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Quantum Information at ULB (@QuantInfoULB) profile picture

Quantum Information at ULB

@QuantInfoULB

Twitter page of Center for Quantum Information and Communication (https://teapawt.net/t.co/qkUmOuxr13) & Laboratoire d'Information Quantique (https://teapawt.net/t.co/r2vVZDk7t7) at @ULBruxelles

 Brussels, Belgium
Joined May 2020
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  • Followers123
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Photo by Quantum Information at ULB (@QuantInfoULB)Photo by Quantum Information at ULB (@QuantInfoULB)
Quantum speed limits for information and coherence doi.org/10.1088/1367-2630/ac… w/ Brij Mohan & Arun K Pati We determine speed limits on informational measures, namely von Neumann entropy, maximal information, & coherence of quantum systems evolving under dynamical processes.
Image from Siddhartha| सिद्धार्थ| సిద్ధార్థ (@das_seed)
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Fundamental limitations on the device-independent #quantum conference key agreement journals.aps.org/pra/abstrac… w/ Karol Horodecki & Marek Winczewski. We provide bounds on the optimal rate at which trusted users can distill conference key against quantum adversary.
Image from Siddhartha| सिद्धार्थ| సిద్ధార్థ (@das_seed)
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New preprint “Entanglement in prepare-and-measure scenarios: many questions, a few answers” from Jef Pauwels, Armin Tavakoli, Erik Woodhead and Stefano Pironio now on arXiv: arxiv.org/abs/2108.00442 #quantum
Image from Quantum Information at ULB (@QuantInfoULB)
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Our work gives quantum #thermodynamical meaning to the majorization relation on the set of nonincreasing vectors due to Hoffman. The prospect of this work is a general resource-theoretical framework for the extractable work via #quantum operations going beyond thermal operations
Image from Siddhartha| सिद्धार्थ| సిద్ధార్థ (@das_seed)
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Upper bounds on device-independent quantum key distribution (DI-QKD) rates in static and dynamic scenarios. arxiv.org/abs/2107.06411, w/ @Eneet1 and Karol Horodecki. #Quantum #Cryptography #DIQKD
Image from Siddhartha| सिद्धार्थ| సిద్ధార్థ (@das_seed)
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We introduce QPV protocols that are practically secure: they only require single-qubit states from each of the verifiers, yet their security is broken if adversaries sharing impractically large number of entangled qubits employ teleportation-based attacks doi.org/10.1088/1367-2630/ac…
Image from Siddhartha| सिद्धार्थ| సిద్ధార్థ (@das_seed)
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New paper published in Quantum: “Quantum advantage from energy measurements of many-body quantum systems” by Leonardo Novo, @queenofquanta and @RaulGarciaPatr1 quantum-journal.org/papers/q…
Quantum advantage from energy measurements of many-body quantum systems

Quantum advantage from energy measurements of many-body quantum systems

Leonardo Novo, Juani Bermejo-Vega, and Raúl García-Patrón, Quantum 5, 465 (2021). The problem of sampling outputs of quantum circuits has been proposed as a candidate for demonstrating a quantum...

quantum-journal.org
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New preprint "Correlations in entanglement-assisted prepare-and-measure scenarios" by Armin Tavakoli, Jef Pauwels, Erik Woodhead and Stefano Pironio now on arXiv (arxiv.org/abs/2103.10748). #quantum
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New press release by Ognyan Oreshkov at QUIC: “Quantum causal loops” (eurekalert.org/pub_releases/……) via @EurekAlert about joint work with Jonathan Barrett and Robin Lorenz from @OxfordQuantum, published this week in @NatureComms. #physics #quantum #quantuminformation #causality
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Partial order on passive states & Hoffman majorization in quantum thermodynamics: arxiv.org/abs/2012.11626 w/ @singhuttam & Nicolas Cerf. Our main goal in this work is to explore a theory of quantum thermodynamics in the absence of a thermal heat bath.
Image from Siddhartha| सिद्धार्थ| సిద్ధార్థ (@das_seed)
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Recent preprint by Leonardo Novo (QuIC, @ULBruxelles) & Sofia Ribeiro (@DurhamQlm) explores how Floquet engineering can be used in the continuous-time quantum walk framework to simulate graphs with increased connectivity and/or complex couplings. arxiv.org/abs/2012.00448
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Paper titled "Quantum Speedup for Graph Sparsification, Cut Approximation and Laplacian Solving", by Simon Apers (QuIC ULB, CWI & INRIA Paris) & Ronald de Wolf (QuSoft, CWI) will be presented at the 61st Annual IEEE Symposium on the Foundations of Computer Science (#FOCS2020).
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Link to the full paper: arxiv.org/abs/1911.07306 Link to the long talk: youtube.com/watch?v=NzBmydrO…
Quantum Information at ULB retweeted
Ravi Kunjwal (@quaintum) profile picture
Ravi Kunjwal@quaintum28 Oct 2020
Our paper on joint measurability structures realizable with qubit measurements is now published @PhysRevResearch journals.aps.org/prresearch/… #quantum #paper #measurement #incompatibility
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Paper titled "Finding a marked node on any graph via continuous-time quantum walks" by @shantanav_c, Leonardo Novo and Jérémie Roland has been published in @PhysRevA. journals.aps.org/pra/abstrac…

Finding a marked node on any graph via continuous-time quantum walks

Spatial search by a discrete-time quantum walk can find a marked node on any ergodic, reversible Markov chain $P$ quadratically faster than its classical counterpart, i.e., in a time that is in the...

journals.aps.org
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They provide a continuous-time quantum walk based algorithm that can find a marked vertex on any ergodic, reversible Markov chain quadratically faster than classical random walks.
Congratulations to Atul Singh Arora (@AtulSinghArora) for successfully defending his PhD thesis titled "Quantum Weak Coin Flipping"! He was supervised by Jérémie Roland. Atul will move to @IQIM_Caltech as a postdoctoral researcher.
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