156 citations · 528 across the 16 of their papers we have counts for
7 papers · 1 filter
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…
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…