338 citations · 1.9k across the 43 of their papers we have counts for
44 papers
Independent density and coherence skin effects in adaptive fermion circuits
Karim Chahine, Markus Siegl, Michael Buchhold
Adaptive circuits use measurements and outcome-conditioned feedback to implement nonreciprocal dynamics without postselection. We show that fermion circuits host independently tuna…
Spectral Transitions of the Entanglement Hamiltonian in Monitored Free Fermions
Karim Chahine, Michael Buchhold
We numerically investigate measurement-induced phase transitions in monitored free fermions through the spectral and eigenstate properties of the entanglement Hamiltonian. By analy…
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…
Entanglement dynamics in monitored Kitaev circuits: loop models, symmetry classification, and quantum Lifshitz scaling
Kai Klocke, Daniel Simm, Guo-Yi Zhu +2
Quantum circuits offer a versatile platform for simulating digital quantum dynamics and uncovering novel states of non-equilibrium quantum matter. One principal example are measure…
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…
Robustness and measurement-induced percolation of the surface code
Thomas Botzung, Michael Buchhold, Sebastian Diehl +1
We examine the robustness of a logical qubit in the planar surface code subject to 'measurement-errors', i.e., to local Pauli measurements at known positions. This yields a measure…
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…
Entanglement phases, localization and multifractality of monitored free fermions in two dimensions
K. Chahine, M. Buchhold
We investigate the entanglement structure and wave function characteristics of continuously monitored free fermions with U-symmetry in two spatial dimensions (2D). By deriving…
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…
Revealing measurement-induced phase transitions by pre-selection
M. Buchhold, T. Müller, S. Diehl
Pushing forward the understanding of general non-unitary dynamics in controlled quantum platforms has been fueled by the recent discovery of measurement-induced phases and phase tr…
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…
Decoupling of static and dynamic criticality in a driven Mott insulator
A. de la Torre, K. L. Seyler, M. Buchhold +12
Dynamically driven interacting quantum many-body systems have the potential to exhibit properties that defy the laws of equilibrium statistical mechanics. A widely studied model is…
Localization crossover and subdiffusive transport in a classical facilitated network model of a disordered, interacting quantum spin chain
Kai Klocke, Christopher David White, Michael Buchhold
We consider the random-field Heisenberg model, a paradigmatic model for many-body localization (MBL), and add a Markovian dephasing bath coupled to the Anderson orbitals of the mod…
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…
Signatures of ultrafast reversal of excitonic order in TaNiSe
H. Ning, O. Mehio, M. Buchhold +4
In the presence of electron-phonon coupling, an excitonic insulator harbors two degenerate ground states described by an Ising-type order parameter. Starting from a microscopic Ham…
Hydrodynamic stabilization of self-organized criticality in a driven Rydberg gas
K. Klocke, T. M. Wintermantel, G. Lochead +2
Signatures of self-organized criticality (SOC) have recently been observed in an ultracold atomic gas under continuous laser excitation to strongly-interacting Rydberg states [S. H…
Epidemic growth and Griffiths effects on an emergent network of excited atoms
T. M. Wintermantel, M. Buchhold, S. Shevate +5
Whether it be physical, biological or social processes, complex systems exhibit dynamics that are exceedingly difficult to understand or predict from underlying principles. Here we…
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…
Quantum dynamics in strongly driven random dipolar magnets
M. Buchhold, C. S. Tang, D. M. Silevitch +2
The random dipolar magnet LiHoYF enters a strongly frustrated regime for small Ho concentrations with . In this regime, the magnetic moments of the H…