Condensed matter physics is the branch of physics that studies systems of very large numbers of particles in a condensed state, like solids or liquids. Condensed matter physics wants to answer questions like: why is a material magnetic? Or why is it insulating or conducting? Or new, exciting questions like: what materials are good to make a reliable quantum computer? Can we describe gravity as the behavior of a material? The behavior of a system with many particles is very different from that of its individual particles. We say that the laws of many body physics are emergent or collective. Emergence explains the beauty of physics laws.
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Conference TalkDressed logical operators in mixed state quantum matter
Curt von Keyserlingk
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Circuit-based characterization of finite-temperature quantum phases
Shengqi Sang - Stanford University
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Measuring many observables from very few thermal states
Chi-Fang (Anthony) Chen
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Symmetry enforced entanglement in mixed states
Subhayan Sahu - Perimeter Institute for Theoretical Physics
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Unlearnable Phases of Matter
Yijian Zou - Perimeter Institute for Theoretical Physics
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Extensive Long-Range Magic in Non-Abelian Topological Orders
Sagar Vijay
I discuss how the low-energy states of non-Abelian topological orders possess extensive magic which is long-ranged, and cannot be eliminated by a constant-depth local unitary circuit. This refines conventional notions of complexity beyond the linear circuit depth which is required to prepare any… -
Decohered Gibbs states
Sarang Gopalakrishnan
I will discuss the mixed-state phase diagrams of decohered Gibbs states. I will argue, in particular, that commuting Gibbs states at nonzero temperature lie in the interior of mixed-state phases. -
Conference TalkDressed logical operators in mixed state quantum matter
Curt von Keyserlingk
We describe how to construct emergent strong higher-form symmetries in mixed quantum states that act unitarily on Hilbert space. Our construction uses (quasi-)local recovery channels from quantum error correction to some nearby simple (stabilizer or more general commuting projector) model. We prove… -
Circuit-based characterization of finite-temperature quantum phases
Shengqi Sang - Stanford University
Quantum phases at zero temperature can be defined as equivalence classes under local unitary transformations: two ground states are in the same phase if they can be transformed into each other via a local unitary circuit. In this talk, I will discuss how to generalize this circuit-based… -
Measuring many observables from very few thermal states
Chi-Fang (Anthony) Chen
We present a general protocol for efficiently estimating M observables from only log(M) copies of a Gibbs state, given access to its Hamiltonian. -
Quantum Industry Networking Event
Are you thinking about transitioning to Industry? Join the Quantum Industry Networking Event to hear from speakers who have transitioned from academia to quantum industry and participate in the speed networking session following their talks. **Confirmed guests include:** Aggie Branczyk – Quantum… -
Symmetry enforced entanglement in mixed states
Subhayan Sahu - Perimeter Institute for Theoretical Physics
Entanglement in quantum many-body systems is typically fragile to interactions with the environment. Strongly symmetric interactions, i.e. those that preserve a system's symmetry, however, can enforce non-trivial quantum entanglement patterns. We show that the highly mixed steady states of strongly… -
Unlearnable Phases of Matter
Yijian Zou - Perimeter Institute for Theoretical Physics
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 learning of distributions, we show that autoregressive neural networks fail to learn global properties of distributions… -
Efficient quantum algorithms for preparing many-body ground and Gibbs states (Virtual)
Dmitry Abanin
Preparation of quantum ground and thermal states of many-body systems is a key computational challenge for quantum simulation, with applications in physics, chemistry, and classical optimization. We will describe simple and efficient algorithms for ground and thermal state preparation, combining… -
Emergent Gauge Theories and Universal Codes in Analog and Digital Quantum Platforms
Ruben Verresen
I will discuss some recent experimental collaborations probing the onset of deconfined gauge theories by controlling individual atoms: (i) U(1) quantum spin liquids arising from non-equilibrium dynamics in neutral atom arrays (https://arxiv.org/abs/2602.18555) and (ii) non-abelian S3 topological… -
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Exact Matrix Product State for Model States in ideal Bands
Many-body interacting systems cannot generally be treated with analytical tools alone, making numerical methods essential for studying strongly correlated phases. In fractional quantum Hall systems, conformal field theory correlators provide a way to construct exact matrix product state…