44 citations · 147 across the 25 of their papers we have counts for
4 papers · 1 filter
Non-producibility of arbitrary non-Gaussian states using zero-mean Gaussian states and partial photon number resolving detection
Christos N. Gagatsos, Saikat Guha
Gaussian states and measurements collectively are not powerful-enough resources for quantum computing, as any Gaussian dynamics can be simulated efficiently, classically. However,…
Fundamental limits of quantum-secure covert communication over bosonic channels
Michael S. Bullock, Christos N. Gagatsos, Saikat Guha +1
We investigate the fundamental limit of quantum-secure covert communication over the lossy thermal noise bosonic channel, the quantum-mechanical model underlying many practical cha…
Efficient representation of Gaussian states for multi-mode non-Gaussian quantum state engineering via subtraction of arbitrary number of photons
Christos Gagatsos, Saikat Guha
We introduce a complete description of a multi-mode bosonic quantum state in the coherent-state basis (which in this work is denoted as "" function ), which---up to a phase---is…
Quantum enhanced estimation of diffusion
Dominic Branford, Christos N. Gagatsos, Jai Grover +2
Momentum diffusion is a possible mechanism for driving macroscopic quantum systems towards classical behaviour. Experimental tests of this hypothesis rely on a precise estimation o…