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Quantum Information and Measurement (QIM)

Quantum Tomography of Photon States Encoded in Polarization and Time

Y. Pilnyak, Pini Zilber, Lior Cohen, H. S. Eisenberg

Published Jan 1, 2017• 1 citation
Publisher

Abstract

We introduce a two-qubit information system, realized by two degrees of freedom in a single photon: polarization and picosecond time-bin. We demonstrate the reconstruction of two-qubit information encoded in a photon using quantum state tomography.
DOI
10.1364/qim.2017.qw6c.4

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Quantum state tomography (QST), the process through which the density matrix of a quantum system is characterized from measurements of specific observables, is a fundamental pillar in the fields of quantum information and computation. In this work, we propose a simple QST method to reconstruct the density matrix of two qubits encoded in the polarization and path degrees of freedom of a single photon, which can be realized with a single linear-optical setup. We demonstrate that the density matrix can be fully described in terms of the Stokes parameters related to the two possibles paths of the photon, together with a quantum version of the two-point Stokes parameters introduced here. Our findings put forward photonic circuits for the investigation of the dynamics of open quantum systems.
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