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QuTech360 w/ Xin Zhang: Universal control and benchmarking of four singlet-triplet qubits
In this QuTech360 Seminar, Xin Zhang is a postdoc researcher in the Vandersypen group, Quantum Computer Division at QuTech, presents Universal control and benchmarking of four singlet-triplet qubits. For the biography and abstract, please see the description below.
Title:
Universal control and benchmarking of four singlet-triplet qubits
Speaker:
Xin Zhang
Abstact:
The coherent control of interacting spins in semiconductor quantum dots is crucial for quantum information processing and studying quantum magnetism from the bottom up. In this work, we revisit the singlet-triplet qubit in germanium quantum dots and demonstrate universal control of 4 interacting singlet-triplet (S-T-) qubits with baseband-controlled pulses only. We achieve simultaneous initialization, individually control, and sequential measurement of four qubits at magnetic fields as low as 5 mT.
Our experiments show average singlet-qubit gate fidelities well above 99%, verified through randomized benchmarking. Additionally, we investigate swap-like two-qubit gate operations to entangle neighboring qubits, achieving Bell state fidelities ranging from 74% to 90%. By combining these operations, we successfully implement a circuit to generate and distribute entanglement across the array. This results in a remote Bell state between the endpoints of the quantum dot array with a fidelity of 75% and a concurrence of 22%. These findings highlight the potential of singlet-triplet qubits as a competing platform for quantum computing and indicate that scaling up the coherent control of quantum dot spins in extended bilinear arrays can be feasible.
Biography of Xin Zhang:
Xin Zhang is a postdoc researcher in the Vandersypen group at QuTech. He received his PhD degree in Physics at University of Science and Technology of China (2021), where he worked on measuring electron spin relaxation rates and spin-valley mixing in silicon quantum dots. Currently, he is investigating spin control and analog quantum simulation in a 2x4 germanium quantum dot array.
ABOUT QuTech360 Seminars:
QuTech360 is a series of seminars where people from all QuTech divisions have the opportunity to build a deep understanding of the topics researched at QuTech. In each seminar, a quantum expert will guide us through one of the main topics studied in their group.
Visit us at qutech.nl/ and follow us on social media!
Do you want to learn more about quantum?
- take our free online courses: qutechacademy.nl/online-learning/online-courses/
- visit our new quantum learning platform at www.qutube.nl/
Переглядів: 180

Відео

QuTech360 w/Alberto Bordin: Engineering the Kitaev chain
Переглядів 3383 місяці тому
In this QuTech360 Seminar, Alberto Bordin, PhD in Kouwenhoven Lab, Qubit Research Division at QuTech, presents Engineering the Kitaev chain. For the biography and abstract, please see the description below. Title: Engineering the Kitaev chain  Speaker: Alberto Bordin Abstact: This line of research is inspired by the fascinating idea of combining quantum information, typically very fragile, with...
QuTech360 w/ Jiwon Yun: High-fidelity gates for spin qubits in diamond
Переглядів 2344 місяці тому
In this QuTech360 Seminar, Jiwon Yun, PhD in Taminiau Lab, Quantum Internet Division at QuTech, presents High-fidelity gates for spin qubits in diamond. For the biography and abstract, please see the description below. Title: High-fidelity gates for spin qubits in diamond Speaker: Jiwon Yun Abstact: Spin qubits in solid-state materials are gaining significant attention for realizing quantum int...
QuTech360 w/ Aritra Sarkar: Optimal Quantum Firmware Design
Переглядів 3354 місяці тому
In this QuTech360 Seminar, Aritra Sarkar, postdoctoral researcher in the Quantum Machine Learning group (Feld Lab), Quantum Internet Division at QuTech, presents Optimal Quantum Firmware Design. For the biography and abstract, please see the description below. Title: Optimal Quantum Firmware Design Speaker: Aritra Sarkar Abstact: Quantum firmware serves as a crucial link between the mathematica...
State of the art tuning
Переглядів 1978 місяців тому
State of the art tuning
Quantum machine learning
Переглядів 4078 місяців тому
Quantum machine learning
Quantum annealing
Переглядів 9288 місяців тому
Quantum annealing
The first algorithms
Переглядів 1708 місяців тому
The first algorithms
Introduction to quantum algorithms
Переглядів 2428 місяців тому
Introduction to quantum algorithms
Recap: Machine Learning for Semiconductor Quantum Devices
Переглядів 1448 місяців тому
Recap: Machine Learning for Semiconductor Quantum Devices
Overhauser field estimation
Переглядів 1118 місяців тому
Overhauser field estimation
Progress and challenges
Переглядів 1028 місяців тому
Progress and challenges
Quantum error correction
Переглядів 6238 місяців тому
Quantum error correction
Classical error correction
Переглядів 1918 місяців тому
Classical error correction
ML fine tuning of quantum dots
Переглядів 1378 місяців тому
ML fine tuning of quantum dots
Quantum Control Stack for Spin Qubits
Переглядів 3578 місяців тому
Quantum Control Stack for Spin Qubits
Towards universal tuning algorithms
Переглядів 398 місяців тому
Towards universal tuning algorithms
Experimental implementation
Переглядів 488 місяців тому
Experimental implementation
Navigating charge stability diagrams
Переглядів 918 місяців тому
Navigating charge stability diagrams
Neural network tuning
Переглядів 498 місяців тому
Neural network tuning
What is auto tuning
Переглядів 648 місяців тому
What is auto tuning
Autoencoders in QD experiments
Переглядів 758 місяців тому
Autoencoders in QD experiments
Analyse CS diagrams with unsupervised NNs
Переглядів 718 місяців тому
Analyse CS diagrams with unsupervised NNs
Finding operation points example
Переглядів 908 місяців тому
Finding operation points example
Tuning and operation of arrays
Переглядів 668 місяців тому
Tuning and operation of arrays
Auto tuning a quantum computer
Переглядів 1238 місяців тому
Auto tuning a quantum computer
Analyse CS diagrams with clustering
Переглядів 839 місяців тому
Analyse CS diagrams with clustering
Contribution to Ignite
Переглядів 499 місяців тому
Contribution to Ignite
Cryogenic qubit chip carriers
Переглядів 1249 місяців тому
Cryogenic qubit chip carriers
Room temperature electronics
Переглядів 1149 місяців тому
Room temperature electronics

КОМЕНТАРІ

  • @alexansbe
    @alexansbe 2 години тому

    So cool!

  • @gustamanpratama3239
    @gustamanpratama3239 2 дні тому

    👍👍👍👍👍❤❤❤❤❤

  • @Silvertestrun
    @Silvertestrun 16 днів тому

    Thank you

  • @edumilpax
    @edumilpax 16 днів тому

    A little too fast on the explanation

  • @SilverWorld_001
    @SilverWorld_001 17 днів тому

    I love to come on board

  • @ZIONONAZI
    @ZIONONAZI 17 днів тому

    I look forward for this scholarship

  • @nastyavicodin6229
    @nastyavicodin6229 Місяць тому

    Best explanation. Could you please do a video on difference PVM and POVM?

  • @vtrandal
    @vtrandal Місяць тому

    Absolutely fantastic. Thank you.

  • @vtrandal
    @vtrandal Місяць тому

    I will continue watching to see how this turns out. At the beginning of the video, there was a diagram showing FPGA, GPU, Quantum accelerator peripherals. Following that there was a block diagram of a classical computer that was being adapted for Quantum Computing. That feels like too very different approaches.

  • @silverspin
    @silverspin 2 місяці тому

    What a great video <3

  • @mekajyothi1277
    @mekajyothi1277 2 місяці тому

    Is wave function a vector?

  • @user-to3fx2do4d
    @user-to3fx2do4d 3 місяці тому

    I agree with your interpretation of the cat experiment. The Copenhagen interpretation is an unconvincing interpretation that was created as a result of being hesitant about Einstein's idea of wave packets. We should follow Born's probability interpretation.

  • @istvandentora3459
    @istvandentora3459 4 місяці тому

    how does it come out that the probability amplitude of the + state with coefficient 1/2 + e^(i*fi)/2 will be 1/2+cos(fi)/2? Or did you mean that the probability of 0 measurement output will be this much? But then it is a mistake to say that we measure in the X base.

  • @SynaTek240
    @SynaTek240 4 місяці тому

    What is happening with the slide at 4:38 V=phi and the & sign on top of each other, clearly some kind of error

  • @user-cv2tm5hb1i
    @user-cv2tm5hb1i 4 місяці тому

    Amazing, I am speechless how intuitive you made it. Thanks

  • @ONRIPRESENCE
    @ONRIPRESENCE 5 місяців тому

    I'm pretty excited about some new things I learned from this video as I am currently working on cryogenic memory for new architectures with control components. Many thanks. I am aware the Qblox is at the APS March meeting here in Minneapolis, but I wasn't able to make it this year 😅.

  • @prem4302
    @prem4302 6 місяців тому

    Did not explain anyons

  • @freedomnews3877
    @freedomnews3877 6 місяців тому

    Thanks for your video

  • @SampleroftheMultiverse
    @SampleroftheMultiverse 6 місяців тому

    “U” Shape Waves This model may be related to the your topic. ua-cam.com/video/wrBsqiE0vG4/v-deo.htmlsi=waT8lY2iX-wJdjO3 Thanks for your informative and well produced video. You and your viewers might find the quantum-like analog interesting and useful. I have been trying to describe the “U” shape wave that is produced in my amateur science mechanical model in the video link. I hear if you over-lap all the waves together using Fournier Transforms, it may make a “U” shape or square wave. Can this be correct representation Feynman Path Integrals? In the model, “U” shape waves are produced as the loading increases and just before the wave-like function shifts to the next higher energy level. Your viewers might be interested in seeing the load verse deflection graph in white paper found elsewhere on my UA-cam channel. Actually replicating it with a sheet of clear folder plastic and tape. Seeing it first hand is worth the effort.

  • @ribamarsantarosa4465
    @ribamarsantarosa4465 7 місяців тому

    This is the simplest explanation I've seen of something useful that you can do with a quantum computer...

  • @egeerdem8272
    @egeerdem8272 7 місяців тому

    1:15 there must be a mistake regarding charging energies. A 100 times larger radius should result in an energy 100 times smaller (here its 10 times smaller: 30mev/3mev = 10).

  • @parmachine470
    @parmachine470 7 місяців тому

    around 1:40 you are referring to a row vector as a column vector and verse visa.

  • @brendawilliams8062
    @brendawilliams8062 8 місяців тому

    3:34. Believe I would just settle on syncing clocks.

  • @brendawilliams8062
    @brendawilliams8062 8 місяців тому

    If an odd number wasn’t there from factoring and all then trees couldn’t be explained, rught

  • @rakeshrajendran2649
    @rakeshrajendran2649 8 місяців тому

    Way to quantum

  • @paultorreszepeda
    @paultorreszepeda 8 місяців тому

    Excelente recomendación tienes con el ING Jose Alfonso Hernando. El Maestro de maestros Valdeande Magico ... Saludos

  • @valdeandemagico
    @valdeandemagico 8 місяців тому

    Animo Pablo, los BEazcus bajando al mundo cuántico😂

  • @ritwikgarg
    @ritwikgarg 8 місяців тому

    Thank you for explaining this concept so clearly and easily! Very helpful <3

  • @markusborn9290
    @markusborn9290 9 місяців тому

    For M_i where does the factor 1/2 come from? The eigenvector is just (1, i) right?

    • @silvyster9952
      @silvyster9952 8 місяців тому

      note that M_i = |i><i| and since |i> is normally written with a factor of 1/sqrt(2) in front and scalars can be factored out of tensor products he simply skipped a step and multiplied the whole thing by 1/2

  • @hkflo
    @hkflo 9 місяців тому

    Lol what kind of definition is that: coherence is the absence of decoherence. I think a discussion of phase would be helpful here.

  • @robertbarta2793
    @robertbarta2793 9 місяців тому

    I would mark this video more as marketing rather than explanatory. Machinery probably very interesting.

  • @PointlesspeoplePosse
    @PointlesspeoplePosse 9 місяців тому

    Said a whole lot of nothing

  • @kaiwingo5558
    @kaiwingo5558 9 місяців тому

    What’s the catch of Germanium?

  • @wqwq2024
    @wqwq2024 9 місяців тому

    very nice video! looks like a typo at 3:07 mark, c and c^\dagger equations are reversed, provided they are consistent to the gamma equations

  • @DisIsaStickUp
    @DisIsaStickUp 10 місяців тому

    This is really amazing! Why don't more people know about it.

  • @huanganan700
    @huanganan700 10 місяців тому

    video which suits me the best for understanding Deutsch Jozsa!

  • @humbledb4jesus
    @humbledb4jesus 10 місяців тому

    they have done a shit-ton of work simplifying the math somewhat since i graduated astrophysics in '93... i would have done better in linear algebra and statistical mechanics if we had these processes to learn with...

  • @theultimatereductionist7592
    @theultimatereductionist7592 10 місяців тому

    But Psi is just a smooth function solution of the Schrodinger PDE. How does Psi(t,x,y,z) relate to this bra-ket notation?

  • @user-jb1yk3gq6d
    @user-jb1yk3gq6d 11 місяців тому

    Good

  • @lucascaetano3171
    @lucascaetano3171 11 місяців тому

    So nice

  • @futuredave2
    @futuredave2 11 місяців тому

    This may be the lamest possible use for quantum computers. Don’t they have any recipes for mayonaise?

  • @n.songhaha
    @n.songhaha Рік тому

    This is the best explanation I've found. Thank you so much!!!

  • @chenggangyang2241
    @chenggangyang2241 Рік тому

    very very very useful, I finally get how we measure quantum states. Thank you, handsome pal

  • @black56night
    @black56night Рік тому

    At 1:55 did you mean going from Digital to Analogue domains (consistent with eh ADC in the circuit), as opposed to what was said? Very informative video - thank you. 🙂

  • @anndroid8734
    @anndroid8734 Рік тому

    I wonder if it can be used for : 1. universe simulation 2. breaking password & 3. playing chess vs super computer 4. doing my homework 5. mining bitcoin 😅

  • @ritwikgarg
    @ritwikgarg Рік тому

    A very insightful explanation and visualization. I was struggling to understand the axis of rotation for each of the gates, but this video made everything crystal clear. Thank you so much!

  • @percutseituan
    @percutseituan Рік тому

    bisa kah anda menunjukkan alat nyatanya

  • @jacobvandijk6525
    @jacobvandijk6525 Рік тому

    Without any objective background material the series feels like propaganda. By the way, I would have started this series with the double-slit experiment.

  • @jacobvandijk6525
    @jacobvandijk6525 Рік тому

    @ 2:58 As a side note, this is one of the biggest problems in producing a practical quantum computer. And we (= mankind) are still far from solving this problem. The theory is nice, but reality often isn't that nice ;-)

  • @jacobvandijk6525
    @jacobvandijk6525 Рік тому

    But at the moment the execution of this algorithm takes so much time that during processing the state decoheres and the results are useless.