338 citations · 1.9k across the 43 of their papers we have counts for
15 papers · 1 filter
Monitored interacting Dirac fermions
Thomas Martin Müller, Michael Buchhold, Sebastian Diehl
We analytically study interacting Dirac fermions, described by the Thirring model, under weak local particle number measurements with monitoring rate . This system maps to a bos…
Power-law entanglement and Hilbert space fragmentation in non-reciprocal quantum circuits
Kai Klocke, Joel E. Moore, Michael Buchhold
Quantum circuits utilizing measurement to evolve a quantum wave function offer a new and rich playground to engineer unconventional entanglement dynamics. Here we introduce a hybri…
Universality in driven open quantum matter
Lukas M. Sieberer, Michael Buchhold, Jamir Marino +1
Universality is a powerful concept, which enables making qualitative and quantitative predictions in systems with extensively many degrees of freedom. It finds realizations in almo…
Field theory for the dynamics of the open model
Johannes Lang, Michael Buchhold, Sebastian Diehl
A field theory approach for the nonequilibrium relaxation dynamics in open systems at late times is developed. In the absence of conservation laws, all excitations are subject to d…
Majorana Loop Models for Measurement-Only Quantum Circuits
Kai Klocke, Michael Buchhold
Projective measurements in random quantum circuits lead to a rich breadth of entanglement phases and extend the realm of non-unitary quantum dynamics. Here we explore the connectio…
Topological order and entanglement dynamics in the measurement-only XZZX quantum code
Kai Klocke, Michael Buchhold
We examine the dynamics of a -dimensional measurement-only circuit defined by the stabilizers of the [[5,1,3]] quantum error correcting code interrupted by single-qubit Paul…
Monitored Open Fermion Dynamics: Exploring the Interplay of Measurement, Decoherence, and Free Hamiltonian Evolution
B. Ladewig, S. Diehl, M. Buchhold
The interplay of unitary evolution and local measurements in many-body systems gives rise to a stochastic state evolution and to measurement-induced phase transitions in the pure s…
Continuous Gaussian Measurements of the Free Boson CFT: A model for Exactly Solvable and Detectable Measurement-Induced Dynamics
Y. Minoguchi, P. Rabl, M. Buchhold
Hybrid evolution protocols, composed of unitary dynamics and repeated, weak or projective measurements, give rise to new, intriguing quantum phenomena, including entanglement phase…
Measurement-induced dark state phase transitions in long-ranged fermion systems
Thomas Müller, Sebastian Diehl, Michael Buchhold
We identify an unconventional algebraic scaling phase in the quantum dynamics of free fermions with long range hopping, which are exposed to continuous local density measurements.…
A learning algorithm with emergent scaling behavior for classifying phase transitions
Nishad Maskara, Michael Buchhold, Manuel Endres +1
Machine learning-inspired techniques have emerged as a new paradigm for analysis of phase transitions in quantum matter. In this work, we introduce a supervised learning algorithm…
Effective Theory for the Measurement-Induced Phase Transition of Dirac Fermions
M. Buchhold, Y. Minoguchi, A. Altland +1
A wave function exposed to measurements undergoes pure state dynamics, with deterministic unitary and probabilistic measurement induced state updates, defining a quantum trajectory…
Entanglement transition in a monitored free fermion chain -- from extended criticality to area law
Ori Alberton, Michael Buchhold, Sebastian Diehl
We analyze the quantum trajectory dynamics of free fermions subject to continuous monitoring. For weak monitoring, we identify a novel dynamical regime of subextensive entanglement…
Phenomenology of a First Order Dark State Phase Transition
Dietrich Roscher, Sebastian Diehl, Michael Buchhold
Dark states are stationary states of a dissipative, Lindblad-type time evolution with zero von Neumann entropy, therefore representing examples of pure, steady quantum states. Non-…
Background Field Functional Renormalization Group for Absorbing State Phase Transitions
Michael Buchhold, Sebastian Diehl
We present a functional renormalization group approach for the active to inactive phase transition in directed percolation type systems, in which the transition is approached from…
Absorbing state phase transition with competing quantum and classical fluctuations
M. Marcuzzi, M. Buchhold, S. Diehl +1
Stochastic processes with absorbing states feature remarkable examples of non-equilibrium universal phenomena. While a broad understanding has been progressively established in the…