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DTSTART;TZID=America/Toronto:20230614T120000
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URL:https://uwaterloo.ca/institute-for-quantum-computing/events/iqc-student
 -seminar-featuring-matteo-pennacchietti
LOCATION:QNC - Quantum Nano Centre 200 University Avenue West QNC 1201 Wate
 rloo ON N2L 3G1 Canada
SUMMARY:IQC Student Seminar featuring Matteo Pennacchietti
CLASS:PUBLIC
DESCRIPTION:NEAR-UNITY ENTANGLEMENT FROM AN INDIUM-RICH NANOWIRE QUANTUM DO
 T\nSOURCE COMPATIBLE WITH EFFICIENT QUANTUM KEY DISTRIBUTION\n\nThus far\,
  the workhorse platform for generating entangled photons for\nmany quantum
  information experiments has been spontaneous parametric\ndown conversion 
 (SPDC). However\, due to their Poissonian photon\nstatistics\, these sourc
 es cannot operate in the high efficiency limit\nwithout a significant redu
 ction in the degree of entanglement. In\ncontrast\, there are no such limi
 ts placed on semiconductor quantum\ndots (QDs) embedded in photonic nanost
 ructures. To date\, near-unity\nentanglement fidelity has not yet been mea
 sured from indium-rich QDs\,\nwhich are promising candidates for realizing
  such a source. We\nperformed quantum state tomography using single-photon
  detectors with\nultra-low timing jitter and employed two-photon resonant 
 excitation.\nWe measured a raw peak concurrence and fidelity of 95.3 +/- 0
 .5% and\n97.5 +/- 0.8%\, respectively\, as well as lifetime-weighted avera
 ge\nconcurrence and fidelity of 0.90 +/- 0.04% and 0.94 +/- 0.04%\,\nrespe
 ctively. These results conclusively demonstrate that most of the\ndegradat
 ion from unity-measured entanglement fidelity in earlier\nstudies was not 
 due to spin dephasing. Additionally\, we show that the\nexciton fine struc
 ture splitting\, contrary to common understanding\, is\nnot in principle a
  fundamental barrier to implementing QKD with\nsemiconductor QD entangled 
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DTSTAMP:20260407T053916Z
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