Entanglement Generation and Decoherence in a Two-Qubit System Mediated by Relativistic Quantum Field

• URL: http://arxiv.org/abs/2211.09441v1
• Date: Thu, 17 Nov 2022 10:05:02 GMT
• Title: Entanglement Generation and Decoherence in a Two-Qubit System Mediated by Relativistic Quantum Field
• Authors: Yoshimasa Hidaka, Satoshi Iso, Kengo Shimada
• Abstract summary: We study a toy model of a quantum entanglement generation between two spins (qubits) mediated by a relativistic free scalar field. Because of the associated particle creation into an open system, the quantum state of spins is partially decohered. We calculate various quantities such as spin correlations, entanglement entropies, mutual information and negativity, and study their behaviors in various limiting situations.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Motivated by the Bose et al.-Matletto-Vedral (BMV) proposal for detecting quantum superposition of spacetime geometries, we study a toy model of a quantum entanglement generation between two spins (qubits) mediated by a relativistic free scalar field. After time evolution, spin correlation is generated through the interactions with the field. Because of the associated particle creation into an open system, the quantum state of spins is partially decohered. In this paper, we give a comprehensive study of the model based on the closed-time path formalism, focussing on relativistic causality and quantum mechanical complementarity. We calculate various quantities such as spin correlations, entanglement entropies, mutual information and negativity, and study their behaviors in various limiting situations. In particular, we calculate the mutual information of the two spins and compare it with spin correlation functions. We also discuss why no quantum entanglement can be generated unless both spins are causally affected by one another while spin correlations are generated.

Related papers

• Generalized quantum measurement in spin-correlated hyperon-antihyperon decays [11.594851987280764]
  We introduce a generalized quantum measurement description for decay processes of spin-1/2 hyperons. We validate this approach by aligning it with established theoretical calculations. We employ quantum simulation to observe the violation of CHSH inequalities in hyperon decays.
  arXiv  Detail & Related papers  (2024-02-26T13:54:20Z)
• Observation of many-body dynamical localization [12.36065516066796]
  We present evidence for many-body dynamical localization for the Lieb-Liniger version of the many-body quantum kicked rotor. Our results shed light on the boundary between the classical, chaotic world and the realm of quantum physics.
  arXiv  Detail & Related papers  (2023-12-21T14:24:50Z)
• Spin-bounded correlations: rotation boxes within and beyond quantum theory [0.0]
  We prove that quantum theory admits the most general rotational correlations for spins 0, 1/2, and 1. We also prove a metrological game where beyond-quantum resources of spin 3/2 outperform all quantum resources of the same spin. Results illuminate the question of how space constrains the structure of quantum theory.
  arXiv  Detail & Related papers  (2023-12-14T19:00:02Z)
• Effects of intrinsic decoherence on discord-like correlation measures of two-qubit spin squeezing model [0.0]
  Quantum correlation behaviours in the two-qubit spin squeezing model are studied under the influence of intrinsic decoherence. We show that the entanglement suffers from intrinsic decoherence and exhibits sudden death, whereas the other measures are more robust against intrinsic decoherence.
  arXiv  Detail & Related papers  (2023-03-04T11:06:54Z)
• Geometric phases along quantum trajectories [58.720142291102135]
  We study the distribution function of geometric phases in monitored quantum systems. For the single trajectory exhibiting no quantum jumps, a topological transition in the phase acquired after a cycle. For the same parameters, the density matrix does not show any interference.
  arXiv  Detail & Related papers  (2023-01-10T22:05:18Z)
• Intrinsic decoherence effects on correlated coherence and quantum discord in XXZ Heisenberg model [0.0]
  This work characterizes the time evolution of coherence and nonclassical correlations in a two-spin XXZ Heisenberg model. We study the effects of intrinsic decoherence on coherence (correlated coherence) and nonclassical correlations (quantum discord)
  arXiv  Detail & Related papers  (2022-10-31T12:10:33Z)
• Formation of robust bound states of interacting microwave photons [148.37607455646454]
  One of the hallmarks of interacting systems is the formation of multi-particle bound states. We develop a high fidelity parameterizable fSim gate that implements the periodic quantum circuit of the spin-1/2 XXZ model. By placing microwave photons in adjacent qubit sites, we study the propagation of these excitations and observe their bound nature for up to 5 photons.
  arXiv  Detail & Related papers  (2022-06-10T17:52:29Z)
• Quantum correlations and speed limit of central spin system [0.0]
  We consider single, and two-qubit central spin systems interacting with spin baths and discuss their dynamical properties. The impact of the size of the spin bath on the quantum speed limit for a single qubit central spin model is analyzed.
  arXiv  Detail & Related papers  (2022-05-26T07:16:25Z)
• Synthesizing five-body interaction in a superconducting quantum circuit [12.594562121892576]
  We synthesize five-body spin-exchange interaction in a superconducting quantum circuit. A Greenberger-Horne-Zeilinger state is generated in a single step with fidelity estimated to be $0.685$. This study paves a way for quantum simulation involving many-body interactions and high excited states of quantum circuits.
  arXiv  Detail & Related papers  (2021-09-01T11:29:12Z)
• The coherence of quantum dot confined electron- and hole-spin in low external magnetic field [0.0]
  We show for the first time that the spin purity performs complex temporal oscillations. Our studies are essential for the design and optimization of quantum-dot-based entangled multi-photon sources.
  arXiv  Detail & Related papers  (2021-08-11T12:00:30Z)
• Spin Entanglement and Magnetic Competition via Long-range Interactions in Spinor Quantum Optical Lattices [62.997667081978825]
  We study the effects of cavity mediated long range magnetic interactions and optical lattices in ultracold matter. We find that global interactions modify the underlying magnetic character of the system while introducing competition scenarios. These allow new alternatives toward the design of robust mechanisms for quantum information purposes.
  arXiv  Detail & Related papers  (2020-11-16T08:03:44Z)

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.