Mathew George

selected publications

1. Broadband waveguide quantum memory for entangled photons

   Saglamyurek, Erhan, Sinclair, Neil, Jin, Jeongwan, Slater, Joshua A., Oblak, Daniel, Bussi{\`e}res, F{\'e}lix, George, Mathew, Ricken, Raimund, Sohler, Wolfgang, and Tittel, Wolfgang

   Nature 2011

   Abs Bib

   Harnessing entanglement between light and material systems is of interest for future quantum information technologies. Two groups report advances in the development of the light--matter quantum interface that could pave the way for the construction of multiplexed quantum repeaters for long-distance quantum networks. Clausen et al. demonstrate entanglement between a photon at the telecommunication wavelength (1,338 nanometres) and a single collective atomic excitation stored in a neodymium-doped Y2SiO5 crystal. Saglamyurek et al. use a thulium-doped LiNbO3 waveguide to achieve a similar entanglement.

   @article{Saglamyurek2011,
     author = {Saglamyurek, Erhan and Sinclair, Neil and Jin, Jeongwan and Slater, Joshua A. and Oblak, Daniel and Bussi{\`e}res, F{\'e}lix and George, Mathew and Ricken, Raimund and Sohler, Wolfgang and Tittel, Wolfgang},
     title = {Broadband waveguide quantum memory for entangled photons},
     journal = {Nature},
     bibtex_show = {true},
     year = {2011},
     month = jan,
     day = {01},
     volume = {469},
     number = {7331},
     pages = {512-515},
     selected = {true},
     issn = {1476-4687},
     doi = {10.1038/nature09719},
     url = {https://doi.org/10.1038/nature09719}
   }

2. In-band pumped Ti:Tm:LiNbO3 waveguide amplifier and low threshold laser

   George, Mathew, Ricken, Raimund, Quiring, Viktor, and Sohler, Wolfgang

   Laser \& Photonics Reviews 2013

   Abs Bib

   Abstract The fabrication by diffusion doping and a detailed optical investigation of a Ti:Tm:LiNbO3 waveguide amplifier and of a Fabry-Pérot type Ti:Tm:LiNbO3 laser are reported. Both devices are in-band pumped by a laser diode at 1650 nm. The wave-guide amplifier shows broad-band optical gain in the wavelength range 1750 nm < λ < 1900 nm. The laser emits at 1890 nm, the longest emission wavelength of a Tm:LiNbO3 laser reported so far; also 1850 nm emission could be demonstrated. Laser threshold (1890 nm) is at 4 mW coupled pump power; the slope efficiency is ∼13.3\%. Properties and potential of both devices are analyzed by extensive modeling.

   @article{https://doi.org/10.1002/lpor.201200063,
     author = {George, Mathew and Ricken, Raimund and Quiring, Viktor and Sohler, Wolfgang},
     title = {In-band pumped Ti:Tm:LiNbO3 waveguide amplifier and low threshold laser},
     journal = {Laser \& Photonics Reviews},
     bibtex_show = {true},
     selected = {true},
     volume = {7},
     number = {1},
     pages = {122-131},
     keywords = {Integrated Optics, Lithium niobate, Optical amplifiers, Rare earth and transition metal solid-state lasers, Diode pumped lasers},
     doi = {https://doi.org/10.1002/lpor.201200063},
     url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/lpor.201200063},
     eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1002/lpor.201200063},
     year = {2013}
   }

3. Two-photon interference of weak coherent laser pulses recalled from separate solid-state quantum memories

   Jin, Jeongwan, Slater, Joshua A., Saglamyurek, Erhan, Sinclair, Neil, George, Mathew, Ricken, Raimund, Oblak, Daniel, Sohler, Wolfgang, and Tittel, Wolfgang

   Nature Communications 2013

   Abs Bib

   Quantum memories allowing reversible transfer of quantum states between light and matter are central to quantum repeaters, quantum networks and linear optics quantum computing. Significant progress regarding the faithful transfer of quantum information has been reported in recent years. However, none of these demonstrations confirm that the re-emitted photons remain suitable for two-photon interference measurements, such as C-NOT gates and Bell-state measurements, which constitute another key ingredient for all aforementioned applications. Here, using pairs of laser pulses at the single-photon level, we demonstrate two-photon interference and Bell-state measurements after either none, one or both pulses have been reversibly mapped to separate thulium-doped lithium niobate waveguides. As the interference is always near the theoretical maximum, we conclude that our solid-state quantum memories, in addition to faithfully mapping quantum information, also preserve the entire photonic wavefunction. Hence, our memories are generally suitable for future applications of quantum information processing that require two-photon interference.

   @article{Jin2013,
     author = {Jin, Jeongwan and Slater, Joshua A. and Saglamyurek, Erhan and Sinclair, Neil and George, Mathew and Ricken, Raimund and Oblak, Daniel and Sohler, Wolfgang and Tittel, Wolfgang},
     title = {Two-photon interference of weak coherent laser pulses recalled from separate solid-state quantum memories},
     journal = {Nature Communications},
     bibtex_show = {true},
     selected = {true},
     year = {2013},
     month = aug,
     day = {29},
     volume = {4},
     number = {1},
     pages = {2386},
     issn = {2041-1723},
     doi = {10.1038/ncomms3386},
     url = {https://doi.org/10.1038/ncomms3386}
   }