Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session T53: Exotic Qubits and Quantum Memories
11:30 AM–1:42 PM,
Thursday, March 7, 2024
Room: 202AB
Sponsoring
Units:
DQI DCMP
Chair: Patrick Winkel, Yale University
Abstract: T53.00001 : Decohered Symmetry-Protected Topological States as a Resource for Quantum Communication
11:30 AM–11:42 AM
Presenter:
Zhehao Zhang
(University of California, Santa Barbara)
Authors:
Zhehao Zhang
(University of California, Santa Barbara)
Utkarsh Agrawal
(Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA, 93106)
Sagar Vijay
(University of California, Santa Barbara)
Collaborations:
Zhehao Zhang, Utkarsh Agrawal, Sagar Vijay
nosed by measures of correlations in multiple copies of the decohered state. Here, we argue that
some of these measures, such as the “strange correlator” in decohered symmetry protected topo-
logical (SPT) states are directly related to the ability to use the decohered state as a resource for
the coherent transfer of classical or quantum information. Specifically, we study the behavior of the
coherent information Ic, when a pure SPT state interacts with an external environment. A rich
phase diagram emerges depending on whether one can transfer quantum or classical information
using the resulting mixed state (i) with or (ii) without access to the external environment E, which
we study extensively.
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