Witnessing network steerability of every bipartite entangled state without inputs

• URL: http://arxiv.org/abs/2406.11994v2
• Date: Sat, 29 Jun 2024 14:51:41 GMT
• Title: Witnessing network steerability of every bipartite entangled state without inputs
• Authors: Shubhayan Sarkar,
• Abstract summary: We consider quantum networks and focus on the swap-steering scenario without inputs. We find linear witnesses of network steerability corresponding to any negative partial transpose (NPT) bipartite state. We construct linear inequalities to witness swap-steerability of every bipartite entangled state.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum steering is an asymmetric form of quantum nonlocality where one can detect whether a measurement on one system can steer or change another distant system. It is well-known that there are quantum states that are entangled but unsteerable in the standard quantum steering scenario. Consequently, a long-standing open problem in this regard is whether the steerability of every entangled state can be activated in some way. In this work, we consider quantum networks and focus on the swap-steering scenario without inputs and find linear witnesses of network steerability corresponding to any negative partial transpose (NPT) bipartite state and a large class of bipartite states that violate the computable cross-norm (CCN) criterion. Furthermore, by considering that the trusted party can perform tomography of the incoming subsystems, we construct linear inequalities to witness swap-steerability of every bipartite entangled state. Consequently, for every bipartite entangled state one can now observe a form of quantum steering.

Related papers

• Measurement-Device-Independent Detection of Beyond-Quantum State [53.64687146666141]
  We propose a measurement-device-independent (MDI) test for beyond-quantum state detection. We discuss the importance of tomographic completeness of the input sets to the detection.
  arXiv  Detail & Related papers  (2023-12-11T06:40:13Z)
• Optimal quantum violations of n-locality inequalities with conditional dependence on inputs [0.0]
  Bell experiment in the network gives rise to a form of quantum nonlocality which is conceptually different from traditional multipartite Bell nonlocality. We introduce an elegant sum-of-squares approach that enables the optimization in quantum theory without specifying the dimension of the quantum system.
  arXiv  Detail & Related papers  (2023-11-08T11:51:04Z)
• Asymmetric One-Sided Semi-Device-Independent Steerability of Quantum Discordant States [0.0]
  Superlocality and superunsteerability provide operational characterization of quantum correlations in certain local and unsteerable states respectively. We show that a two-way nonzero quantum discord is not necessary to demonstrate superunsteerability. Just like one-way steerability occurs for certain Bell-local states in a one-sided device-independent way, our result shows that one-way steerability can also occur for certain nonsuperlocal states but in a one-sided semi-device-independent way.
  arXiv  Detail & Related papers  (2023-07-18T10:04:45Z)
• Network quantum steering enables randomness certification without seed randomness [0.0]
  Quantum networks with multiple sources allow the observation of quantum nonlocality without inputs. We show that even two parties with two sources that might be classically correlated can witness a form of quantum nonlocality.
  arXiv  Detail & Related papers  (2023-07-17T19:32:17Z)
• Control landscape of measurement-assisted transition probability for a three-level quantum system with dynamical symmetry [77.34726150561087]
  Quantum systems with dynamical symmetries have conserved quantities which are preserved under coherent controls. Incoherent control can increase the maximal attainable transition probability. We show that all critical points are global maxima, global minima, saddle points and second order traps.
  arXiv  Detail & Related papers  (2023-07-14T16:12:21Z)
• Multipartite entanglement theory with entanglement-nonincreasing operations [91.3755431537592]
  We extend the resource theory of entanglement for multipartite systems beyond the standard framework of local operations and classical communication. We demonstrate that in this adjusted framework, the transformation rates between multipartite states are fundamentally dictated by the bipartite entanglement entropies of the respective quantum states.
  arXiv  Detail & Related papers  (2023-05-30T12:53:56Z)
• Experimental demonstration of optimal unambiguous two-out-of-four quantum state elimination [52.77024349608834]
  A core principle of quantum theory is that non-orthogonal quantum states cannot be perfectly distinguished with single-shot measurements. Here we implement a quantum state elimination measurement which unambiguously rules out two of four pure, non-orthogonal quantum states.
  arXiv  Detail & Related papers  (2022-06-30T18:00:01Z)
• Exploring entanglement resource in Si quantum dot systems with operational quasiprobability approach [0.9137554315375919]
  We characterize the quantum entanglement of the realistic two-qubit signals that are sensitive to charge noises. We employ the marginal operational quasiprobability (OQ) approach that allows negative values of the probability function if a given state is entangled.
  arXiv  Detail & Related papers  (2022-03-30T08:05:57Z)
• Efficient Bipartite Entanglement Detection Scheme with a Quantum Adversarial Solver [89.80359585967642]
  Proposal reformulates the bipartite entanglement detection as a two-player zero-sum game completed by parameterized quantum circuits. We experimentally implement our protocol on a linear optical network and exhibit its effectiveness to accomplish the bipartite entanglement detection for 5-qubit quantum pure states and 2-qubit quantum mixed states.
  arXiv  Detail & Related papers  (2022-03-15T09:46:45Z)
• Computable steering criterion for bipartite quantum systems [8.812233192854949]
  Quantum steering describes the ability of one observer to nonlocally affect the other observer's state through local measurements. We propose a computable steering criterion that is applicable to bipartite quantum systems of arbitrary dimensions.
  arXiv  Detail & Related papers  (2020-10-02T03:58:28Z)
• Genuine Network Multipartite Entanglement [62.997667081978825]
  We argue that a source capable of distributing bipartite entanglement can, by itself, generate genuine $k$-partite entangled states for any $k$. We provide analytic and numerical witnesses of genuine network entanglement, and we reinterpret many past quantum experiments as demonstrations of this feature.
  arXiv  Detail & Related papers  (2020-02-07T13:26:00Z)

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.