Quantum tomography of time-delocalized single photons

Alessandro Zavatta, Milena D’Angelo, Valentina Parigi +1 more

We have developed a technique for dual-temporal-mode, ultrafast, time-domain, balanced homodyne detection. We have tested it by performing homodyne measurements on pairs of picosecond-duration temporal modes (or “time bins”) carrying a delocalized single photon. The experimental homodyne data have been used to reconstruct both the density matrix and the two-mode Wigner function of the delocalized state, thus showing the correlations existing between the pair of temporal modes carrying the single photon.

Gabriela Barreto Lemos, Victoria Borish, Garrett D. Cole +3 more

Joachim von Zanthier, C. Thiel, Thierry Bastin +2 more

Alessandro Zavatta, Valentina Parigi, Milena D’Angelo +1 more

We report the experimental coherent delocalization of a single photon between two distinct temporal modes. Dual-mode quantum homodyne tomography is used to analyze the state and test for the violation of a Bell’s-type inequality.

Giacomo Mauro D’Ariano, Lorenzo Maccone

Milena D’Angelo, Alessandro Zavatta, Valentina Parigi +1 more

We propose and experimentally verify a novel method for the remote preparation of entangled bits (ebits) made of a single photon coherently delocalized between two well-separated temporal modes. The proposed scheme represents a remotely tunable source for tailoring arbitrary ebits, whether maximally or non-maximally entangled, which is highly desirable for applications in quantum information technology. The remotely prepared ebit is studied by performing two-mode homodyne tomography with an ultra-fast time-domain balanced homodyne detection scheme recently developed in our laboratory.