Entangling entanglement: coupling frequency and polarization of
biphotons on demand
- URL: http://arxiv.org/abs/2311.14173v1
- Date: Thu, 23 Nov 2023 19:35:50 GMT
- Title: Entangling entanglement: coupling frequency and polarization of
biphotons on demand
- Authors: Arash Riazi, Eric Y. Zhu, Dan Xu, and Li Qian
- Abstract summary: Quantum information is often carried in the frequency and polarization degrees of freedom (DoFs) in single photons and entangled photons.
We show a new approach to couple and decouple the frequency and polarization DoFs of broadband biphotons.
Our approach offers a convenient means of tuning the polarization entanglement and can be employed for arbitrary biphoton polarization state generation.
- Score: 7.450721110075674
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quantum information is often carried in the frequency and polarization
degrees of freedom (DoFs) in single photons and entangled photons. We
demonstrate a new approach to couple and decouple the frequency and
polarization DoFs of broadband biphotons. Our approach is based on a
common-path nonlinear interferometer (CP-NLI) with a linear dispersive medium
and a polarization controller sandwiched in between two nonlinear media that
generate the interfering biphotons. By adjusting the polarization controller,
we can effectively manipulate the two DoFs. When the two DoFs are decoupled,
maximally polarization-entangled biphotons are observed in the polarization
DoF, while interference fringes are observed in the spectral intensity of the
biphotons. When the two DoFs are coupled, however, interference fringes
disappear from the spectral intensity and instead appear in the degree of
polarization entanglement. The degree of polarization entanglement quantified
by concurrence in principle can vary from 0 to 1 depending on the signal and
idler photon frequencies. Our approach offers a convenient means of tuning the
polarization entanglement and can be employed for arbitrary biphoton
polarization state generation, with applications in quantum information
processing and the study of fundamental physics.
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