April 2021 - ITP-quantumseminare

Today 4pm: How to join a bootcamp for quantum startups and build a company from your research ideas
by Lidia del Rio 30 Apr '21

30 Apr '21

Dear all, We have this talk on quantum startup bootcamps today at 4pm! https://ethz.zoom.us/j/68223543732 <https://ethz.zoom.us/j/68223543732> Best, Lídia Quantum Futures is a seminar series organized by the ETH Zurich Quantum Center, with a focus on careers in quantum technologies. We talk to academics, startups, established companies and quantum research centers around the world to bring you career advice and news of job opportunities. If you missed it, you can watch the first edition (an interview with professors Yiwen Chu and Renato Renner) on ourYouTube channel <https://www.youtube.com/channel/UCJa7n2dv7ZtdG--Ki-oMNHw>. *Coming up on the 30th of April: a bootcamp for quantum startups!* Would you like to venture into the world of startups? Perhaps you have a research idea that could be turned into a company, or maybe you'd just like to meet like-minded researchers and students and join them in such a project? There are now startup incubators dedicated to quantum technologies! The Quantum Center welcomes Sam Kearney and Sean Oh for a presentation of the Quantum Stream of the Creative Destruction Labs in Toronto. The CDL is a non-profit organization that hosts a series of year-long programs to train founders and connect them to mentors in industry and academia, with the goal of forming companies to explore ideas in quantum technologies and computing. Applications are now open for the next batch of the bootcamp (deadline 23rd of May), and in this seminar we will learn how the program works and how to apply. Two key aspects are that the program is free for founders, and that you don't need a concrete idea to apply. You can consult theCDL Quantum Stream Summary <https://sgnldrp.online/click?redirect=https%3A%2F%2Fdrive.google.com%2Ffile…>, theList of mentors in the Quantum Program <https://sgnldrp.online/click?redirect=https%3A%2F%2Fwww.creativedestruction…>and the List of CDL Quantum alumni <https://sgnldrp.online/click?redirect=https%3A%2F%2Fwww.creativedestruction…>. *When:*Friday, 30th of April, 4pm *Duration:*45min *Where:*Zoom (https://ethz.zoom.us/j/68223543732 <https://ethz.zoom.us/j/68223543732>) and YouTube (https://www.youtube.com/channel/UCJa7n2dv7ZtdG--Ki-oMNHw <https://www.youtube.com/channel/UCJa7n2dv7ZtdG--Ki-oMNHw>). The recording will be available on YouTube after the seminar. *Audience:*students and researchers in quantum science and technologies /What is the Quantum Center?/ The freshly launchedQuantum Center <http://www.qc.ethz.ch/>is a network of 28 research groups from ETH Zurich and PSI. The center coordinates the various scientific and structural activities in quantum science and technology at ETH Zurich. In particular, it interconnects research and teaching across ETH departments and further strengthens current activities by leveraging the broad competencies available at ETH Zurich. You can follow us on Twitter @ETHQuantumCntr and sign up to theQuantum Center Newsletter <https://qc.ethz.ch/news-events/mailing-list.html>to stay in touch and learn about upcoming activities.

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Tuesday's QIT Seminar
by Joe Renes 26 Apr '21

26 Apr '21

Hi all, Tomorrow Florian Meier will tell us about his semester project with Lídia, entitled "Online Erasure in Quantum Computers: Hidden Subgroup Problem with Partial Information". See below for the abstract. We start at 2pm on zoom: https://ethz.zoom.us/j/362994444. Best, Joe Abstract: Both finite memory and heat generation are problems for experimental realizations of quantum computers. A naïve erasure of a quantum memory costs work and dissipates heat into the quantum computer's environment due to Landauer's principle. We propose a protocol for erasing qubits on the go, in the middle of a quantum algorithm, hence the name online erasure. We define this protocol for instances of quantum algorithms solving the hidden subgroup problem. Making use of the entanglement between the ancillary register and the main register the online erasure procedure can be used to absorb heat from the environment, thus cooling the quantum computer on the go, while still solving the hidden subgroup problem. If we are looking at a hidden subgroup H of a group G the work cost of erasure can be negative and is lower bounded by -kT ln|G/H|. Moreover, we investigate whether the existence of an online erasure protocol implies that the quantum algorithm could have been simplified in the first place, in the sense that it could run on fewer qubits. Quantitatively, if we have open circuit access to the function oracle, an online erasure protocol erasing k ancilla qubits can be repurposed to reduce the number of main and ancilla qubits each by k.

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Tomorrow's QIT Seminar
by Joe Renes 19 Apr '21

19 Apr '21

Hi all, Tomorrow Sven Jandura will tell us about his master thesis with Ernest, entitled "De Finetti Theorems for Quantum Conditional Probability Distributions with Symmetry". See below for the abstract. We start at 2pm on zoom: https://ethz.zoom.us/j/362994444. Best, Joe Abstract: In device independent quantum key distribution (DIQKD) Alice and Bob try to establish a shared secret key without trusting the devices used in key generation. The setup must therefore be treated as a black box and is mathematically described by a conditional probability distribution. Security proofs of DIQKD protocols can be simplified if the attacker can be restricted to attack each round in the key distribution process in an identical fashion (collective attacks). For many protocols such a reduction is available through the entropy accumulation theorem (EAT), but there are interesting protocols where the EAT is not applicable. In this presentation we introduce two de Finetti theorems that relate the properties of an arbitrary Clauser-Horne-Shimony-Holt (CHSH) symmetric quantum black box to a convex combination of iid quantum black boxes (de Finetti boxes). We further discuss how these theorems could be used in DIQKD security proofs, even if the EAT is not applicable, to impose restrictions on the attacker.

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Fwd: Quantum Day interview-talk with Yiwen Chu and Renato Renner
by Lidia del Rio 14 Apr '21

14 Apr '21

Dear all, Happy World Quantum Day! Join us today for a lunch interview with Renato and Yiwen Chu at 12:00. Best, Lídia ——————————————————————————————————————————————————— > > Dear all, > April 14th is*World Quantum Day*! On the occasion of the launch of > this initiative, the Quantum Center, ETH Zurich invites you, your > family and friends to an online interview with Professors*Yiwen Chu > and Renato Renner*, moderated by Chiara Decaroli. We will talk about > what does it mean to be a Quantum Scientist, what is Quantum Science > and what kinds of research are carried out by Quantum Center members. > Join us on*April 14th, 2021 at 12:00*Zurich time at the following zoom > link:https://ethz.zoom.us/j/68223543732 > <https://ethz.zoom.us/j/68223543732> > ——————————————————————————————————————————— > /What is the World Quantum Day?/ > // > The World Quantum Day is a new decentralised outreach initiative to > promote the public understanding of quantum science and technology. We > invite all quantum scientists, engineers, educators, communicators > andentrepreneursto promote their own activities, such as outreach > talks, lab tours, debates, lectures or interviews at a global scale. > This year we celebrate the first World Quantum Day, on the 14th of > April. Find out more and register your own events > athttps://worldquantumday.org <https://worldquantumday.org/> > /What is the Quantum Center, ETH Zurich?/ > // > The freshly launchedQuantum Center <http://www.qc.ethz.ch/>is a > network of 28 research groups from ETH Zurich and PSI. The Center > coordinates the various scientific and structural activities in > quantum science and technology at ETH Zurich. In particular, it > interconnects research and teaching across ETH departments and further > strengthens current activities by leveraging the broad competencies > available at ETH Zurich. You can follow us on Twitter: @ETHQuantumCntr > and sign up to theQuantum Center Newsletter > <https://qc.ethz.ch/news-events/mailing-list.html>to stay in touch and > learn about upcoming activities. > Best regards, > Chiara Decaroli, Lidia del Rio & Francesca Bay

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Tomorrow's QIT Seminar
by Joe Renes 12 Apr '21

12 Apr '21

Hi all, Tomorrow Ladina Hausmann will tell us about her master thesis, entitled ''Axiomatic Black Hole Thermodynamics''. See below for the abstract. We start at 2pm in zoom: https://ethz.zoom.us/j/362994444. Best, Joe Abstract: In order to establish under which conditions specific results from black hole thermodynamics hold, it is important to know which assumptions were made on the thermodynamic theory. This can be accomplished through the use of a rigorous phenomenological axiomatic framework, such at that proposed by Kammerlander [1]. However, existing frameworks only consider energy as a conserved quantity. This means that the applicability of these frameworks to systems which have multiple conserved quantities is limited. As black holes have internal angular momentum and charge, this limitation also extends to them. In this work, we address this by extending Kammerlander's framework to describe multiple conserved quantities. To do so, we first consider microscopic thermodynamics to extend Kammerlander's framework and then to verify our generalisations. Next, we apply our extended framework to black holes, and we successfully confirm all previously established results which we took under consideration. [1] Philipp Kammerlander. Tangible Phenomenological Thermodynamics. PhD thesis, ETH Zurich, 2019

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tomorrow's QIT Seminar
by Joe Renes 05 Apr '21

05 Apr '21

Hi all, Tomorrow Julia Karlen will tell us about her semester project with Jinzhao, entitled "Entropy and entanglement wedge reconstruction in holography". See below for the abstract. We start at 2pm on zoom: https://ethz.zoom.us/j/362994444. Best, Joe Abstract: Holography states that gravitational physics in the bulk can be equivalently described as an ordinary quantum theory on its boundary. We review some recent developments of the AdS/CFT correspondence in the semiclassical limit. We take a closer look at the derivation of the holographic entanglement entropies, using the gravitational replica method. With the cosmic brane prescription, we can deduce, that the refined Rényi entropy has an area law such as the Ryu-Takayanagi (RT) formula for the von Neumann entropy. A black hole in Jackiw–Teitelboim (JT) gravity is examined to elaborate the RT formula. AdS/CFT bears some mysterious features, which hint at a quantum error correction viewpoint, where the bulk information can be redundantly encoded into the boundary using error correcting codes. >From this perspective, the equivalence of the RT formula, entanglement wedge reconstruction and the matching of the relative entropies in bulk and boundary can be demonstrated. Within the framework of universal recovery channels, exact and approximate entanglement wedge reconstruction are examined more carefully.

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