# Lorentz-invariant mass and entanglement of biphoton states

@article{Vintskevich2019LorentzinvariantMA, title={Lorentz-invariant mass and entanglement of biphoton states}, author={Stephen Vintskevich and Dmitry A. Grigoriev and Maxim V. Fedorov}, journal={Laser Physics Letters}, year={2019}, volume={16} }

The concept of the Lorentz-invariant mass of a group of particles is shown to be applicable to biphoton states formed in the process of spontaneous parametric down conversion. The conditions are found when the Lorentz-invariant mass is related directly with (proportional to) the Schmidt parameter determining a high degree of entanglement of a biphoton state with respect to transverse wave vectors of emitted photons.

## 2 Citations

### Mean propagation velocity of multiphoton wave-packet states with nonzero Lorentz-invariant mass

- Physics
- 2020

The concept of Lorenz invariant mass and mean propagation velocity have been investigated in detail for various multiphoton wave-packet states of light. Based on photodetection theory and…

### Effect of an incoherent pump on two-mode entanglement in optical parametric generation

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Pumping a nonlinear crystal by an intense radiation results in the optical parametric generation of photons in two modes (the signal and the idler). The quantized electromagnetic field in these modes…

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