On-Chip Lossy Resonators for Fast Qubit Reset and Low Crosstalk
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Solution Overview
Problem
Existing quantum computing systems require at least about 160 ns to reset measure qubits, which is not scalable due to high error rates, and suffer from crosstalk issues caused by off-chip energy-absorbing elements shared by multiple qubits.
Innovation Solution
Incorporating on-chip lossy resonators with dedicated dissipative elements for each qubit, reducing the reset time to about 50 ns or less and minimizing crosstalk by eliminating shared coupling channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If off-chip energy-absorbing elements are used for qubit reset, then the reset function can be achieved, but crosstalk issues occur due to shared coupling channels
Solution Approach 1:
The patent divides the shared off-chip energy-absorbing element into multiple dedicated on-chip dissipative elements, with each qubit having its own dedicated dissipative element. This segmentation eliminates the shared coupling channel that causes crosstalk while maintaining the energy absorption function for each qubit independently.
Solution Approach 2:
The patent extracts the dissipative function from the off-chip energy-absorbing element and integrates it directly onto the chip as dedicated dissipative elements coupled to each qubit. This extraction removes the harmful shared coupling channel while preserving the essential energy absorption capability needed for qubit reset.
2Reliability
If conventional reset methods are used, then qubit reset can be performed, but the reset time is at least about 160 ns which is not scalable
Solution Approach 1:
The patent replaces the conventional slow reset mechanism with a dedicated on-chip dissipative element that provides a direct energy absorption path for each qubit. This substitution of the reset mechanism reduces the reset time from at least 160 ns to a faster timescale, enabling scalable quantum computing operations.
3Loss of time
If on-chip lossy resonators with dedicated dissipative elements are used, then reset time is reduced to about 50 ns or less, but device complexity increases
Solution Approach 1:
The patent merges the dissipative element directly with the qubit circuitry on the same chip, combining the quantum computation function with the energy dissipation function in an integrated structure. This merging reduces the need for external components and interconnections, making the increased complexity manageable while achieving the faster 50 ns or less reset time.
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 enables scalable quantum computing by achieving rapid qubit reset times and significantly reducing crosstalk, thereby improving the efficiency and reliability of quantum error correction algorithms.
Implementation Method 1
The first dissipative element is enabled to dissipate the energy associated with the one or more excited states to a portion of the substrate
Data Source
AI summary
A quantum computing system includes a cryogenic chamber and an integrated circuit located in the chamber. The integrated circuit includes a substrate, a qubit formed on the substrate, and a dissipative element that is formed on the substrate and coupled to the qubit. When the qubit is tuned to a first flux value, the integrated circuit is enabled to perform quantum-computation operations on a set of quantum states of the qubit. The quantum states include a ground state and an excited state. When the qubit is tuned to a second flux value, the qubit is enabled to transfer energy associated with the excited state from the qubit to the dissipative element. Upon the energy transfer, the qubit is transitioned to the ground state. The dissipative element is enabled to dissipate the transferred energy to a portion of the substrate.