A recurring principle in many-body physics is that sufficiently distributed interactions or correlations lead to an effectively mean-field description. For fermionic Gaussian states, we establish a quantitative version of this principle directly at the level of Majorana covariance matrices. The main observation is that...
Amir-Reza Negari, Farzin Salek, Z. Zimborás et al.· 1 citation
We study collective state preparation and channel encoding in fermionic systems under parity superselection and composition governed by the canonical anticommutation relations. For a two-mode Gaussian state $\tau$, we obtain the exact entanglement of formation, $E_{\mathrm F}^{\mathrm{phys}}(\tau^{\otimes m})=\lceil m/...
Farzin Salek, Amir-Reza Negari, Graeme Smith et al.· 0 citations
This work constructs finite-block preprocessing schemes whose private information is an entropy difference evaluated at two distributions related by group convolution, and proves nonadditivity at an explicit channel parameter using a two-use encoder, an analytic single-use converse, and certified entropy bounds.
We study the transmission of two independent confidential classical messages over a quantum broadcast channel, one for each receiver. Each message must remain secret from the other receiver, including when that receiver knows its own message. For classical inputs and quantum outputs, we establish the classical Marton-t...
Paula Belzig, S. Ghosal, Farzin Salek et al.· 2 citations
We present a full-oscillator analysis of a finite-energy GKP CHSH test whose observed score yields robust Bell-pair self-testing. Periodically binned position and momentum give the Pauli settings, while a fixed binary coarse-graining of photon number modulo four and its displaced conjugate realize the tilted settings....
Farzin Salek, Masahito Hayashi· 2 citations
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