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URL:/institute-for-quantum-computing/events/iqc-student
 -seminar-featuring-matteo-pennacchietti
SUMMARY:IQC Student Seminar featuring Matteo Pennacchietti
CLASS:PUBLIC
DESCRIPTION:Summary \n\nNEAR-UNITY ENTANGLEMENT FROM AN INDIUM-RICH NANOWIR
 E QUANTUM DOT\nSOURCE COMPATIBLE WITH EFFICIENT QUANTUM KEY DISTRIBUTION\n
 \nThus far\, the workhorse platform for generating entangled photons for\n
 many quantum information experiments has been spontaneous parametric\ndown
  conversion (SPDC). However\, due to their Poissonian photon\nstatistics\,
  these sources cannot operate in the high efficiency limit\nwithout a sign
 ificant reduction in the degree of entanglement. In\ncontrast\, there are 
 no such limits placed on semiconductor quantum\ndots (QDs) embedded in pho
 tonic nanostructures. To date\, near-unity\nentanglement fidelity has not 
 yet been measured from indium-rich QDs\,\nwhich are promising candidates f
 or realizing such a source. We\nperformed quantum state tomography using s
 ingle-photon detectors with\nultra-low timing jitter and employed two-phot
 on resonant excitation.\nWe measured a raw peak concurrence and fidelity o
 f 95.3 +/- 0.5% and\n97.5 +/- 0.8%\, respectively\, as well as lifetime-we
 ighted average\nconcurrence and fidelity of 0.90 +/- 0.04% and 0.94 +/- 0.
 04%\,\nrespectively. These results conclusively demonstrate that most of t
 he\ndegradation from unity-measured entanglement fidelity in earlier\nstud
 ies was not due to spin dephasing. Additionally\, we show that the\nexcito
 n fine structure splitting\, contrary to common understanding\, is\nnot in
  principle a fundamental barrier to implementing QKD with\nsemiconductor Q
 D entangled photon sources.\n\nADD EVENT TO CALENDAR\n\nApple [https://www
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DTSTAMP:20250519T192416Z
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