Massive Spatial Qubits for Testing Macroscopic Nonclassicality and Casimir Induced Entanglement

• URL: http://arxiv.org/abs/2106.11906v3
• Date: Tue, 6 Jun 2023 10:53:01 GMT
• Title: Massive Spatial Qubits for Testing Macroscopic Nonclassicality and Casimir Induced Entanglement
• Authors: Bin Yi, Urbasi Sinha, Dipankar Home, Anupam Mazumdar, Sougato Bose
• Abstract summary: We introduce a new tool to meet these challenges: massive spatial qubits. We show that if two distinct localized states of a mass are used as the $sigma_x, sigma_y$ and $sigma_z$ bases, then we can measure this encoded spatial qubit. We also show how our methodology, in conjuction with the Casimir interaction, offers a powerful method to create and certify non-Gaussian entanglement between two neutral nano-objects.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: An open challenge in physics is to expand the frontiers of the validity of quantum mechanics by evidencing nonclassicality of the centre of mass state of a macroscopic object. Yet another equally important task is to evidence the essential nonclassicality of the interactions which act between macroscopic objects. Here we introduce a new tool to meet these challenges: massive spatial qubits. In particular, we show that if two distinct localized states of a mass are used as the $|0\rangle$ and $|1\rangle$ states of a qubit, then we can measure this encoded spatial qubit with a high fidelity in the $\sigma_x, \sigma_y$ and $\sigma_z$ bases simply by measuring its position after different durations of free evolution. We show how this technique can be used to reveal an irreducible nonclassicality through a Bell-inequality violation arising from the entanglement of the centre of mass of a nano-crystal with its spin in a Stern-Gerlach setup. Secondly, we show how our methodology, in conjuction with the Casimir interaction, offers a powerful method to create and certify non-Gaussian entanglement between two neutral nano-objects. Fundamentally, the generation of such an entanglement provides an empirical means for demonstrating an inherent quantumness of the Casimir interaction.

Related papers

• Cavity Control of Topological Qubits: Fusion Rule, Anyon Braiding and Majorana-Schrödinger Cat States [39.58317527488534]
  We investigate the impact of introducing a local cavity within the center of a topological chain. This cavity induces a scissor-like effect that bisects the chain, liberating Majorana zero modes (MZMs) within the bulk. By leveraging the symmetry properties of fermion modes within a two-site cavity, we propose a novel method for generating MZM-polariton Schr"odinger cat states.
  arXiv  Detail & Related papers  (2024-09-06T18:00:00Z)
• Quantum dimer models with Rydberg gadgets [0.0]
  Rydberg blockade mechanism is an important ingredient in quantum simulators based on neutral atom arrays. We propose a method to transform the underlying Rydberg blockade into more general constraints. We show that these states can be dynamically prepared with high fidelity.
  arXiv  Detail & Related papers  (2024-02-16T12:54:06Z)
• Enhanced Entanglement in the Measurement-Altered Quantum Ising Chain [46.99825956909532]
  Local quantum measurements do not simply disentangle degrees of freedom, but may actually strengthen the entanglement in the system. This paper explores how a finite density of local measurement modifies a given state's entanglement structure.
  arXiv  Detail & Related papers  (2023-10-04T09:51:00Z)
• Testing the nonclassicality of gravity with the field of a single delocalized mass [55.2480439325792]
  A setup is proposed that is based on a single delocalized mass coupled to a harmonically trapped test mass. We investigate the in-principle feasibility of such an experiment, which turns out to crucially depend on the ability to tame Casimir-Polder forces.
  arXiv  Detail & Related papers  (2023-07-18T15:40:16Z)
• Observation of microscopic confinement dynamics by a tunable topological $\theta$-angle [12.311760383676763]
  We report on the experimental realization of a tunable topological $theta$-angle in a Bose--Hubbard gauge-theory quantum simulator. We demonstrate the rich physics due to this angle by the direct observation of the confinement--deconfinement transition of $(1+1)$-dimensional quantum electrodynamics.
  arXiv  Detail & Related papers  (2023-06-20T18:00:02Z)
• Exploring Large-Scale Entanglement in Quantum Simulation [0.0]
  Entanglement is a distinguishing feature of quantum many-body systems. Here we perform experimental investigations of entanglement based on the entanglement Hamiltonian.
  arXiv  Detail & Related papers  (2023-05-31T18:00:01Z)
• Qubit Vitrification and Entanglement Criticality on a Quantum Simulator [0.0]
  We show that measurements of the qubits in a quantum simulator can lead to criticality, separating two phases of entanglement. Our findings show that measurements alone can trigger entanglement criticality and suggest that coupling to a classical environment can drive critical phenomena in more general quantum states.
  arXiv  Detail & Related papers  (2022-07-27T17:00:18Z)
• Probing Topological Spin Liquids on a Programmable Quantum Simulator [40.96261204117952]
  We use a 219-atom programmable quantum simulator to probe quantum spin liquid states. In our approach, arrays of atoms are placed on the links of a kagome lattice and evolution under Rydberg blockade creates frustrated quantum states. The onset of a quantum spin liquid phase of the paradigmatic toric code type is detected by evaluating topological string operators.
  arXiv  Detail & Related papers  (2021-04-09T00:18:12Z)
• Entropic Uncertainty Relations and the Quantum-to-Classical transition [77.34726150561087]
  We aim to shed some light on the quantum-to-classical transition as seen through the analysis of uncertainty relations. We employ entropic uncertainty relations to show that it is only by the inclusion of imprecision in our model of macroscopic measurements that we can prepare a system with two simultaneously well-defined quantities.
  arXiv  Detail & Related papers  (2020-03-04T14:01:17Z)
• Probing chiral edge dynamics and bulk topology of a synthetic Hall system [52.77024349608834]
  Quantum Hall systems are characterized by the quantization of the Hall conductance -- a bulk property rooted in the topological structure of the underlying quantum states. Here, we realize a quantum Hall system using ultracold dysprosium atoms, in a two-dimensional geometry formed by one spatial dimension. We demonstrate that the large number of magnetic sublevels leads to distinct bulk and edge behaviors.
  arXiv  Detail & Related papers  (2020-01-06T16:59:08Z)

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.