34 citations · 59 across the 12 of their papers we have counts for
15 papers
Instability of Markov chains under infinitesimal coherent dissipation
Amir-Reza Negari, Yijian Zou, Timothy H. Hsieh
Under local Lindbladian evolution, the growth of conditional mutual information and its associated Markov length scale is not limited by Lieb-Robinson bounds, yet it has been uncle…
A Unified Framework for Locally Stable Phases
Zhi Li, Raz Firanko, Timothy H. Hsieh
We propose a unifying framework for characterizing pure and mixed state phases of matter across equilibrium, non equilibrium, and metastable regimes. We introduce the concept of lo…
Unlearnable phases of matter
Tarun Advaith Kumar, Yijian Zou, Amir-Reza Negari +2
We identify fundamental limitations in machine learning by demonstrating that non-trivial mixed-state phases of matter are computationally hard to learn. Focusing on unsupervised l…
Critical non-equilibrium phases from noisy topological memories
Amir-Reza Negari, Subhayan Sahu, Jan Behrends +2
We demonstrate the existence of an extended non-equilibrium critical phase, characterized by sub-exponential decay of conditional mutual information (CMI), in the surface code subj…
Autoregressive Typical Thermal States
Tarun Advaith Kumar, Leon Balents, Timothy H. Hsieh +1
A variety of generative neural networks recently adopted from machine learning have provided promising strategies for studying quantum matter. In particular, the success of autoreg…
Mixed-state phases from local reversibility
Shengqi Sang, Leonardo A. Lessa, Roger S. K. Mong +3
We propose a refined definition of mixed-state phase equivalence based on locally reversible channel circuits. We show that such circuits preserve topological degeneracy and the lo…
Probing mixed-state phases on a quantum computer via Renyi correlators and variational decoding
Yuxuan Zhang, Timothy H. Hsieh, Yong Baek Kim +1
Recent advances have defined nontrivial phases of matter in open quantum systems, such as many-body quantum states subject to environmental noise. In this work, we experimentally p…
Higher-form anomaly and long-range entanglement of mixed states
Leonardo A. Lessa, Shengqi Sang, Tsung-Cheng Lu +2
In open quantum systems, we directly relate anomalies of higher-form symmetries to the long-range entanglement of any mixed state with such symmetries. First, we define equivalence…
Universal Properties of Critical Mixed States from Measurement and Feedback
Zhehao Zhang, Yijian Zou, Timothy H. Hsieh +1
We explore the universal properties of mixed quantum matter obtained from "single-shot" adaptive evolution, in which a quantum-critical ground-state is manipulated through a single…
Spacetime Markov length: a diagnostic for fault tolerance via mixed-state phases
Amir-Reza Negari, Tyler D. Ellison, Timothy H. Hsieh
We establish a correspondence between the fault-tolerance of local stabilizer codes experiencing measurement and physical errors and the mixed-state phases of decohered resource st…
Approximate quantum error correcting codes from conformal field theory
Shengqi Sang, Timothy H. Hsieh, Yijian Zou
The low-energy subspace of a conformal field theory (CFT) can serve as a quantum error correcting code, with important consequences in holography and quantum gravity. We consider g…
Symmetry enforced entanglement in maximally mixed states
Amin Moharramipour, Leonardo A. Lessa, Chong Wang +2
Entanglement in quantum many-body systems is typically fragile to interactions with the environment. Generic unital quantum channels, for example, have the maximally mixed state wi…
Stability of mixed-state quantum phases via finite Markov length
Shengqi Sang, Timothy H. Hsieh
For quantum phases of Hamiltonian ground states, the energy gap plays a central role in ensuring the stability of the phase as long as the gap remains finite. We propose Markov len…
Mixed-state Quantum Phases: Renormalization and Quantum Error Correction
Shengqi Sang, Yijian Zou, Timothy H. Hsieh
Open system quantum dynamics can generate a variety of long-range entangled mixed states, yet it has been unclear in what sense they constitute phases of matter. To establish that…
Generation of Thermofield Double States and Critical Ground States with a Quantum Computer
D. Zhu, S. Johri, N. M. Linke +6
Finite-temperature phases of many-body quantum systems are fundamental to phenomena ranging from condensed-matter physics to cosmology, yet they are generally difficult to simulate…