MEMS Mirror Interferometry for Fast Qubit Array Addressing
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Solution Overview
Problem
Current methods for optically addressing qubits in quantum computers, such as those using acousto-optic deflectors and spatial light modulators, suffer from limited bandwidth and slow refresh rates, making them unsuitable for fast and scalable quantum gate operations.
Innovation Solution
An interferometric device with independently movable microelectromechanical mirrors is used to spatially phase and intensity modulate light beams, allowing for rapid reconfiguration and precise optical addressing of qubits in a qubit array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If acousto-optic deflectors (AODs) are used for spatial control of optical beams, then optical addressing of qubits is achieved, but the bandwidth for spatial modulation is limited
Solution Approach 1:
The patent replaces acousto-optic deflectors (which use acoustic waves to modulate light) with a purely optical interferometric system using micro-electromechanical mirrors. This substitution eliminates the bandwidth limitations of AODs while maintaining the ability to spatially modulate optical beams for qubit addressing
Solution Approach 2:
The patent employs mirrors that can be independently and rapidly positioned to dynamically control the phase and amplitude of optical beams. This dynamic positioning capability enables high-speed spatial modulation with microsecond response times, significantly improving upon the limited bandwidth of AOD-based systems
2Speed
If spatial light modulators (SLMs) with segmented architecture are used for holographic addressing, then arbitrary qubit illumination patterns can be produced, but the refresh rate is slow (order of milliseconds)
Solution Approach 1:
The patent uses rapidly positionable mirrors with microsecond response times to dynamically generate arbitrary illumination patterns, replacing the slow segmented SLM architecture. The mirrors can be independently controlled to achieve any desired spatial intensity distribution at high speeds
Solution Approach 2:
The patent substitutes the slow electro-optic or liquid-crystal-based SLM mechanism with a fast mechanical mirror positioning system driven by electrostatic actuators, achieving refresh rates orders of magnitude faster while maintaining arbitrary pattern capability
3Speed
If holographic patterns are refreshed at typical rates (couple of milliseconds to ten milliseconds), then qubit addressing is achieved, but the speed is too slow for many quantum computing applications
Solution Approach 1:
The patent implements a dynamic mirror positioning system with microsecond response times, enabling rapid reconfiguration of addressing patterns. The mirrors can be quickly moved between positions to change which qubits are addressed, reducing reconfiguration time from milliseconds to microseconds
Solution Approach 2:
The patent pre-positions mirrors in a configured array where each mirror corresponds to a specific qubit or group of qubits. This preliminary configuration allows immediate addressing of target qubits without requiring time-consuming pattern generation, as the mirrors are already in their required positions
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 system enables fast and precise optical addressing of multiple qubits with a response time of a few microseconds, facilitating high-speed quantum computation by varying light intensity based on mirror positions, thus overcoming the limitations of existing technologies.
Implementation Method 1
interfering the reference light beam and the spatially phase modulated light beam to form an addressing light beam which is spatially intensity modulated
Implementation Method 2
forming: a reference light beam, from at least part of an incident light beam configured for irradiating the interferometric device, and a spatially phase modulated light beam, by applying a phase mask on at least part of the incident light beam with the main array
Data Source
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AI summary
An addressing system (25) for optically addressing qubits (20) in a qubit array (15), comprises an interferometric device (50),the interferometric device (50) comprising a main array (65) of main mirrors (70-i) being independently movable in translation along a longitudinal direction (X) such that the main array (65) is configured for spatial light modulation, the interferometric device (50) being configured for forming a reference light beam (55) from at least part of an incident light beam (45) and a spatially phase modulated light beam (60) by applying a phase mask on at least part of the incident light beam (45) with the main array (65), and for interfering the reference light beam and the spatially phase modulated light beam to form an addressing light beam (40) for irradiating at said qubits (20) with a respective partial addressing light beam (40-i), the intensity of which depends on a position (Xi) of a respective main mirror (70-i) chosen according to addressing data.