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Sökning: WFRF:(Grosshans Frederic)

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1.
  • Arzani, Francesco, et al. (författare)
  • Random coding for sharing bosonic quantum secrets
  • 2019
  • Ingår i: Physical Review A. - 2469-9934 .- 2469-9926. ; 100:2
  • Tidskriftsartikel (refereegranskat)abstract
    • We consider a protocol for sharing quantum states using continuous variable systems. Specifically we introduce an encoding procedure where bosonic modes in arbitrary secret states are mixed with several ancillary squeezed modes through a passive interferometer. We derive simple conditions on the interferometer for this encoding to define a secret sharing protocol and we prove that they are satisfied by almost any interferometer. This implies that, if the interferometer is chosen uniformly at random, the probability that it may not be used to implement a quantum secret sharing protocol is zero. Furthermore, we show that the decoding operation can be obtained and implemented efficiently with a Gaussian unitary using a number of single-mode squeezers that is at most twice the number of modes of the secret, regardless of the number of players. We benchmark the quality of the reconstructed state by computing the fidelity with the secret state as a function of the input squeezing.
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2.
  • Chabaud, Ulysse, et al. (författare)
  • Classical simulation of Gaussian quantum circuits with non-Gaussian input states
  • 2021
  • Ingår i: Physical Review Research. - 2643-1564. ; 3:3
  • Tidskriftsartikel (refereegranskat)abstract
    • We consider Gaussian quantum circuits supplemented with non-Gaussian input states and derive sufficient conditions for efficient classical strong simulation of these circuits. In particular, we generalise the stellar representation of continuous-variable quantum states to the multimode setting and relate the stellar rank of the input non-Gaussian states, a recently introduced measure of non-Gaussianity, to the cost of evaluating classically the output probability densities of these circuits. Our results have consequences for the strong simulability of a large class of near-term continuous-variable quantum circuits.
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Ferrini, Giulia, 198 ... (2)
Grosshans, Frederic (2)
Markham, Damian (2)
Arzani, Francesco (1)
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