General many-body entanglement swapping protocol

• URL: http://arxiv.org/abs/2506.22430v1
• Date: Fri, 27 Jun 2025 17:56:55 GMT
• Title: General many-body entanglement swapping protocol
• Authors: Santeri Huhtanen, Yousef Mafi, Ali G. Moghaddam, Teemu Ojanen,
• Abstract summary: We introduce a many-body entanglement swapping protocol, which allows two non-signaling parties to share general many-body states along an arbitrary partitioning.<n>The shared many-body state retains exactly the same Schmidt vectors as the target state and exhibits typically high fidelity.<n>We provide a proof of concept of the protocol on real quantum hardware and discuss how it enables new functionalities, such as flexible sharing of complex multi-qubit states and fault-tolerant entanglement swapping.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Sharing entangled pairs between non-signaling parties via entanglement swapping constitutes a striking demonstration of the nonlocality of quantum mechanics and a crucial building block for future quantum technologies. In this work, we generalize pair-swapping methods by introducing a many-body entanglement swapping protocol, which allows two non-signaling parties to share general many-body states along an arbitrary partitioning. The shared many-body state retains exactly the same Schmidt vectors as the target state and exhibits typically high fidelity, which approaches unity as the variance of the Schmidt coefficients vanishes. The cost of many-body swapping - arising from postselection in a third-party measurement - is determined by the 3rd R\'enyi entanglement entropy of the partitioning. We provide a proof of concept of the protocol on real quantum hardware and discuss how it enables new functionalities, such as flexible sharing of complex multi-qubit states and fault-tolerant entanglement swapping.

Related papers

• Scalable multiparty steering based on a single pair of entangled qubits [0.6553834611557042]
  We show that multiparty loophole-free quantum steering is achievable by constructing a quantum network from a set of qubits of which only one pair is entangled. This work introduces a scalable approach to rigorously verify quantum nonlocality across multiple parties, thus providing a practical tool towards developing the future quantum internet.
  arXiv  Detail & Related papers  (2023-08-04T13:01:51Z)
• Multipartite entanglement theory with entanglement-nonincreasing operations [55.2480439325792]
  We extend the resource theory of entanglement for multipartite systems beyond the standard framework of local operations and classical communication.<n>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)
• Conference key agreement in a quantum network [67.410870290301]
  Quantum conference key agreement (QCKA) allows multiple users to establish a secure key from a shared multi-partite entangled state. In a quantum network, this protocol can be efficiently implemented using a single copy of a N-qubit Greenberger-Horne-Zeilinger (GHZ) state to distil a secure N-user conference key bit.
  arXiv  Detail & Related papers  (2022-07-04T18:00:07Z)
• 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-state multi-party semiquantum key agreement protocol based on multi-particle GHZ entangled states [3.312385039704987]
  We propose a single-state three-party semiquantum key agreement (SQKA) protocol with three-particle GHZ entangled states first. Detailed security analysis turns out that the proposed single-state three-party SQKA protocol is secure against several famous attacks from an outside eavesdropper.
  arXiv  Detail & Related papers  (2021-12-11T00:13:16Z)
• Transmon platform for quantum computing challenged by chaotic fluctuations [55.41644538483948]
  We investigate the stability of a variant of a many-body localized (MBL) phase for system parameters relevant to current quantum processors. We find that these computing platforms are dangerously close to a phase of uncontrollable chaotic fluctuations.
  arXiv  Detail & Related papers  (2020-12-10T19:00:03Z)
• Heterogeneous Multipartite Entanglement Purification for Size-Constrained Quantum Devices [68.8204255655161]
  Purifying entanglement resources after their imperfect generation is an indispensable step towards using them in quantum architectures. Here we depart from the typical purification paradigm for multipartite states explored in the last twenty years. We find that smaller sacrificial' states, like Bell pairs, can be more useful in the purification of multipartite states than additional copies of these same states.
  arXiv  Detail & Related papers  (2020-11-23T19:00:00Z)
• Entanglement purification by counting and locating errors with entangling measurements [62.997667081978825]
  We consider entanglement purification protocols for multiple copies of qubit states. We use high-dimensional auxiliary entangled systems to learn about number and positions of errors in the noisy ensemble.
  arXiv  Detail & Related papers  (2020-11-13T19:02:33Z)
• Entangled state generation via quantum walks with multiple coins [2.471925498075058]
  Entanglement swapping provides an efficient method to generate entanglement in quantum communication protocols. We propose a novel scheme to generate entangled state including two-qubit entangled state, two-qudit entangled state, three-qubit GHZ state and three-qudit GHZ state between several designate parties via the model of quantum walks with multiple coins.
  arXiv  Detail & Related papers  (2020-11-03T11:39:40Z)
• Computing conditional entropies for quantum correlations [10.549307055348596]
  In particular, we find new upper bounds on the minimal global detection efficiency required to perform device-independent quantum key distribution. We introduce the family of iterated mean quantum R'enyi divergences with parameters $alpha_k = 1+frac12k-1$ for positive integers $k$. We show that the corresponding conditional entropies admit a particularly nice form which, in the context of device-independent optimization, can be relaxed to a semidefinite programming problem.
  arXiv  Detail & Related papers  (2020-07-24T15:27:51Z)
• 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.