Rushikesh Patil

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I will talk about two of my recent works that study critical phenomena in the presence of measurements, and where randomness in measurement outcomes plays a key role.

I will first discuss our recent work: https://arxiv.org/abs/2604.06324, where we discover a novel higher Nishimori line in the phase diagram of deformed toric codes and classical Ising models under measurements. I will talk about a number of exact results, like the power-law exponent of the Edwards-Anderson correlator at the tricritical point in the phase diagram, that follow from this higher Nishimori structure.

Then I will discuss another recent work: https://arxiv.org/abs/2507.07959, where we obtain a non-perturbative theorem that establishes monotonicity of the Casimir effective central charge under RG flows induced by measurements on 2D classical critical points. The existence of this 'c-effective theorem' despite the lack of translational invariance due to random measurement outcomes distinguishes it from previously known monotonicity theorems for RG flows.

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UC Santa Barbara
0.03
Contact: Simon Trebst