Abstract: Textbook quantum mechanics treats measurement as a mathematical projection. In
reality, measurement is a dynamical physical process subject to both fundamental constraints
(such as back-action and added noise) and technical bottlenecks (such as insertion loss and
circuit complexity). The interface where this process occurs--the boundary between the fragile
quantum system and the robust macroscopic world--currently limits the scalability and fidelity of
almost all quantum technologies.
In this talk, I present a framework for in-situ quantum signal processing in superconducting
circuits. I will demonstrate how we can address the interface challenge by replacing static
hardware--isolators, amplifiers, and splitters--with engineered time-dependent interactions
implemented directly on-chip. By parametrically driving multi-wave mixing processes, we
engineer effective Hamiltonians that break reciprocity and amplify signals at the source. This
architecture eliminates the need for bulky magnetic isolation, offering a scalable path toward
high-fidelity, directional readout in large-scale arrays.
Second, I will address the fundamental physics of analyzing these driven systems. Finite
measurement bandwidth implies that our observation is inherently incomplete; we effectively
"coarse-grain" over the system's fastest dynamics. To model this, I introduce a method that
derives effective generators for these time-averaged observables. I will show how it allows us to
capture the non-trivial effects of competing timescales in strongly driven systems, revealing
deterministic corrections that are essential for understanding the limits and prospects of driven
systems.

Short bio: Leon Bello received his PhD in Physics from Bar-Ilan University in 2021 under the
supervision of Prof. Avi Pe’er, with a focus on parametric processes for sensing and
computation. He subsequently held a postdoctoral position at Princeton University with Prof.
Hakan Türeci, where he worked on quantum device theory, quantum control, and computation
in engineered physical systems. He is currently a postdoctoral fellow at the Weizmann Institute
of Science.

Abstract: Black holes have large classical entropy. The nature of the underlying microstates remains a longstanding subject of interest. Among other expected properties, these microstates are expected to be chaotic. Recently, it has been conjectured that they are also `fortuitous’: they change erratically as one tunes the parameters of the theory.

In this talk (based on work in progress), we introduce a toy model for supersymmetric black hole microstates derived from string theory. We explain why this toy model exhibits many features expected for black holes and show that its ground states are indeed `fortuitous’. We also sketch an argument suggesting that they exhibit chaotic behaviour.