Quantum Correlations beyond Entanglement and Discord

• URL: http://arxiv.org/abs/2010.03490v2
• Date: Tue, 4 May 2021 16:34:38 GMT
• Title: Quantum Correlations beyond Entanglement and Discord
• Authors: S. K\"ohnke, E. Agudelo, M. Sch\"unemann, O. Schlettwein, W. Vogel, J. Sperling, B. Hage
• Abstract summary: We experimentally realize a form of quantum correlation that exists even in the absence of entanglement and discord. We implement a robust kind of nonclassical photon-photon correlated state with useful applications in quantum information processing.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Dissimilar notions of quantum correlations have been established, each being motivated through particular applications in quantum information science and each competing for being recognized as the most relevant measure of quantumness. In this contribution, we experimentally realize a form of quantum correlation that exists even in the absence of entanglement and discord. We certify the presence of such quantum correlations via negativities in the regularized two-mode Glauber-Sudarshan function. Our data show compatibility with an incoherent mixture of orthonormal photon-number states, ruling out quantum coherence and other kinds of quantum resources. By construction, the quantumness of our state is robust against dephasing, thus requiring fewer experimental resources to ensure stability. In addition, we theoretically show how multimode entanglement can be activated based on the generated, nonentangled state. Therefore, we implement a robust kind of nonclassical photon-photon correlated state with useful applications in quantum information processing.

Related papers

• Detection of mode-intrinsic quantum entanglement [0.0]
  We propose a witness to detect a strong form of entanglement that only non-Gaussian states possess. The strength of our witness is two-fold: it only requires measurements in one basis to check entanglement in any arbitrary mode basis.
  arXiv  Detail & Related papers  (2024-07-25T15:01:47Z)
• Entanglement of photonic modes from a continuously driven two-level system [34.50067763557076]
  We experimentally generate entangled photonic modes by continuously exciting a quantum emitter, a superconducting qubit, with a coherent drive. We show that entanglement is generated between modes extracted from the two sidebands of the resonance fluorescence spectrum. Our approach can be utilized to distribute entanglement at a high rate in various physical platforms.
  arXiv  Detail & Related papers  (2024-07-10T18:48:41Z)
• Persisting quantum effects in the anisotropic Rabi model at thermal equilibrium [0.0]
  We study the long-lived quantum correlations and nonclassical states generated in the anisotropic Rabi model. We demonstrate a stark distinction between virtual excitations produced beyond the strong coupling regime and the quantumness quantifiers once the light-matter interaction has been switched off.
  arXiv  Detail & Related papers  (2023-09-05T10:59:32Z)
• Quantum data learning for quantum simulations in high-energy physics [55.41644538483948]
  We explore the applicability of quantum-data learning to practical problems in high-energy physics. We make use of ansatz based on quantum convolutional neural networks and numerically show that it is capable of recognizing quantum phases of ground states. The observation of non-trivial learning properties demonstrated in these benchmarks will motivate further exploration of the quantum-data learning architecture in high-energy physics.
  arXiv  Detail & Related papers  (2023-06-29T18:00:01Z)
• Fisher information as general metrics of quantum synchronization [23.786196134544927]
  We propose using classical and quantum Fisher information (FI) as alternative metrics to detect and measure quantum synchronization. We show advantages in FI-based measures, especially in 2-to-1 synchronization.
  arXiv  Detail & Related papers  (2023-06-12T07:03:59Z)
• Experimental investigation of quantum uncertainty relations with classical shadows [7.675613458661457]
  We experimentally investigate quantum uncertainty relations construed with relative entropy of coherence. We prepare a family of quantum states whose purity can be fully controlled. Our results indicate the tightness of quantum coherence lower bounds dependents on the reference bases as well as the purity of quantum state.
  arXiv  Detail & Related papers  (2022-02-14T00:26:31Z)
• 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)
• Enhancing nonclassical bosonic correlations in a Quantum Walk network through experimental control of disorder [50.591267188664666]
  We experimentally realize a controllable inhomogenous Quantum Walk dynamics. We observe two photon states which exhibit an enhancement in the quantum correlations between two modes of the network.
  arXiv  Detail & Related papers  (2021-02-09T10:57:00Z)
• Quantum Phases of Matter on a 256-Atom Programmable Quantum Simulator [41.74498230885008]
  We demonstrate a programmable quantum simulator based on deterministically prepared two-dimensional arrays of neutral atoms. We benchmark the system by creating and characterizing high-fidelity antiferromagnetically ordered states. We then create and study several new quantum phases that arise from the interplay between interactions and coherent laser excitation.
  arXiv  Detail & Related papers  (2020-12-22T19:00:04Z)
• Quantifying quantum correlation of quasi-Werner state and probing its suitability for quantum teleportation [0.0]
  We analyze the behavior of the Wigner function of two quasi-Werner states theoretically constructed by superposing two normalized bipartite $m$-photon added coherent states. We show that the performance of the quasi-Werner states as quantum channel for the teleportation of a single-mode coherent and squeezed states, as quantified via teleportation fidelity, improves with the photon addition.
  arXiv  Detail & Related papers  (2020-11-30T11:30:31Z)
• Fragility of quantum correlations and coherence in a multipartite photonic system [4.687258715561434]
  Certain quantum states are well-known to be particularly fragile in the presence of decoherence. It has been conjectured that each of these quantities have various degrees of fragility in the presence of decoherence. We experimentally confirm this conjecture by preparing tripartite photonic states and subjecting them to controlled amounts of dephasing.
  arXiv  Detail & Related papers  (2020-01-03T11:57:24Z)

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.