Characterizing d-dimensional quantum channels by means of quantum process tomography

J. J. M. VARGA; L REBÓN; Q. P. STEFANO; C. IEMMI

OPTICS LETTERS

OPTICAL SOC AMER

Lugar: Washington; Año: 2018

0146-9592

In this work we propose a simple optical architecture, based on phase-only programmable spatial light modulators, in order to characterize general processes on photonic spatial quantum systems in a d > 2 Hilbert space. We demonstrate the full reconstruction of typical noises affecting quantum computing, as amplitude shifts, phase shifts, and depolarizing channel in dimension d = 5. We have also reconstructed simulated atmospheric turbulences affecting a free-space transmission of qudits in dimension d = 4. In each case, quantum process tomography (QPT) was performed in order to obtain the matrix c that fully describe the corresponding quantum channel, E. Fidelities between the states experimentally obtained after go through the channel and the expected ones are above 97%.