Probing Defects with Quantum Simulator Snapshots

Abstract

Snapshots, i.e. projective measurements of local degrees of freedom, are the most standard data taken in experiments on quantum simulators. Snapshots are usually used to probe local physics. In this work we propose a simple protocol to experimentally probe physics of defects with these snapshots. Our protocol relies only on snapshots from the bulk system, without introducing the defect explicitly; as such, the physics of different kinds of defects can be probed using the same dataset. In particular, we demonstrate that with snapshots of local spin configurations of, for example, the $1d$ Rydberg atom realization of the quantum Ising criticality, we can (1) extract the ``defect entropy", and (2) access the continuous line of fixed points of effective defect conformal field theory, which was recently discussed in the context of the ``weak-measurement altered criticality".

5 pages plus supplemental material. v2: Added substantial discussion of sample complexity in supplemental material

References in corpus (36)

• Probing many-body dynamics on a 51-atom quantum simulator
• Generalized Global Symmetries
• Evolution of Entanglement Entropy in One-Dimensional Systems
• Probing Topological Spin Liquids on a Programmable Quantum Simulator
• Theory of the phase transition in random unitary circuits with measurements
• Measurement-induced criticality in random quantum circuits
• The Bootstrap Program for Boundary CFT_d
• Statistical mechanics of quantum error correcting codes
• Bootstrapping the 3d Ising twist defect
• Interference between independent fluctuating condensates
• Boundary and Interface CFTs from the Conformal Bootstrap
• Quantum criticality under decoherence or weak measurement
• Full quantum distribution of contrast in interference experiments between interacting one dimensional Bose liquids
• Defects in conformal field theory
• Localized magnetic field in the $O(N)$ model
• Measurements conspire nonlocally to restructure critical quantum states
• Boundary Criticality of the 3D O($N$) Model: From Normal to Extraordinary
• Irreversibility in quantum field theories with boundaries
• Universal Features of Higher-Form Symmetries at Phase Transitions
• Entanglement entropy in the Ising model with topological defects
• Entanglement in one-dimensional critical state after measurements
• Fermion disorder operator at Gross-Neveu and deconfined quantum criticalities
• Measurement-altered Ising quantum criticality
• Scaling of disorder operator at $(2+1)d$ U(1) quantum criticality
• Conformal fields and operator product expansion in critical quantum spin chains
• Probing sign structure using measurement-induced entanglement
• Channeling quantum criticality
• Microscopic characterization of Ising conformal field theory in Rydberg chains
• Entanglement entropy after a partial projective measurement in $1+1$ dimensional conformal field theories: exact results
• A plane defect in the 3d O$(N)$ model
• Phases of Wilson Lines in Conformal Field Theories
• The $g$-function and Defect Changing Operators from Wavefunction Overlap on a Fuzzy Sphere
• Visualizing Dynamics of Charges and Strings in (2+1)D Lattice Gauge Theories
• Disorder Operator and Rényi Entanglement Entropy of Symmetric Mass Generation
• Solving Conformal Defects in 3D Conformal Field Theory using Fuzzy Sphere Regularization
• Spin chain on a metallic surface: Dissipation-induced order vs. Kondo entanglement