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7 papers · 2 filters
A simple proof that Gaussian attacks are optimal among collective attacks against continuous-variable quantum key distribution with a Gaussian modulation
Anthony Leverrier, Philippe Grangier
In this paper, we give a simple proof of the fact that the optimal collective attacks against continous-variable quantum key distribution with a Gaussian modulation are Gaussian at…
Information Flow in Secret Sharing Protocols
Elham Kashefi, Damian Markham, Mehdi Mhalla +1
The entangled graph states have emerged as an elegant and powerful quantum resource, indeed almost all multiparty protocols can be written in terms of graph states including measur…
Security of continuous-variable QKD: exploiting symmetries in phase space
Anthony Leverrier, Evgueni Karpov, Philippe Grangier +1
Proving the unconditional security of a quantum key distribution (QKD) scheme is a highly challenging task as one needs to determine the most efficient attack compatible with exper…
A quantum de Finetti theorem in phase space representation
Anthony Leverrier, Nicolas J. Cerf
The quantum versions of de Finetti's theorem derived so far express the convergence of n-partite symmetric states, i.e., states that are invariant under permutations of their n par…
Strong no-go theorem for Gaussian quantum bit commitment
Loïck Magnin, Frédéric Magniez, Anthony Leverrier +1
Unconditionally secure bit commitment is forbidden by quantum mechanics. We extend this no-go theorem to continuous-variable protocols where both players are restricted to use Gaus…
The geometric measure of entanglement for a symmetric pure state with positive amplitudes
Masahito Hayashi, Damian Markham, Mio Murao +2
In this paper for a class of symmetric multiparty pure states we consider a conjecture related to the geometric measure of entanglement: 'for a symmetric pure state, the closest pr…