Gaussian quantum discord and the monogamy relation in de Sitter space

Wu, Shu-Min; Zeng, Hao‐Sheng; Liu, Tonghua

doi:10.1007/s11128-022-03632-4

Cited by 4 publications

(9 citation statements)

References 52 publications

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“…We calculate N-partite coherence and obtain its analytical expression in the de Sitter background. We find that with an increase in the curvature, N-partite coherence increases monotonically, whereas quantum correlation decreases monotonically as the curvature increases in de Sitter universes [25][26][27][28]. Therefore, we can gain a deeper understanding of the multiverse from the perspective of quantum resources.…”

Section: N − Nmentioning

confidence: 84%

“…When the momentum p decreases, the curvature effect becomes stronger. Therefore, we can probe the curvature effect on multipartite coherence by varying the momentum p [25][26][27][28][29].…”

Section: Sitter Space G µνmentioning

confidence: 99%

“…Using the Bogoliubov transformation between the op-erators, the Bunch-Davies vacuum and single particle excitation states can be constructed from the states in the R and L regions [28], which can be expressed as…”

Section: Sitter Space G µνmentioning

confidence: 99%

“…Using these, entanglement entropy between two causally disconnected regions in de Sitter space has been studied in the Bunch-Davies vacuum and α-vacua [19][20][21][22][23][24]. Motivated by this, quantum steering, entanglement, and discord were also studied [25][26][27][28][29]. Because it has been shown that quantum entanglement between causally separated regions (beyond the size of the Hubble horizon) exists in de Sitter space, there may be observable effects of quantum correlations on the cosmic microwave background (CMB) in our expanding universe.…”

Section: Introductionmentioning

confidence: 99%

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Curvature-enhanced multipartite coherence in the multiverse*

Wu 吴,

Wang 王,

Wang 王

et al. 2024

Chinese Phys. C

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Here, we study quantum coherence of N-partite GHZ (Greenberger-Horne-Zeilinger) and W states in themultiverse consisting of N causally disconnected de Sitter spaces. Interestingly, N-partite coherence in-creases monotonically as the curvature increases, while the curvature effect destroys quantum entanglementand discord, meaning that the curvature effect is beneficial to quantum coherence and harmful to quantumcorrelations in the multiverse. We find that, with the increase of n expanding de Sitter spaces, N-partitecoherence of GHZ state increases monotonically for any curvature, while quantum coherence of the W statedecreases or increases monotonically depending on the curvature. We find a distribution relationship, whichindicates that the correlated coherence of N-partite W state is equal to the sum of all bipartite correlated coherence in the multiverse. Multipartite coherence exhibits unique properties in the multiverse, which argues that it may provide some evidence for the existence of the multiverse.

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Section: N − Nmentioning

confidence: 84%

Section: Sitter Space G µνmentioning

confidence: 99%

Section: Sitter Space G µνmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Curvature-enhanced multipartite coherence in the multiverse*

Wu 吴,

Wang 王,

Wang 王

et al. 2024

Chinese Phys. C

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“…User applies single particle operation to encode their own secret information but they cannot get any information about the private key through the public key. In addition, we introduce a key generation centre as voting management center for key distribution so that to meet the needs of real voting scenarios [19].…”

Section: Quantum Public Key Encryptionmentioning

confidence: 99%

A receipt-free quantum voting protocol based on quantum public key encryption and quantum key agreement

Shi

Huang

et al. 2023

Phys. Scr.

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To better protect the privacy of voters, a receipt-free quantum voting protocol is first proposed, which adopts quantum key agreement and quantum public key encryption with single photons. We employ Lagrange interpolation polynomials and random numbers to blind the voting information on the bulletin board, so that it can minimize the public information. Furthermore, our receipt-free quantum voting protocol is information-theoretically secure, i.e., the eavesdropper cannot get any voting information by collecting both the quantum ciphertext and the public information. In addition, compared with the existing quantum voting protocols, our protocol can meet more security attributes, such as anonymity, unrepeatability, verifiability legitimacy and especially, receipt-freeness.

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