Co-Integrated RTD-HEMT Structure for Low-Power Qubit Pulses
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Solution Overview
Problem
Current quantum computers face scalability issues due to bulky room temperature equipment and high power dissipation in cryogenic qubit control integrated circuits, limiting the ability to efficiently generate high-frequency pulses for qubits in quantum computing systems.
Innovation Solution
A semiconductor device co-integrates a resonant tunneling diode (RTD) and a high-electron-mobility transistor (HEMT) on a substrate, allowing for efficient generation of high-frequency pulses with reduced power consumption by employing a vertically and laterally stacked arrangement, which enables low-power qubit control and readout operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional Si CMOS solutions are used for qubit control, then device compatibility is maintained, but power consumption is high (5-10 times more than RTD-HEMT)
Solution Approach 1:
The patent combines RTD and HEMT into a single co-integrated device structure on the same substrate. The RTD provides negative differential resistance for oscillation while the HEMT provides high electron mobility for low-loss signal transmission, merging frequency generation and amplification functions into one compact unit that reduces overall power consumption by 5-10 times compared to separate CMOS components
Solution Approach 2:
The device uses composite material structures including AlGaAs/GaAs heterostructures for the HEMT and InGaAs/InAlAs quantum well structures for the RTD. These composite semiconductor materials enable simultaneous achievement of high electron mobility in the HEMT channel and resonant tunneling effects in the RTD barrier layers, optimizing both performance and power efficiency
2Adaptability or versatility
If room temperature equipment is used, then operational simplicity is maintained, but scalability is limited due to bulky equipment requirements
Solution Approach 1:
The patent transitions from room temperature operation to cryogenic temperature operation (moving to a different thermal dimension), enabling the device to function efficiently at temperatures below 4K. This temperature dimension change allows the RTD-HEMT to achieve its full potential for high-frequency pulse generation with minimal power consumption, making it suitable for scalable quantum computing systems where thousands of qubits will operate in cryogenic environments
3Area of stationary object
If vertically and laterally stacked arrangement is employed, then co-integration density is improved, but manufacturing complexity increases
Solution Approach 1:
The fabrication process is segmented into distinct stages: first forming the HEMT heterostructure layers on the substrate, then selectively growing RTD quantum well layers in specific regions using molecular beam epitaxy. The template structure with openings and cavities is used to define where RTD layers should be grown, allowing precise spatial segmentation of HEMT and RTD regions while maintaining a relatively simple overall fabrication flow
Solution Approach 2:
The template structure is prepared in advance with pre-defined openings and cavities before RTD layer growth. This preliminary structuring guides the subsequent epitaxial growth process, ensuring that RTD layers form only in the desired locations with correct dimensions, thereby simplifying the manufacturing process by eliminating the need for complex post-growth patterning and alignment steps
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 co-integrated RTD and HEMT semiconductor device achieves significant power efficiency, using up to 5-10 times less power than conventional Si CMOS solutions, facilitating scalable quantum computing by enabling efficient qubit control and readout operations within a cryogenic environment.
Implementation Method 1
a resonant tunneling diode (RTD) and a high-electron-mobility transistor (HEMT) that are co-integrated along a substrate
Implementation Method 2
a resonant tunneling diode (RTD) and a high-electron-mobility transistor (HEMT) that are co-integrated along a substrate
Data Source
AI summary
One or more devices and/or methods provided herein relate to a method for fabricating a semiconductor device having a co-integrated RTD and HEMT. A semiconductor device can comprise an RTD and an HEMT that are co-integrated along a substrate. A fabrication method can comprise providing a heterostructure comprising a plurality of transistor layers of an HEMT, forming on the vertical stack a template structure comprising an opening, a cavity and a seed structure, the seed structure comprising a seed material and a seed surface, and growing a plurality of diode layers of an RTD within the cavity of the template structure from the seed surface, wherein the RTD and HEMT are co-integrated along a substrate.