David Nadlinger (@dnadlinger) header
David Nadlinger (@dnadlinger) profile picture

David Nadlinger

@dnadlinger

Quantum physicist @MertonCollege/@UniofOxford. Programming language geek.

 Oxford, England (he/ħim)
klickverbot.at
Joined September 2009
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Photo by David Nadlinger (@dnadlinger)Photo by David Nadlinger (@dnadlinger)Photo by David Nadlinger (@dnadlinger)Photo by David Nadlinger (@dnadlinger)Photo by David Nadlinger (@dnadlinger)Photo by David Nadlinger (@dnadlinger)Photo by David Nadlinger (@dnadlinger)Photo by David Nadlinger (@dnadlinger)Photo by David Nadlinger (@dnadlinger)Photo by David Nadlinger (@dnadlinger)
Got trust issues? (…regarding your quantum devices?) Our demo of device-independent quantum key distribution (#diqkd) is now out in Nature: "Experimental quantum key distribution certified by Bell's theorem", nature.com/articles/s41586-0… ("free" link: rdcu.be/cSvl4) 1/4
Artist's impression of device-independent quantum key distribution. Both parties control a quantum "box", where a key is assembled bit by bit from measurements on entangled atoms. Optical fibres link the boxes to a central station for the heralded creation of entanglement. (Illustration: Enrique Sahagún/Scixel.)

ALT Artist's impression of device-independent quantum key distribution. Both parties control a quantum "box", where a key is assembled bit by bit from measurements on entangled atoms. Optical fibres link the boxes to a central station for the heralded creation of entanglement. (Illustration: Enrique Sahagún/Scixel.)

One of our ion trap quantum network nodes. The vacuum chamber housing the ion trap, in the centre, is surrounded by a number of laser beam lines that control a single atom confined at the centre of the trap. At the front, the end of the quantum network link connecting it to the other node – an optical fibre – is visible.

ALT One of our ion trap quantum network nodes. The vacuum chamber housing the ion trap, in the centre, is surrounded by a number of laser beam lines that control a single atom confined at the centre of the trap. At the front, the end of the quantum network link connecting it to the other node – an optical fibre – is visible.

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A huge thanks to everyone on our experimental team at @OxfordPhysics, and our theory collaborators at @EPFL_en, @ETH_physics, @unige_en and @CEAParisSaclay – it was greatly rewarding to collaboratively push the state of the art in such an interdisciplinary effort! 4/4
As a humorous perspective, an illustration of device-independent quantum cryptography created by a machine learning model (OpenAI's DALL·E 2).

ALT As a humorous perspective, an illustration of device-independent quantum cryptography created by a machine learning model (OpenAI's DALL·E 2).

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(Oxford colleagues here on Twitter: @gaaraneda @BethNichol5 @dougal_main)
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Replying to @dnadlinger @OxfordPhysics @EPFL_en @ETH_physics @unige_en @CEAParisSaclay
If you are unsure what this #qkd business is all about, might I suggest this brief explanation which I put together when we first released a pre-print version of this manuscript? xitter.cf/dnadlinger/status/1443…
David Nadlinger (@dnadlinger) profile pictureDavid Nadlinger@dnadlinger30 Sep 2021
It's preprint time: device-independent quantum key distribution (DIQKD)! arxiv.org/abs/2109.14600 Together with colleagues from Geneva, Zürich and Paris, we managed to demonstrate DIQKD for the first time, using our two-node ion-trap #quantum network. What is this all about? 1/n
Image from David Nadlinger (@dnadlinger)
Image from David Nadlinger (@dnadlinger)
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Going to be in the US for the first time in a long while for DAMOP end of May. If any quantum/CS/generally awesome people would like to meet up in NYC end of next week (~27th), or in Florida the week after, let me know!
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It's preprint time: device-independent quantum key distribution (DIQKD)! arxiv.org/abs/2109.14600 Together with colleagues from Geneva, Zürich and Paris, we managed to demonstrate DIQKD for the first time, using our two-node ion-trap #quantum network. What is this all about? 1/n
Image from David Nadlinger (@dnadlinger)
Image from David Nadlinger (@dnadlinger)
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… and from EPFL (Lausanne), of course!
This story started with a philosophical debate (EPR paradox, 1935) and evolved into a precise claim about the nature of reality (Bell's theorem, 1964), with recent experiments proving that Nature is really as "weird" as quantum phys predicts (loophole-free Bell tests, 2015). 10/n
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Almost exactly 30 years ago, a tech application for this was proposed in the form of cryptography (Ekert, 1991) – we've now finally shown that this practical to do, with real devices and no extra assumptions. I hope you (and the referees :P) are as excited as all of us are! 11/11
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