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Title: Mixeds-sourcery: Building many-body states using bubbles of nothing

Journal Article · · Physical Review. B
 [1];  [2]
  1. Stanford Univ., Palo Alto, CA (United States)
  2. Univ. of California San Diego, La Jolla, CA (United States)

We recently introduced the idea of s-sourcery [B. Swingle and J. McGreevy, Phys. Rev. B 93, 045127 (2016)], a general formalism for building many-body quantum ground states using renormalization-group-inspired quantum circuits. In this work, we define a generalized notion of s-sourcery that applies to mixed states and study its properties and applicability. For our examples we focus on thermal states of local Hamiltonians. We prove a number of theorems establishing the prevalence of mixed s-source fixed points, giving results for free fermion models, conformal field theories, holographic models, and topological phases. Thermal double states (also called thermofield double states) and the machinery of approximate conditional independence are used heavily in the constructions. For a large class of models we provide an information theoretic argument for the existence of a local Hamiltonian whose ground state is the thermal double state, and in some cases we construct such a Hamiltonian.

Research Organization:
Univ. of California, San Diego, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0009919
OSTI ID:
1535777
Alternate ID(s):
OSTI ID: 1329091
Journal Information:
Physical Review. B, Vol. 94, Issue 15; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (12)

On complexity of holographic flavors journal January 2018
Quantum Approximate Markov Chains are Thermal journal June 2019
Approximate reversal of quantum Gaussian dynamics journal February 2018
Locality of edge states and entanglement spectrum from strong subadditivity journal May 2019
Approximate Reversal of Quantum Gaussian Dynamics text January 2018
Locality of Edge States and Entanglement Spectrum from Strong Subadditivity text January 2018
Finite Correlation Length Implies Efficient Preparation of Quantum Thermal States journal May 2018
Bifurcating entanglement-renormalization group flows of fracton stabilizer models journal July 2020
Entanglement and thermalization in open fermion systems preprint January 2016
Recovery Map for Fermionic Gaussian Channels text January 2018
How to Build the Thermofield Double State text January 2018
Variational Thermal Quantum Simulation via Thermofield Double States text January 2018

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