Controllable generation of mixed two-photon states
Jibo Dai, Yink Loong Len, Yong Siah Teo, Leonid A. Krivitsky, and, Berthold-Georg Englert
TL;DR
This paper presents a controllable method for generating mixed two-photon quantum states with adjustable entanglement and purity using a two-type-I crystal setup and polarization rotators, verified by quantum state tomography.
Contribution
The authors introduce a simple, adjustable technique for producing mixed two-photon states with tunable properties, enhancing experimental control in quantum optics.
Findings
Generated states match theoretical predictions.
Method allows precise control over entanglement and mixedness.
States characterized successfully by quantum state tomography.
Abstract
We report a controllable method for producing mixed two-photon states via Spontaneous Parametric Down-Conversion with a two-type-I crystal geometry. By using variable polarization rotators (VPRs), one obtains mixed states of various purities and degrees of entanglement depending on the parameters of the VPRs. The generated states are characterized by quantum state tomography. The experimental results are found to be in good agreement with the theory. The method can be easily implemented for various experiments which require the generation of states with controllable degrees of entanglement or mixedness.
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