@article {pilnyak_quantum_2019,
	title = {Quantum tomography of photon states encoded in polarization and picosecond time bins},
	journal = {Phys. Rev. A},
	volume = {100},
	number = {4},
	year = {2019},
	note = {Publisher: American Physical Society},
	month = {oct},
	pages = {043826},
	abstract = {A single photon has many physical degrees of freedom (DOF) that can carry the state of a high-dimensional quantum system. Nevertheless, only a single DOF is usually used in any specific demonstration. Furthermore, when more DOF are being used, they are analyzed and measured one at a time. We introduce a two-qubit information system, realized by two degrees of freedom of a single photon: polarization and time. The photon arrival time is divided into two time bins representing a qubit, while its polarization state represents a second qubit. The time difference between the two time bins is created without an interferometer at the picosecond scale, which is much smaller than the detector{\textquoteright}s response time. The two physically different DOF are analyzed simultaneously by photon bunching between the analyzed photon and an ancilla photon. Full two-qubit states encoded in single photons were reconstructed using quantum state tomography, both when the two DOF were entangled and when they were not, with fidelities higher than 96\%.},
	doi = {10.1103/PhysRevA.100.043826},
	url = {https://link.aps.org/doi/10.1103/PhysRevA.100.043826},
	author = {Pilnyak, Y. and Zilber, P. and Cohen, L. and Eisenberg, H. S.}
}
