Detector Based Evaluation of Extractable Entanglement in Flat spacetime

• URL: http://arxiv.org/abs/2505.15716v1
• Date: Wed, 21 May 2025 16:25:14 GMT
• Title: Detector Based Evaluation of Extractable Entanglement in Flat spacetime
• Authors: Hiromasa Tajima, Riku Yoshimoto, Ryo Nemoto, Yuki Osawa,
• Abstract summary: Entanglement entropy is widely used to quantify quantum correlations in field theory.<n>It remains unclear how much of the entanglement is physically extractable via local measurements.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entanglement entropy (EE) is widely used to quantify quantum correlations in field theory, with the well-known result in two-dimensional conformal field theory (CFT) predicting a logarithmic divergence with the ultraviolet (UV) cutoff. However, this expression lacks operational meaning: it remains unclear how much of the entanglement is physically extractable via local measurements. In this work, we investigate the operationally accessible entanglement by employing a pair of Unruh-DeWitt detectors, each interacting with complementary regions of a quantum field. We derive an upper bound on the entanglement that can be harvested by such detectors and show that it scales as a double logarithm with respect to the UV cutoff-significantly weaker than the single-logarithmic divergence of the standard CFT result. This work provides an operational perspective on field-theoretic entanglement and sets fundamental limits on its extractability.

Related papers

• Entangled Unruh-DeWitt detectors amplify quantum coherence [10.476470705835427]
  We explore the quantum coherence between a pair of entangled Unruh-DeWitt detectors, interacting with a quantum field, using a nonperturbative approach.<n>For a maximally entangled state, increasing the coupling strength enhances the detectors' initial quantum coherence while simultaneously causing a monotonic decrease in their initial entanglement.<n>This reveals a remarkable phenomenon: through nonperturbative interactions, entangled Unruh-DeWitt detectors can exhibit a dual effect-amplifying quantum coherence while degrading quantum entanglement.
  arXiv  Detail & Related papers  (2025-06-17T02:16:36Z)
• Derivative coupling in horizon brightened acceleration radiation: a quantum optics approach [0.09986418756990156]
  Horizon Brightened Acceleration Radiation (HBAR) signifies a unique radiation process and provides a promising framework in exploring acceleration radiation in flat/ curved spacetime.<n>Our results suggest that the transition probability for the point-like detector is independent of its frequency.<n>This can be interpreted as the influence of the local gravitational field which modifies the sensitivity of the detector to its frequency and broadens its effective frequency range.
  arXiv  Detail & Related papers  (2025-05-22T16:58:22Z)
• Active Hypothesis Testing for Quantum Detection of Phase-Shift Keying Coherent States [21.270496914042997]
  This paper explores the quantum detection of Phase-Shift Keying (PSK)-coded coherent states through the lens of active hypothesis testing.<n>With coherent state slicing, we formulate the problem as a controlled sensing task in which observation kernels have parameters shrinking with sample size.<n>Surprisingly, the exponent-optimal open-loop policy for binary PSK with high dark counts is not simply time-sharing.
  arXiv  Detail & Related papers  (2025-01-27T17:09:01Z)
• Bipartite Relativistic Quantum Information from Effective Field Theory Approach with Implications to Contextual Meanings of Locality and Quantumness [0.023020018305241332]
  We study the relativistic quantum information (RQI) of two static UDW-charged qubits with or without a black hole.<n>The RQI of the quantum state of the mediator field can be probed by the reduced final states of UDW detectors.<n>We find that QFT and RQI agree on quantumness based on different physical reasons but may not agree on locality.
  arXiv  Detail & Related papers  (2024-11-14T12:56:45Z)
• Embezzling entanglement from quantum fields [41.94295877935867]
  Embezzlement of entanglement refers to the counterintuitive possibility of extracting entangled quantum states from a reference state of an auxiliary system. We uncover a deep connection between the operational task of embezzling entanglement and the mathematical classification of von Neumann algebras.
  arXiv  Detail & Related papers  (2024-01-14T13:58:32Z)
• Entanglement Structures in Quantum Field Theories II: Distortions of Vacuum Correlations Through the Lens of Local Observers [0.0]
  Local regions of a quantum field can be limited by classical correlations. This protocol offers insight and practical guidance for clarifying the unavoidable distortion of quantum field correlations when viewed from the vantage of a pair of local observers.
  arXiv  Detail & Related papers  (2023-04-09T02:53:01Z)
• Non-perturbative simple-generated interactions with a quantum field for arbitrary Gaussian states [0.0]
  We extend the relativistic quantum channel associated to non-perturbative models to include a very large class of Gaussian states of the quantum field. We show that all physical results involving the non-vacuum Gaussian states can be rephrased in terms of interaction with the vacuum state. In these non-perturbative models it is possible to perform exact computation of the R'enyi entropy.
  arXiv  Detail & Related papers  (2022-07-03T22:55:31Z)
• Extracting work from correlated many-body quantum systems [2.0305676256390934]
  The presence of correlations in the input state of a non-interacting many-body quantum system can lead to an increase in the amount of work we can extract from it under global unitary processes. We observe that in the thermodynamic limit of large number of sites, complete work extraction can be attained for relatively small correlation strength.
  arXiv  Detail & Related papers  (2021-10-12T18:00:00Z)
• Experimental study of decoherence of the two-mode squeezed vacuum state via second harmonic generation [19.5474623165562]
  We report a novel scheme on the study of decoherence of a two-mode squeezed vacuum state via its second harmonic generation signal. Our scheme can directly extract the decoherence of the phase-sensitive quantum correlation $langle hatahatbrangle$ between two entangled modes. This is an experimental study on the decoherence effect of a squeezed vacuum state, which has been rarely investigated.
  arXiv  Detail & Related papers  (2020-12-22T05:38:24Z)
• Discrimination of quantum states under locality constraints in the many-copy setting [18.79968161594709]
  We prove that the optimal average error probability always decays exponentially in the number of copies. We show an infinite separation between the separable (SEP) and PPT operations by providing a pair of states constructed from an unextendible product basis (UPB) On the technical side, we prove this result by providing a quantitative version of the well-known statement that the tensor product of UPBs is a UPB.
  arXiv  Detail & Related papers  (2020-11-25T23:26:33Z)
• Entanglement and Complexity of Purification in (1+1)-dimensional free Conformal Field Theories [55.53519491066413]
  We find pure states in an enlarged Hilbert space that encode the mixed state of a quantum field theory as a partial trace. We analyze these quantities for two intervals in the vacuum of free bosonic and Ising conformal field theories.
  arXiv  Detail & Related papers  (2020-09-24T18:00:13Z)
• Probing eigenstate thermalization in quantum simulators via fluctuation-dissipation relations [77.34726150561087]
  The eigenstate thermalization hypothesis (ETH) offers a universal mechanism for the approach to equilibrium of closed quantum many-body systems. Here, we propose a theory-independent route to probe the full ETH in quantum simulators by observing the emergence of fluctuation-dissipation relations. Our work presents a theory-independent way to characterize thermalization in quantum simulators and paves the way to quantum simulate condensed matter pump-probe experiments.
  arXiv  Detail & Related papers  (2020-07-20T18:00:02Z)
• The role of boundary conditions in quantum computations of scattering observables [58.720142291102135]
  Quantum computing may offer the opportunity to simulate strongly-interacting field theories, such as quantum chromodynamics, with physical time evolution. As with present-day calculations, quantum computation strategies still require the restriction to a finite system size. We quantify the volume effects for various $1+1$D Minkowski-signature quantities and show that these can be a significant source of systematic uncertainty.
  arXiv  Detail & Related papers  (2020-07-01T17:43:11Z)

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.