CQI seminar: Maristella Crotti
by William Schober
Dear friends,
Tomorrow at 11:00 in D5.01 we'll have a guest speaker, Maristella Crotti from l'Università degli studi dell'Insubria, who will tell us about quantum channels and quantum batteries. Title and abstract below.
Warm regards,
Will Schober
Speaker:
Maristella Crotti
Title:
From quantum channels to quantum batteries
Abstract:
In this presentation, I will provide an overview of my academic path in physics, from my Bachelor’s to my current Master’s studies at the University of Insubria. I will begin with my Bachelor’s thesis, in which I carried out a small original research project exploring the transmission of classical information using non-orthogonal quantum states encoded in optical coherent states. I will then present my current Master’s thesis, which investigates the open-system dynamics of micromaser-based quantum batteries, with a focus on dissipation and stabilization.
2 months, 1 week
CQI seminar: Chen-Da Liu-Zhang
by William Schober
Dear friends,
Thursday at 11:00 in D0.03 we'll welcome another guest speaker, Chen-Da Liu-Zhang, who will give a talk on distributed cryptography. Title and abstract below.
Best regards,
Will Schober
Speaker: Chen-Da Liu-Zhang
Title: Distributed Cryptography with Dynamic Committees
Abstract:
Protocols with dynamic committees have emerged over the past decade to enable scalable distributed computation while remaining secure against adaptive denial-of-service (DoS) attacks, with Bitcoin and Algorand among the most notable examples.
This talk will cover recent advances in distributed cryptography with dynamic committees, including a unified framework for designing such protocols and new approaches to consensus and secure computation in this setting. The presentation will draw on results from recent papers published at PODC 2021, Eurocrypt 2022 and 2025, Crypto 2023, TCC 2024 and Financial Cryptography 2024.
2 months, 2 weeks
CQI seminar: Razeen ud Din
by William Schober
Dear friends,
Tomorrow at 2:30 in D5.01 we'll have a guest speaker, Razeen ud Din from IBA Karachi, speaking to us about nonlocality distillation. Title and abstract below.
Best regards,
Will Schober
Speaker: Razeen ud Din
Title: Nonlocality distillation can outperform entanglement distillation
Abstract: Given few copies n, of a noisy entangled bipartite state, we compare the optimal entanglement and nonlocality distillation protocols in terms of the attained CHSH violation. For n = 3, we find that nonlocality distillation can slightly outperform entanglement distillation for a high enough noise. We ask the question: Do there exist information processing tasks where this distinction implies a better protocol?
Time: Tuesday 13th May, 2:30 pm Lugano time (5:30 pm Karachi time)
Time: May 13, 2025 05:30 PM Islamabad, Karachi, Tashkent
Join Zoom Meeting
https://zoom.us/j/6392486842?omn=91454567364C
Meeting ID: 639 248 6842
2 months, 2 weeks
CQI Seminar: Matteo D'Anna
by William Schober
Dear friends,
This Wednesday, May 7th at 11:30-12:30 in D1.14, we're happy to welcome back Matteo D'Anna to give another talk, this time about simulation of 2D systems. Title and abstract below. Join us in person or online at https://meet.jit.si/CQISeminarTalks
Warm regards,
Will
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Title: Circuit compression for 2D quantum dynamics
Abstract: Deterministic methods for implementing the dynamics of quantum systems with quantum computers often suffer between a tradeoff between depth and accuracy. Variational approaches aim at offering accurate implementations at lower depths, at the expenses of needing to perform an optimization of the parametrized ansatz beforehand. In this I will present a novel method, taking advantage of out-of-distribution results to perform the optimization by employing only product states. By usisng a Pauli-propagation algorithm the method is able to estimate the target cost function for systems of, in principle, arbitrary topology, including 2D systems. The method allows to obtain implementations of the dynamics of large 2D systems (up to square lattices with 30 x 30 sites) that is orders of magnitude more accurate than standard trotterization, at identical depth. It is even possible to run the compiled ansatz on the H1 quantum chip and find that it can follow the dynamics with high accuracy. The method shows that compilation for large 2D systems is possible, and opens up the exploration to a plethora of applications both in theory and applications, as many families of ansaetze and connectivities can now be studied.
2 months, 3 weeks