optics challenges in atom-based qt sensors...optics challenges in atom-based qt sensors prof. kai...
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![Page 1: Optics challenges in atom-based QT Sensors...Optics challenges in atom-based QT Sensors Prof. Kai Bongs, University of Birmingham Zeiss Symposium “Optics in the Quantum World”](https://reader034.vdocuments.site/reader034/viewer/2022052006/601a57a945f5697e3a31909d/html5/thumbnails/1.jpg)
Optics challengesin atom-based QT Sensors
Prof. Kai Bongs, University of Birmingham
Zeiss Symposium “Optics in the Quantum World”
18 April 2018
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UK National Quantum Technologies Programme
A five-year £270M (now £380M) programme announced by the UK government in 2013.
Programme started October 2014.
To exploit the potential of quantum science and develop a portfolio of emerging technologies with the potential to benefit the UK.
Industry, government and academia working together to create opportunities for UK wealth creation.
Slide: Courtesy of D. Delpy
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The UK Quantum Technology Hubs
£120M Investment by EPSRC
132 partner companies
PI: Kai BongsUniversity of Birmingham
PI: Tim SpillerUniversity of York
PI: Miles PadgettUniversity of Glasgow
PI: Ian WalmsleyUniversity of Oxford
David DelpyChair of UK QT Strategic Advisory Board
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What we do: Atoms manipulated by laser light
gra
vity
Also possible: rotation, time, magnetic fields,…
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Hub Strategy“Disruptive Innovation Triangle”
Technology
Research User Challenges
Research to
Demonstrate
Benefits
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Hub Strategy
Technology
Research User Challenges
Research to
Demonstrate
Benefits
Supply chain
Components & subsystems
Applications
End-User Systems
Engage the whole
Industrial
VALUE CHAIN
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Roadmaps towards £3bn market opportunity
Atoms sensing
GRAVITY GRADIENTS
£1bn
Atoms sensing
TIME £500M
Atoms sensing
GRAVITY£300M
Atoms sensing
MAGNETIC FIELD£1bn
Atoms sensing
ROTATION£500M
Atoms making
QUANTUMLIGHT£100M
Atoms sensing
THz£400M
Atoms based QT platform
NDT
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Hub-Related UK QT Ecosystem
77 collaborative projects with industry
43 industry partners
£50M project value
9 patent applications
132 Records of invention
50 jobs in industry
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Accelerometer Operation
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Why Cold Atom Quantum Technology?
Already outperform classical counterparts
Huge scaling potential (1000 x better)
Free of mechanical wear
Absolute – i.e. long term stability
Excellent common mode rejection as gradiometer
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Activities and Links
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Miniature Standardised Cold Atom Systems
Laser Systems Grating-MOT Miniature Vacuum
3D printed coils
3D printed magnetic shields
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Demonstrators
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Market Example WP11: QT Gravity Gradient Sensors for Underground Mapping
UK cost of digging up the roads : £5bn/yr
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Functional Brain Imaging
Functional brain imaging currently requires patients to remain still in a highly restricted environment.
These conventional scanners are limited in sensitivity, and some subject groups are excluded – particularly infants
Next generation quantum sensors are allowing a step change in technology – a “wearable” neuroimaging system
Allows scanning of subjects of any age, with free head movement and better sensitivity and spatial resolution compared to conventional systems
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Electromagnetic Imaging with Atomic Magnetometers and Machine Learning
C. Deans, L. D. Griffin, L. Marmugi, F. Renzoni, ArXiv:1710.06629 (2017)
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4 mm: Chosen spatial resolution of the imaging system (pixel size)
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Quantum Sensor Roadmap
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Optics Challenges
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Laser cooling
The Nobel Prize in Physics 1997
"for development of methods to cool and trap atoms with laser light"
S. Chu C. Cohen-Tannoudji
W.D. Phillips
w0
Laser linewidth and absolute frequency stability < MHz (<natural linewidth)For red cooling transition in Sr <kHz !
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How Quantum Sensors work: Gravity
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Measuring Gravity
zgTk zz
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Dropping object next to laser ruler
Accuracy of 1 part in 1010 requires a 1 in 1010 accuracy in laser wavelength!!!
Laser linewidth < 10 kHz
Gravity gradiometers have similar requirements
Also think of power!!!
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Wavefront Effects
Ideal case Realistic case
Detecting 106 atoms delivers shot noise of 1mrad or /1000
Using Entanglement would make this /1000000 !
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Optics Challenges
• Stable lasers – step-change in SWAP-C
• Robust optical delivery (polarisation in fibres vs complexity in free space)
• Low-loss integrated optical components (in particular ms, 100dB switches)
• Recycle optical power and stay frequency agile?
• Ultra-flat wavefront optics (inside or through vacuum)• Could I have those with flat intensity as well, please?