Entanglement enhanced metrology with quantum many-body scars

• URL: http://arxiv.org/abs/2207.13521v1
• Date: Wed, 27 Jul 2022 13:47:21 GMT
• Title: Entanglement enhanced metrology with quantum many-body scars
• Authors: Shane Dooley, Silvia Pappalardi, John Goold
• Abstract summary: We show how systems containing quantum many-body scars can be used to generate stable multipartite entanglement. We describe how to exploit this structure for phase estimation with a precision that beats the standard quantum limit.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Although entanglement is a key resource for quantum-enhanced metrology, not all entanglement is useful. For example in the process of many-body thermalisation, bipartite entanglement grows rapidly, naturally saturating to a volume law. This type of entanglement generation is ubiquitous in nature but has no known application in most quantum technologies. The generation, stabilisation and exploitation of genuine multipartite entanglement, on the other hand, is far more elusive yet highly desirable for metrological applications. Recently it has been shown that quantum many-body scars can have extensive multipartite entanglement. However the accessibility of this structure for real application has been so far unclear. In this work, we show how systems containing quantum many-body scars can be used to dynamically generate stable multipartite entanglement, and describe how to exploit this structure for phase estimation with a precision that beats the standard quantum limit. Key to this is a physically motivated modification of a Hamiltonian that generates a variety of multipartite entangled states through the dynamics in the scar subspace.

Related papers

• Phase-controlled robust tripartite quantum entanglement in cavity-magnon optomechanics [8.007796307125288]
  We generate and manipulate tripartite entangled state of photons, phonons, and magnons within a hybrid cavity magnomechanical system. Our findings open up a promising way to manipulate and protect fragile tripartite entanglement.
  arXiv  Detail & Related papers  (2025-01-30T09:19:00Z)
• Shallow quantum circuits are robust hunters for quantum many-body scars [0.0]
  We show that a shallow variational eigensolver can be trained to successfully target quantum many-body scar states. Scars are area-law high-energy eigenstates of quantum many-body Hamiltonians, which are sporadic and immersed in a sea of volume-law eigenstates.
  arXiv  Detail & Related papers  (2024-01-17T15:32:57Z)
• Dipolar quantum solids emerging in a Hubbard quantum simulator [45.82143101967126]
  Long-range and anisotropic interactions promote rich spatial structure in quantum mechanical many-body systems. We show that novel strongly correlated quantum phases can be realized using long-range dipolar interaction in optical lattices. This work opens the door to quantum simulations of a wide range of lattice models with long-range and anisotropic interactions.
  arXiv  Detail & Related papers  (2023-06-01T16:49:20Z)
• Robust Hamiltonian Engineering for Interacting Qudit Systems [50.591267188664666]
  We develop a formalism for the robust dynamical decoupling and Hamiltonian engineering of strongly interacting qudit systems. We experimentally demonstrate these techniques in a strongly-interacting, disordered ensemble of spin-1 nitrogen-vacancy centers.
  arXiv  Detail & Related papers  (2023-05-16T19:12:41Z)
• Universality of critical dynamics with finite entanglement [68.8204255655161]
  We study how low-energy dynamics of quantum systems near criticality are modified by finite entanglement. Our result establishes the precise role played by entanglement in time-dependent critical phenomena.
  arXiv  Detail & Related papers  (2023-01-23T19:23:54Z)
• Operational Metric for Quantum Chaos and the Corresponding Spatiotemporal Entanglement Structure [0.0]
  We demand that the future state of a many-body, isolated quantum system is sensitive to past multitime operations on a small subpart of that system. Our work paves the way to systematically study many-body dynamical phenomena like Many-Body, measurement-Lo phase transitions, and Floquet dynamics.
  arXiv  Detail & Related papers  (2022-10-26T18:00:01Z)
• Detecting entanglement in quantum many-body systems via permutation moments [4.376631240407246]
  We propose a framework for designing multipartite entanglement criteria based on permutation moments. These criteria show strong detection capability in the multi-qubit Ising model with a long-range $XY$ Hamiltonian. Our framework can also be generalized to detect the much more complicated entanglement structure in quantum many-body systems.
  arXiv  Detail & Related papers  (2022-03-16T04:39:54Z)
• Quantum Neuronal Sensing of Quantum Many-Body States on a 61-Qubit Programmable Superconducting Processor [17.470012490921192]
  Classifying many-body quantum states with distinct properties and phases of matter is one of the most fundamental tasks in quantum many-body physics. Here, we propose a new approach called quantum neuronal sensing. We show that our scheme can efficiently classify two different types of many-body phenomena.
  arXiv  Detail & Related papers  (2022-01-16T03:20:04Z)
• Sensing quantum chaos through the non-unitary geometric phase [62.997667081978825]
  We propose a decoherent mechanism for sensing quantum chaos. The chaotic nature of a many-body quantum system is sensed by studying the implications that the system produces in the long-time dynamics of a probe coupled to it.
  arXiv  Detail & Related papers  (2021-04-13T17:24:08Z)
• Preparing random states and benchmarking with many-body quantum chaos [48.044162981804526]
  We show how to predict and experimentally observe the emergence of random state ensembles naturally under time-independent Hamiltonian dynamics. The observed random ensembles emerge from projective measurements and are intimately linked to universal correlations built up between subsystems of a larger quantum system. Our work has implications for understanding randomness in quantum dynamics, and enables applications of this concept in a wider context.
  arXiv  Detail & Related papers  (2021-03-05T08:32:43Z)
• Heterogeneous Multipartite Entanglement Purification for Size-Constrained Quantum Devices [68.8204255655161]
  Purifying entanglement resources after their imperfect generation is an indispensable step towards using them in quantum architectures. Here we depart from the typical purification paradigm for multipartite states explored in the last twenty years. We find that smaller sacrificial' states, like Bell pairs, can be more useful in the purification of multipartite states than additional copies of these same states.
  arXiv  Detail & Related papers  (2020-11-23T19:00:00Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.