Publications (12)
Continuous variable versus hybrid schemes for quantum teleportation of Gaussian states
Ioannis Kogias, Sammy Ragy, Gerardo Adesso
In this paper, we examine and compare two fundamentally different teleportation schemes; the well-known continuous variable scheme by Vaidman, Braunstein and Kimble (VBK), and a re…
Quantifying the source of enhancement in experimental continuous variable quantum illumination
Sammy Ragy, Ivano Ruo Berchera, Ivo P. Degiovanni +4
A quantum illumination protocol exploits correlated light beams to enhance the probability of detection of a partially reflecting object lying in a very noisy background. Recently…
Compatibility in Multiparameter Quantum Metrology
Sammy Ragy, Marcin Jarzyna, Rafal Demkowicz-Dobrzanski
Simultaneous estimation of multiple parameters in quantum metrological models is complicated by factors relating to the (i) existence of a single probe state allowing for optimal s…
Improved device-independent randomness expansion rates using two sided randomness
Rutvij Bhavsar, Sammy Ragy, Roger Colbeck
A device-independent randomness expansion protocol aims to take an initial random string and generate a longer one, where the security of the protocol does not rely on knowing the…
A Comparison of Kernels for ABC-SMC
Dennis Prangle, Cecilia Viscardi, Sammy Ragy
A popular method for likelihood-free inference is approximate Bayesian computation sequential Monte Carlo (ABC-SMC) algorithms. These approximate the posterior using a population o…
Nature of light correlations in ghost imaging
Sammy Ragy, Gerardo Adesso
We investigate the nature of correlations in Gaussian light sources used for ghost imaging. We adopt methods from quantum information theory to distinguish genuinely quantum from c…