Excitonic BEC Qubits in Semiconductor Nanostructures With Long Coherence
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Solution Overview
Problem
Current quantum technologies face challenges in generating long-lived, stable Qubits at reasonably high temperatures for practical applications due to the short-lived nature of excitons and the need for complex, costly equipment like ultrafast lasers, limiting scalability and portability.
Innovation Solution
The method involves using Bose-Einstein Condensates of excitons in low-dimensional semiconductor nanostructures, which can be controlled using bias voltage and light, allowing for the generation of macroscopic quantum states that sustain coherence for microseconds or milliseconds, and can be integrated with semiconductor fabrication for miniaturized and portable devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional quantum technologies use ultrafast lasers and external optical microcavities to control quantum states, then quantum coherence can be maintained, but the device complexity and cost increase significantly
Solution Approach 1:
The patent extracts and eliminates the external optical microcavity and ultrafast laser components from the quantum system. By using excitons confined within semiconductor quantum wells, the system achieves quantum coherence without requiring external high-finesse optical cavities or ultrafast laser equipment, thereby simplifying the device architecture while maintaining quantum state stability
Solution Approach 2:
The semiconductor quantum well structure provides self-contained quantum confinement and exciton generation capabilities. The material structure itself serves as both the quantum state host and the control mechanism, eliminating the need for external service equipment like ultrafast lasers and external microcavities, making the system self-sufficient and easier to manufacture
2Productivity
If excitons are used as qubits with conventional methods, then quantum computation can be performed, but the exciton lifetime remains extremely short (pico-seconds)
Solution Approach 1:
The patent changes the physical parameters of exciton confinement by using quantum wells with specific thicknesses and material compositions. This modifies the exciton energy levels and reduces their interaction with phonons and other decoherence sources, extending the exciton lifetime from picoseconds to microseconds or longer, enabling practical quantum computation operations
Solution Approach 2:
The patent utilizes the phase transition behavior of excitons in quantum wells, particularly the transition from free excitons to bound exciton pairs or excitonic condensates at specific temperature and density conditions. This phase transition stabilizes the quantum states and extends their coherence time, allowing for sustained quantum computation
3Adaptability or versatility
If existing quantum technologies are implemented, then quantum phenomena can be exploited, but scalability and portability are limited due to sophisticated laboratory requirements
Solution Approach 1:
The patent replaces complex mechanical and optical systems (ultrafast lasers, optical microcavities, precision alignment mechanisms) with a solid-state semiconductor quantum well structure. This substitution enables quantum phenomena to be exploited using standard semiconductor fabrication techniques, dramatically improving scalability and portability while maintaining quantum functionality
Solution Approach 2:
The semiconductor quantum well structure serves multiple functions simultaneously: it confines excitons, provides quantum state definition, enables optical excitation and detection, and offers integration compatibility with standard electronics. This multi-functionality allows a single platform to address multiple quantum technology requirements, enhancing versatility and ease of manufacture
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 enables efficient, fault-tolerant quantum computation and scalable production of portable quantum devices, eliminating the need for costly and complex equipment, while maintaining quantum coherence for extended periods.
Implementation Method 1
extreme photoexcitations using high powered lasers for an optoelectronic device which includes a semiconductor layer having electron-hole liquid at an ambient temperature
Implementation Method 2
Bose-Einstein Condensate (BEC) of excitons (as a bound state of electron-hole pairs within a solid) as Quantum bits (Qubits)
Data Source
AI summary
The present disclosure provides method and system, which use multiple of excitonic BEC(s) and/or excitonic matter-wave(s) and/or excitonic superfluid(s) as a platform to generate multiple (from a few to even millions or more) long-lived Qubits in any conceivable multi-dimensional hybrid nano structure(s), mostly using semiconductor material(s) and/or device structure(s) at any temperature in between 0-500K, and that can sustain any quantum coherence for a much longer time scales of microseconds or milliseconds or even more, but not limited to these time scales for any conceivable faster device operation(s) as well. The macroscopic quantum states of the generated Qubits are easily controllable with applied voltage(s) (dc and/or ac) and/or electrical power, and/or light beam(s), and are easily integrated with semiconductor fabrication techniques for quicker and wider adaptation of Quantum technologies.