Angehefteter Tweet
Really excited to see our manuscript finally online!
arxiv.org/abs/2302.06442
We managed to demonstrate long T2 (34 ms) and big-sized Schrödinger cats (1024 photons). Let me show you how:
1/5
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Bar-χ Guttel
106 posts
Bar-χ Guttel
@barqubit
PhD student @WeizmannScience making superconducting qubits. This account operates strictly in the quantum regime.
Rehovot, Israel Beigetreten Mart 2020
244 Folgt270 Follower
Bar-χ Guttel retweetet
What happens when you open Schrödinger's box not all at once, but gradually? We answered this experimentally- and the answer isn't what anyone expected. 🧵
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@yotamvaknin A crucial fact here!
journals.aps.org/prxquantum/abs…
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The variances add like resistors in parallel (convolution behaves like resistors in series). As a result, the posterior ends up with lower variance than both the prior and the observation!
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I was today-years-old when I noticed that the product (not convolution!) of two Gaussians is also a Gaussian
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Bar-χ Guttel retweetet
I am looking for candidates for a PhD position in my group using superconducting qubits as sensors of fundamental physics, such as dark matter. The position will start in Q1 2026. If you are interested please see the full information here: qct.ifae.es
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Big milestone: IBM Quantum System Two is now live at RIKEN in Kobe and co-located with Fugaku, this system creates a true quantum-centric supercomputing environment.
Grateful to @riken_en , IBM Japan, and our government partners for making this possible. Excited for what’s next.
Link to IBM PR: newsroom.ibm.com/2025-06-23-IBM…
Link to RIKEN PR: riken.jp/pr/news/2025/2…
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Come to my talk at the APS meeting!
@_Dani_Gov_ and I are presenting in a two-part talk our experimental results showing the transition into the quantum jump regime, and the onset of the quantum Zeno effect.
It's going to be great! :)
Monday, session B17.
summit.aps.org/events/MAR-B17…
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Bar-χ Guttel retweetet
Physicists at @WeizmannScience extended the phase coherence time for a superconducting #qubit to 182 microseconds using a new method that monitors the qubit’s environment to minimize decoherence.
Read the paper: go.aps.org/3ZDZfBN
#QuantumComputing
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@AniketMaiti96 I wouldn't go that far, naming different superconducting elements is a lot of fun!
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@barqubit Ah yes the novel KPO, an oscillator that is anharmonic and is (parametrically) driven. Wait do you mean literally every superconducting qubit
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A bit late, but here is my meme-summary for the APS March meeting.
No offense was meant by them, except maybe towards trapped-ions folks...
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Our work is featured in @PhysicsWorld!
New design produces an order of magnitude improvement in single-photon coherence time physicsworld.com/a/novel-superc…
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Bar-χ Guttel retweetet
New manuscript alert! 🎉
We demonstrate the application of active feedback and recover the coherence of a superconducting cavity qubit. Check it out:
arxiv.org/abs/2403.02081
More details will be presented by @RosenblumSerge at @APSMeetings on Thursday at 11:30, session
T47.1
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@mattjmcewen @AEickbusch Great work!
Just a question about the value you use for A in the superconducting gap equation:
The reference you cited mentioned 600 uVnm, whereas you have 900 uVnm. I guess it depends on fabrication but can you give some details?
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Stop worrying about cosmic rays and learn to love gap engineering! arxiv.org/abs/2402.15644 In our new work, we fix the main cause of qubit errors during high-energy impacts on half the qubits in our checkerboard superconducting qubit array. 1/5
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Reminder to make sure your RF components work well in the frequencies of the signals you are using.
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Ran Finkelstein from @IQIM_Caltech talking about atomic arrays. It's always nice to have an eye on the competition...
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Practicality:
Peter Shor@PeterShor1
@chaoyanglu @jenseisert @NobelPrize Four of us won the Breakthrough Prize: Deutch, Bennett, Brassard, and me. Three of us won the BBVA award and a different three won the Dirac Medal. So the pessimist's prediction is that the Nobel Committee will wait for one of us to die, and award the Prize to the survivors.
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Finally out after reviews! 🎉
Feel free to ask your questions here, and may we all have a Shana Tova!
PRX Quantum@PRX_Quantum
A superconducting cavity qubit with coherence time an order of magnitude larger than the state of the art is demonstrated, showing the storage of a Schrödinger cat state with a record size of 1024 photons. @ofirmilul, @barqubit, @RosenblumSerge go.aps.org/45SQ7Ka
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Stop by my presentation today @SQAConference where I will be showing the results from our novel niobium cavity!
Should be around 11:20 Munich time, and also broadcasted on YouTube: @sqaconference" target="_blank" rel="nofollow noopener">youtube.com/@sqaconference
arxiv.org/abs/2302.06442
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Bar-χ Guttel retweetet
And here is a summarizing thread I wrote after the first submission:
twitter.com/barqubit/statu…
Bar-χ Guttel@barqubit
Really excited to see our manuscript finally online! arxiv.org/abs/2302.06442 We managed to demonstrate long T2 (34 ms) and big-sized Schrödinger cats (1024 photons). Let me show you how: 1/5
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We just uploaded a new version of our manuscript to @arxiv!
We slightly revised the main text, and mostly added supplementary information about tons of stuff - loss channels, chonk-state dephasing and more.
Go check it out: scirate.com/arxiv/2302.064…
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