet spot operation, provides noise suppression, and allows dynamic tuning for different quantum gate operations. This multi-functionality increases adaptability without proportionally increasing complexity, as a single element achieves multiple objectives.
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 reduces noise sensitivity and increases gate fidelity by tuning qubits to specific frequencies, creating scalable quantum gates with low error rates and resistance to flux noise.
Implementation Method 1
adjusting frequencies through flux pulses
Implementation Method 2
capacitively couple a flux tunable qubit to a flux tunable bus
Data Source
AI summary
One or more systems, devices, methods of use and/or methods of fabrication provided herein relate to a quantum computing device that can operated to have 1st order insensitivity to flux noise. According to one embodiment, a device comprises a flux tunable qubit capacitively coupled to a flux tunable bus. According to another embodiment, a device comprises a flux tunable qubit capacitively coupled to a flux tunable bus, wherein the flux tunable bus is capacitively coupled a fixed frequency qubit.