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QuTech Academy
Netherlands
Приєднався 2 лип 2017
QuTech is a front-runner in the field of quantum computing and quantum internet and has the window of opportunity to become the world leader in the field of quantum. Chances are that the first quantum computer and the first large-scale quantum internet will be built in Delft. However, the technology is still in an early phase. In this phase it is extremely important to focus on talent. QuTech Academy plays a key role in attracting and educating top talent for our research activities and for the future quantum technology sector.
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/
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...
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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...
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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...
Recap: Machine Learning for Semiconductor Quantum Devices
Переглядів 1448 місяців тому
Recap: Machine Learning for Semiconductor Quantum Devices
Quantum Control Stack for Spin Qubits
Переглядів 3578 місяців тому
Quantum Control Stack for Spin Qubits
Analyse CS diagrams with unsupervised NNs
Переглядів 718 місяців тому
Analyse CS diagrams with unsupervised NNs
So cool!
👍👍👍👍👍❤❤❤❤❤
Thank you
A little too fast on the explanation
I love to come on board
I look forward for this scholarship
Best explanation. Could you please do a video on difference PVM and POVM?
Absolutely fantastic. Thank you.
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.
What a great video <3
Is wave function a vector?
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.
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.
What is happening with the slide at 4:38 V=phi and the & sign on top of each other, clearly some kind of error
Amazing, I am speechless how intuitive you made it. Thanks
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 😅.
Did not explain anyons
Thanks for your video
“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.
This is the simplest explanation I've seen of something useful that you can do with a quantum computer...
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).
around 1:40 you are referring to a row vector as a column vector and verse visa.
3:34. Believe I would just settle on syncing clocks.
If an odd number wasn’t there from factoring and all then trees couldn’t be explained, rught
Way to quantum
Excelente recomendación tienes con el ING Jose Alfonso Hernando. El Maestro de maestros Valdeande Magico ... Saludos
Animo Pablo, los BEazcus bajando al mundo cuántico😂
Thank you for explaining this concept so clearly and easily! Very helpful <3
For M_i where does the factor 1/2 come from? The eigenvector is just (1, i) right?
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
Lol what kind of definition is that: coherence is the absence of decoherence. I think a discussion of phase would be helpful here.
Logic; ‘not’ gates
I would mark this video more as marketing rather than explanatory. Machinery probably very interesting.
Said a whole lot of nothing
What’s the catch of Germanium?
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
This is really amazing! Why don't more people know about it.
video which suits me the best for understanding Deutsch Jozsa!
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...
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?
Good
So nice
This may be the lamest possible use for quantum computers. Don’t they have any recipes for mayonaise?
This is the best explanation I've found. Thank you so much!!!
very very very useful, I finally get how we measure quantum states. Thank you, handsome pal
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. 🙂
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 😅
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!
bisa kah anda menunjukkan alat nyatanya
Without any objective background material the series feels like propaganda. By the way, I would have started this series with the double-slit experiment.
@ 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 ;-)
But at the moment the execution of this algorithm takes so much time that during processing the state decoheres and the results are useless.