156 citations · 528 across the 16 of their papers we have counts for
16 papers
Information dynamics in decohered quantum memory with repeated syndrome measurements: a dual approach
Jacob Hauser, Yimu Bao, Shengqi Sang +3
Measurements can detect errors in a decohered quantum memory allowing active error correction to increase the memory time. Previous understanding of this mechanism has focused on e…
Quantum Communication and Mixed-State Order in Decohered Symmetry-Protected Topological States
Zhehao Zhang, Utkarsh Agrawal, Sagar Vijay
Certain pure-state symmetry-protected topological orders (SPT) can be used as a resource for transmitting quantum information. Here, we investigate the ability to transmit quantum…
Observing quantum measurement collapse as a learnability phase transition
Utkarsh Agrawal, Javier Lopez-Piqueres, Romain Vasseur +2
The mechanism by which an effective macroscopic description of quantum measurement in terms of discrete, probabilistic collapse events emerges from the reversible microscopic dynam…
Critical phase and spin sharpening in SU(2)-symmetric monitored quantum circuits
Shayan Majidy, Utkarsh Agrawal, Sarang Gopalakrishnan +3
Monitored quantum circuits exhibit entanglement transitions at certain measurement rates. Such a transition separates phases characterized by how much information an observer can l…
Quantum Coding Transitions in the Presence of Boundary Dissipation
Izabella Lovas, Utkarsh Agrawal, Sagar Vijay
We investigate phase transitions in the encoding of quantum information in a quantum many-body system due to the competing effects of unitary scrambling and boundary dissipation. S…
Transitions in the learnability of global charges from local measurements
Fergus Barratt, Utkarsh Agrawal, Andrew C. Potter +2
We consider monitored quantum systems with a global conserved charge, and ask how efficiently an observer ("eavesdropper") can learn the global charge of such systems from local pr…
A note on the quasiperiodic many-body localization transition in dimension
Utkarsh Agrawal, Romain Vasseur, Sarang Gopalakrishnan
The nature of the many-body localization (MBL) transition and even the existence of the MBL phase in random many-body quantum systems have been actively debated in recent years. In…
Field theory of charge sharpening in symmetric monitored quantum circuits
Fergus Barratt, Utkarsh Agrawal, Sarang Gopalakrishnan +3
Monitored quantum circuits (MRCs) exhibit a measurement-induced phase transition between area-law and volume-law entanglement scaling. MRCs with a conserved charge additionally exh…
Central Values of Degree Six L-functions: The Case of Hilbert Modular Forms
Utkarsh Agrawal
In this paper we give a formula for the central value of the completed -function , where and are Hilbert newforms, by explicitly computing the lo…
Entanglement and charge-sharpening transitions in U(1) symmetric monitored quantum circuits
Utkarsh Agrawal, Aidan Zabalo, Kun Chen +5
Monitored quantum circuits can exhibit an entanglement transition as a function of the rate of measurements, stemming from the competition between scrambling unitary dynamics and d…
A Note on the Stochastic Ruler Method for Discrete Simulation Optimization
Varun Ramamohan, Utkarsh Agrawal, Mohit Goyal
In this paper, we propose a relaxation to the stochastic ruler method originally described by Yan and Mukai in 1992 for asymptotically determining the global optima of discrete sim…
Quantum criticality in the 2d quasiperiodic Potts model
Utkarsh Agrawal, Sarang Gopalakrishnan, Romain Vasseur
Quantum critical points in quasiperiodic magnets can realize new universality classes, with critical properties distinct from those of clean or disordered systems. Here, we study q…
Anomalous low-frequency conductivity in easy-plane XXZ spin chains
Utkarsh Agrawal, Sarang Gopalakrishnan, Romain Vasseur +1
In the easy-plane regime of XXZ spin chains, spin transport is ballistic, with a Drude weight that has a discontinuous fractal dependence on the value of the anisotropy $Δ= \cos πλ…
Universality and Quantum Criticality in Quasiperiodic Spin Chains
Utkarsh Agrawal, Sarang Gopalakrishnan, Romain Vasseur
Quasiperiodic systems are aperiodic but deterministic, so their critical behavior differs from that of clean systems as well as disordered ones. Quasiperiodic criticality was previ…
Generalized hydrodynamics, quasiparticle diffusion, and anomalous local relaxation in random integrable spin chains
Utkarsh Agrawal, Sarang Gopalakrishnan, Romain Vasseur
We study the nonequilibrium dynamics of random spin chains that remain integrable (i.e., solvable via Bethe ansatz): because of correlations in the disorder, these systems escape l…
Noninteger-spin magnonic excitations in untextured magnets
Akashdeep Kamra, Utkarsh Agrawal, Wolfgang Belzig
Interactions are responsible for intriguing physics, e.g. emergence of exotic ground states and excitations, in a wide range of systems. Here we theoretically demonstrate that dipo…