Quantum state estimation of multi-partite single photon path entanglement via local measurements

• URL: http://arxiv.org/abs/2410.10185v1
• Date: Mon, 14 Oct 2024 06:09:18 GMT
• Title: Quantum state estimation of multi-partite single photon path entanglement via local measurements
• Authors: Hikaru Shimizu, Joe Yoshimoto, Kazufumi Tanji, Aruto Hosaka, Junko Ishi-Hayase, Tomoyuki Horikiri, Rikizo Ikuta, Masahiro Takeoka,
• Abstract summary: Multipartite entanglement plays a critical role in various applications of quantum internet. We propose a method to measure arbitrary multipartite single photon path entangled states by only local measurements.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Multipartite entanglement plays a critical role in various applications of quantum internet. In these applications, the entanglement is usually shared by the distant parties. Experimentally, the distributed entanglement should be estimated by only local measurements. Furthermore, for network experiments, it is desirable to employ measurement techniques that are straightforward to implement. In this paper, we propose a method to measure arbitrary multipartite single photon path entangled states by only local measurements. By considering practically reasonable assumptions, our method is relatively easy to implement. We experimentally demonstrate the utility of this method by reconstructing the density matrix of a 3-qubit W-state.

Related papers

• A unified view of direct measurement of quantum states, processes, and measurements [0.0]
  The dynamics of a quantum system are characterized by three components: quantum state, quantum process, and quantum measurement. We propose a theoretical framework to systematically derive direct measurement methods for these three components. We have experimentally demonstrated the feasibility of the direct measurement method of quantum states using optical pulse trains.
  arXiv  Detail & Related papers  (2024-03-27T02:42:11Z)
• Optimal Local Measurements in Many-body Quantum Metrology [3.245777276920855]
  We propose a method dubbed as the "iterative matrix partition" approach to elucidate the underlying structures of optimal local measurements. We find that exact saturation is possible for all two-qubit pure states, but it is generically restrictive for multi-qubit pure states. We demonstrate that the qCRB can be universally saturated in an approximate manner through adaptive coherent controls.
  arXiv  Detail & Related papers  (2023-09-30T07:34:31Z)
• Simulating Gaussian boson sampling quantum computers [68.8204255655161]
  We briefly review recent theoretical methods to simulate experimental Gaussian boson sampling networks. We focus mostly on methods that use phase-space representations of quantum mechanics. A brief overview of the theory of GBS, recent experiments and other types of methods are also presented.
  arXiv  Detail & Related papers  (2023-08-02T02:03:31Z)
• Activation of quantum steering sharing with unsharp nonlocal product measurements [1.8549313085249322]
  We show that employing unsharp nonlocal product measurements can activate the phenomenon of steering sharing. Our findings demonstrate that nonlocal measurements with unequal strength possess a greater activation capability compared to those with equal strength.
  arXiv  Detail & Related papers  (2023-03-10T14:39:57Z)
• Experimentally determining the incompatibility of two qubit measurements [55.41644538483948]
  We describe and realize an experimental procedure for assessing the incompatibility of two qubit measurements. We demonstrate this fact in an optical setup, where the qubit states are encoded into the photons' polarization degrees of freedom.
  arXiv  Detail & Related papers  (2021-12-15T19:01:44Z)
• Single-photon nonlocality in quantum networks [55.41644538483948]
  We show that the nonlocality of single-photon entangled states can nevertheless be revealed in a quantum network made only of beamsplitters and photodetectors. Our results show that single-photon entanglement may constitute a promising solution to generate genuine network-nonlocal correlations useful for Bell-based quantum information protocols.
  arXiv  Detail & Related papers  (2021-08-03T20:13:24Z)
• Generalized quantum measurements with matrix product states: Entanglement phase transition and clusterization [58.720142291102135]
  We propose a method for studying the time evolution of many-body quantum lattice systems under continuous and site-resolved measurement. We observe a peculiar phenomenon of measurement-induced particle clusterization that takes place only for frequent moderately strong measurements, but not for strong infrequent measurements.
  arXiv  Detail & Related papers  (2021-04-21T10:36:57Z)
• Local and scalable detection of genuine multipartite single-photon path entanglement [0.0]
  A multipartite single-photon path-entangled state can be certified efficiently by means of local measurements. We build an entanglement witness based on local photon detections preceded by displacement operations to reveal genuine multipartite entanglement.
  arXiv  Detail & Related papers  (2021-04-16T16:47:27Z)
• Neural network quantum state tomography in a two-qubit experiment [52.77024349608834]
  Machine learning inspired variational methods provide a promising route towards scalable state characterization for quantum simulators. We benchmark and compare several such approaches by applying them to measured data from an experiment producing two-qubit entangled states. We find that in the presence of experimental imperfections and noise, confining the variational manifold to physical states greatly improves the quality of the reconstructed states.
  arXiv  Detail & Related papers  (2020-07-31T17:25:12Z)
• Mixed-state entanglement from local randomized measurements [2.536333994672575]
  We propose a method for detecting bipartite entanglement in a many-body mixed state based on estimating moments of the partially transposed density matrix. Our method can be applied to any quantum system with single-qubit control.
  arXiv  Detail & Related papers  (2020-07-13T10:58:03Z)
• Direct estimation of quantum coherence by collective measurements [54.97898890263183]
  We introduce a collective measurement scheme for estimating the amount of coherence in quantum states. Our scheme outperforms other estimation methods based on tomography or adaptive measurements. We show that our method is accessible with today's technology by implementing it experimentally with photons.
  arXiv  Detail & Related papers  (2020-01-06T03:50:42Z)

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.