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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2308.12813 |
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| _version_ | 1866916107933188096 |
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| author | Ferreira, J. L. Montenegro Bernardo, B. de Lima |
| author_facet | Ferreira, J. L. Montenegro Bernardo, B. de Lima |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_12813 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Quantum state tomography of photon's polarization and path degrees of freedom Ferreira, J. L. Montenegro Bernardo, B. de Lima Quantum Physics 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. |
| title | Quantum state tomography of photon's polarization and path degrees of freedom |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2308.12813 |