Turning mirrors, for a more efficient life. Quantum optics and quantum information @ DTU Physics.

Virum, Denmark
Joined February 2009
Jonas Neergaard-Nielsen retweeted
🗺️「れきちず」機能紹介🏯 江戸時代の地図と現在の地図を2画面で比較して見られます。 上下・左右に分割できるほか、丸いスコープで比較する機能があります🔍 rekichizu.jp/map
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Jonas Neergaard-Nielsen retweeted
This is Algebrica. A mathematical knowledge base I’ve been building for 2.5 years. 215+ entries, carefully written and structured. 400k+ views over this time. Not much in absolute terms, but meaningful to me. No ads. No courses to sell. No gamification. No distractions. Just essential pages, aiming to explain mathematics as clearly as possible, for a university-level audience. Built simply for the pleasure of sharing knowledge. Content licensed under Creative Commons (BY-NC). Best experienced on desktop. If it helps even a few people understand something better, it’s worth it.
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Jonas Neergaard-Nielsen retweeted
Four years ago I woke up at 5 am from distant explosions. I asked my boyfriend if he heard them too, he said he didn’t and I should go back to sleep. I tried to calm myself down, went on the internet, it was silent, no news or explanations.
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Jonas Neergaard-Nielsen retweeted
NYU Professor @JonHaidt has written one of the most important books of our time, "The Anxious Generation", so I jumped at the chance to work with him on a rap video about the key ideas. The graphs come from Jon's lecture slides; pause and take them in, and shut the phones off!
Artists see the damage to creativity wrought by the phone-based life. A rap artist--@BabaBrinkman --created this powerful video for The Anxious Generation . To my amazement he incorporated something from every chapter. Thank you, Baba! youtube.com/watch?v=P3tF8oSg…
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Jonas Neergaard-Nielsen retweeted
Støt den danske Ukraine komité - vis det ikke bare er snak. MobilePay 924084. Hver eneste krone går direkte til det ukrainske forsvar. Og del dette tweet for at hjælpe. Til så mange som overhovedet muligt.
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Jonas Neergaard-Nielsen retweeted
I am incandescent with rage right now. I feel sick to the stomach. A US Vice President stood today on the soil of where so many Americans gave their lives to defeat fascism in Europe. He delivered a disgraceful speech that spat on their graves. Not that we should expect any different, given his boss skipped visiting the graves of fallen Americans in Europe for fear of getting his hair wet. The same man who called the same fallen heroes suckers and losers. As a Brit that loves America and the American people, I am deeply disturbed at the insults delivered by a man who once described Donald Trump as an “idiot" and said he was "reprehensible." Privately, comparing him to Adolf Hitler. How times have changed. Vance is now part of the most authoritarian administration in American history. An administration actively seeking to deny bodily autonomy to women. An administration pursuing the same mass deportation of immigrants that Europe witnessed in 1930s Germany. Vance is a man that his own president doesn’t even see as his successor. He came to Europe to vomit his Christo-fascist bile on leaders from the UK and across Europe, in what appears to be a retribution tour designed to assert American power. The U.S. are to my knowledge the only NATO country to have invoked Article 5 of the NATO charter after 9/11. We, his European allies, met that call with no questions asked. We sent thousands of soldiers to the battlefields of Afghanistan and Iraq to fight a war on the false premise of Donald Rumsfeld’s ‘known unknowns’. We did this despite millions of our own citizens protesting in the streets of our cities. Our military stood shoulder to shoulder with his military and we, like many Americans, stood to salute our fallen young men and women returning home day after day. I have tears in my eyes as I write this, thinking of them and their loved ones. Our brave men and women willingly gave their all and far too many made the ultimate sacrifice in support of an American led war. For the record, 6000 Ukrainian solders server alongside American soldiers in Iraq. This, despite Ukraine not being a member of NATO. In 1994 upon signing the Budapest Memorandum they gave up their nuclear weapons in return for security assurances from the US and the UK. These were then reneged upon in 2014 when Russia invaded Crimea. They were told ‘An assurance is not a guarantee’. Now, despite their friendship and their brave sacrifice on the battlefields of Ukraine, the President of the United States has decided to abandon them and hand a victory to an indicted war criminal, who illegally invaded the sovereign territory of a US ally. An ally who’s soldiers had previously lost their lives supporting America in its war on terror. SHAME ON HIM. Shame on the man who dodged the draft and never served a day in defense of his nation. He is a coward and I would gladly call him that to his face. To all those Americans on social media currently posting vile insults to those who have always been there for America, I say, democracy is bigger than you, as you sit anonymously behind your phones posting poison. America might have the most powerful army on the planet, but remember, that same army fled from Saigon after being handed their ass by a bunch of peasant rice farmers, armed with grenades made from discarded US coke cans. Ukraine have been to the Russian army what the Vietnamese were to you and we salute them. You might want to throw Ukraine under the bus while stealing there mineral deposits, BUT EUROPE WILL NOT ALLOW THAT TO HAPPEN. I know for sure that the UK will not abandon the Ukrainian people. Our aid to GDP contribution already exceeds that of the US as does Poland, Germany Finland and others. The U.S. is no longer a reliable ally and if need be, we will stand with Ukraine without America. As for your pathetic tariffs, do your worst. You will soon have no friends but thugs and autocrats, so I’m sure Wun Dum Fuc will be right at home.
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#TsuchinshanATLAS from Weissenhäuser Strand, Germamy
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Postdoc positions available in our amazing photonic quantum computing team at Technical University of Denmark! Application deadline 1. September. Gaussian Boson Sampling and similar protocols. Bulk optics: efzu.fa.em2.oraclecloud.com/… Integrated optics: efzu.fa.em2.oraclecloud.com/…
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Marie Curie did not have to fit 9 deliverabkes, 17 milestones and 44 tasks in a 24 months gantt chart as we, who got the grant in her name, have to do
Slow productivity: do fewer things, work at a natural pace and obsess over quality go.nature.com/3LTbdQn
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Jonas Neergaard-Nielsen retweeted
Today is exactly 10 years since the @TIME magazine covered the greatest quantum computing company of all times (after @DulwichQuantum), @DWaveQuantum. Let's take a trip down the memory lane and remind ourselves of the early days of quantum computing hype. content.time.com/time/subscr…
See @TIME's new cover: The Infinity Machine, looking at the new frontier of quantum computers ti.me/1etzXun
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Jonas Neergaard-Nielsen retweeted
Last January, I noticed something peculiar in my 2yo’s bedroom that - after a year of obsessive reporting - led me to a profound cosmic revelation about what’s even possible in our universe. A 🧵.
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Jonas Neergaard-Nielsen retweeted
Well, that's it. I've peaked in life having been cited in XKCD *and* making it into the alt text. Going to retire to nerd heaven now. xkcd.com/2886/
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Jonas Neergaard-Nielsen retweeted
Why i've been particularly behind on emails : A serious re-addiction to coding , thanks to @openai. At the time of #ChatGPT release, I was working w/ Dr Donnie Keathley on the new course notes for MIT EECS' brand-new "6.2410 Quantum Engineering Platforms" ....
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Jonas Neergaard-Nielsen retweeted
Towards provably efficient quantum algorithms for large-scale machine-learning models nature.com/articles/s41467-0…
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Jonas Neergaard-Nielsen retweeted
Quality software deserves your hard‑earned cash Quality software from independent makers is like quality food from the farmer’s market. A jar of handmade organic jam is not the same as mass-produced corn syrup-laden jam from the supermarket. Industrial fruit jam is filled with cheap ingredients and shelf stabilizers. Industrial software is filled with privacy-invasive trackers and proprietary formats. Google, Apple, and Microsoft make industrial software. Like industrial jam, industrial software has its benefits — it’s cheap, fairly reliable, widely available, and often gets the job done. Big tech companies earn hundreds of billions of dollars and employ hundreds of thousands of people. When they make a new app, they can market it to their billions of customers easily. They have unbeatable leverage over the cost of developing and maintaining their apps. Independent software makers are small teams that don’t have those economies of scale. They can try to compete on price by compromising their craft, or they can charge a fair price knowing this will drive a large number of people to choose big tech instead. Either way, big tech wins because they take a 20–30% cut of the app store money earned by most independent makers. A cost that the big tech companies do not incur. Big tech companies have the ability to make their software cheap by subsidizing costs in a variety of ways: - Google sells highly profitable advertising and makes its apps free, but you are subjected to ads and privacy-invasive tracking. - Apple sells highly profitable devices and makes its apps free, but locks you into a proprietary ecosystem. - Microsoft sells highly profitable enterprise contracts using a bundling strategy, and makes its apps cheap, also locking you into a proprietary ecosystem. Some tech companies raise hundreds of millions of dollars from venture capital investors, and use this money to subsidize pricing — until the money runs out, and the quality soon declines. I’m not saying these companies are evil. But their subsidies create the illusion that all software should be cheap or free. Industrial software has become so incredibly cheap that most of us have lost the sense for how much value a quality piece of software can provide. We have become numb to the taste of good software and hypnotized by the idea of “free”. I’m not sure why, but we seem more willing to spend money on good fruit jam than on good software. I notice that I spend less on personal software than I do on groceries and many basic things. Yet software is one of the few things I pay for that truly gives me leverage. Consider its cost per use. Independent makers of quality software go out of their way to make apps that are better for you. They take a principled approach to making tools that don’t compromise your privacy, and don’t lock you in. Independent software makers are people you can talk to. Like quality jam from the farmer’s market, you might become friends with the person who made it — they’ll listen to your suggestions and your complaints. If you want to live in a world with more than a handful of software makers, then spend a bit more on quality independent software. It deserves your hard-earned cash.
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Jonas Neergaard-Nielsen retweeted
Årets Nobelpristagare i fysik föreläser för oss efter (!!) att hon blev meddelad om att hon vann!!
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Jonas Neergaard-Nielsen retweeted
It turns out that sparkling water and raisins are *fascinating*. My daughter and I happened upon this effect playing together in the kitchen a long time ago, and I couldn't help but explore the system more deeply... 1/n arxiv.org/abs/2308.12927
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Jonas Neergaard-Nielsen retweeted
New experimental results out today with collaborators from @QTL_Chalmers! We measure the long sought-after cubic phase state that is obtained by applying the cubic Hamiltonian x³ to an initial squeezed state, by engineering the cubic gate explicitly! scirate.com/arxiv/2308.15320 (1/7)
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Jonas Neergaard-Nielsen retweeted
I've put my lecture notes from my Fall 2022 Quantum Computation course online. math.mit.edu/~shor/435-LN/ I don't guarantee that there aren't any mistakes left in them, although I've tried to eradicate them all. If you find any, feel free to email me.
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Jonas Neergaard-Nielsen retweeted
You know what I think about a lot? That time that Hayao Miyazaki was shown an AI demonstration and replied simply with “I strongly feel that this is an insult to life itself.”
Apple's Vision Pro comes with EyeSight, a feature that reveals your eyes when with another person, hides them when you're immersed in VR and blends the real world in as it appears before you. #WWDC23 tcrn.ch/3WMFTYh
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