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Time-bin entangled photon pairs from spontaneous parametric down-conversion pumped by a cw multi-mode diode laser.
Optics Express
|October 24, 2013
Summary
Researchers developed a new method for generating time-bin entanglement using spontaneous parametric down-conversion (SPDC) with a multi-mode laser. This approach offers a cost-effective way to create high-quality entangled photon sources for quantum communication.
Area of Science:
- Quantum optics
- Quantum information science
Background:
- Time-bin entanglement is crucial for quantum communication.
- Existing methods rely on specific spontaneous parametric down-conversion (SPDC) pumping regimes (narrowband or double-pulse).
Purpose of the Study:
- To propose and experimentally demonstrate a novel regime for generating time-bin entanglement.
- To utilize the coherence revival property of a continuous-wave (cw) multi-mode laser for SPDC.
Main Methods:
- Utilized a Franson interferometer with two unbalanced Mach-Zehnder interferometers.
- Employed a cw multi-mode laser to pump the SPDC process, exploiting its short coherence length and coherence revival.
- Experimentally demonstrated the proposed scheme.
Main Results:
- Achieved high-visibility two-photon Franson interference.
- Successfully generated high-quality time-bin entangled photon pairs.
Conclusions:
- A new, efficient regime for generating time-bin entanglement has been established.
- Inexpensive cw multi-mode diode lasers can be used to develop high-quality time-bin entanglement sources.
- This advancement has significant implications for various quantum communication applications.
