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15 papers · 2 filters
Quantum state tomography with non-instantaneous measurements, imperfections and decoherence
Pierre Six, Philippe Campagne-Ibarcq, Igor Dotsenko +3
Tomography of a quantum state is usually based on positive operator-valued measure (POVM) and on their experimental statistics. Among the available reconstructions, the maximum-lik…
Observing quantum state diffusion by heterodyne detection of fluorescence
P. Campagne-Ibarcq, P. Six, L. Bretheau +4
A qubit can relax by fluorescence, which prompts the release of a photon into its electromagnetic environment. By counting the emitted photons, discrete quantum jumps of the qubit…
Adaptive low-rank approximation and denoised Monte-Carlo approach for high-dimensional Lindblad equations
Claude Le Bris, Pierre Rouchon, Julien Roussel
We present a twofold contribution to the numerical simulation of Lindblad equations. First, an adaptive numerical approach to approximate Lindblad equations using low-rank dynamics…
Training Schrödinger's cat: quantum optimal control
Stefffen J. Glaser, Ugo Boscain, Tommaso Calarco +9
It is control that turns scientific knowledge into useful technology: in physics and engineering it provides a systematic way for driving a system from a given initial state into a…
Practical Position-Based Quantum Cryptography
Kaushik Chakraborty, Anthony Leverrier
We study a general family of quantum protocols for position verification and present a new class of attacks based on the Clifford hierarchy. These attacks outperform current strate…
Arbitrarily long relativistic bit commitment
Kaushik Chakraborty, André Chailloux, Anthony Leverrier
We consider the recent relativistic bit commitment protocol introduced by Lunghi et al. [Phys. Rev. Lett. 2015] and present a new security analysis against classical attacks. In pa…