Network quantum steering enables randomness certification without seed randomness

• URL: http://arxiv.org/abs/2307.08797v4
• Date: Thu, 18 Jul 2024 10:20:51 GMT
• Title: Network quantum steering enables randomness certification without seed randomness
• Authors: Shubhayan Sarkar,
• Abstract summary: 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum networks with multiple sources allow the observation of quantum nonlocality without inputs. Consequently, the incompatibility of measurements is not a necessity for observing quantum nonlocality when one has access to multiple quantum sources. Here we investigate the minimal scenario without inputs where one can observe any form of quantum nonlocality. We show that even two parties with two sources that might be classically correlated can witness a form of quantum nonlocality, in particular quantum steering, in networks without inputs if one of the parties is trusted, that is, performs a fixed known measurement. We term this effect as swap-steering. The scenario presented in this work is minimal to observe such an effect. Consequently, a scenario exists where one can observe quantum steering but not Bell non-locality. We further construct a linear witness to observe swap-steering. Interestingly, this witness enables self-testing of the quantum states generated by the sources and the local measurement of the untrusted party. This in turn allows certifying two bits of randomness that can be obtained from the measurement outcomes of the untrusted device without the requirement of initially feeding the device with randomness.

Related papers

• Quantum coherence in networks [0.0]
  We show that verifying quantum coherence in a network scenario without the need for inputs is not necessary. We show that there exist probability distributions for joint outcomes of three parties in a triangular network. We derive nonlinear inequalities that are satisfied by classical correlations and find quantum states that violate them.
  arXiv  Detail & Related papers  (2024-07-15T18:00:01Z)
• Witnessing network steerability of every bipartite entangled state without inputs [0.0]
  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.
  arXiv  Detail & Related papers  (2024-06-17T18:08:00Z)
• 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)
• Quantum Discord Witness with Uncharacterized Devices [18.751513188036334]
  We propose a new approach using uncharacterized measurements to witness quantum discord of an unknown bipartite state within arbitrary dimension system. The feature of high robustness against device imperfections, such as loss-tolerance and error-tolerance, shows our method is experimentally feasible.
  arXiv  Detail & Related papers  (2023-03-20T14:51:53Z)
• Bell inequalities with overlapping measurements [52.81011822909395]
  We study Bell inequalities where measurements of different parties can have overlap. This allows to accommodate problems in quantum information. The scenarios considered show an interesting behaviour with respect to Hilbert space dimension, overlap, and symmetry.
  arXiv  Detail & Related papers  (2023-03-03T18:11:05Z)
• Simple Tests of Quantumness Also Certify Qubits [69.96668065491183]
  A test of quantumness is a protocol that allows a classical verifier to certify (only) that a prover is not classical. We show that tests of quantumness that follow a certain template, which captures recent proposals such as (Kalai et al., 2022) can in fact do much more. Namely, the same protocols can be used for certifying a qubit, a building-block that stands at the heart of applications such as certifiable randomness and classical delegation of quantum computation.
  arXiv  Detail & Related papers  (2023-03-02T14:18:17Z)
• Self-testing nonlocality without entanglement [0.0]
  We show that a measurement exhibiting nonlocality without entanglement can be certified in a device-independent manner. This result also demonstrates that genuine network quantum nonlocality can be obtained using only non-entangled measurements.
  arXiv  Detail & Related papers  (2022-03-24T16:45:41Z)
• 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)
• 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)
• Characterizing Quantum Correlations In Fixed Input $n$-Local Network Scenario [0.0]
  Quantum nonlocality can be exploited even when all the parties do not have freedom to select inputs randomly. One can utilize such a feature of quantum networks for purpose of entanglement detection of bipartite quantum states.
  arXiv  Detail & Related papers  (2020-04-17T13:19:50Z)
• 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.