BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/Denver BEGIN:DAYLIGHT DTSTART:20260308T030000 TZOFFSETFROM:-0700 TZOFFSETTO:-0600 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:MDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20261101T010000 TZOFFSETFROM:-0600 TZOFFSETTO:-0700 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:MST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260320T205430Z UID:CE44C019-F1CD-43C6-82CC-9593AA184F61 DTSTART;TZID=America/Denver:20260320T110000 DTEND;TZID=America/Denver:20260320T120000 DESCRIPTION:Abstract: Entangled photons possess nonclassical correlations t hat can be harnessed for imaging. In contrast to conventional optical imag ing\, quantum imaging based on coincidence detection of entangled photons demonstrated super-resolution beyond the classical diffraction limit. We w ill present both experimental imaging results and the underlying theoretic al framework that explains these advantages.\n\nBecause photons originate from atoms and molecules\, our work also examines atomic physics at the in terface between classical and quantum formalisms. We show that the Bloch e quation\, traditionally regarded as a classical equation of motion\, can b e reformulated to yield the quantum von Neumann and Schrödinger equations . This correspondence reveals a classical origin for the standard quantum spin equations and clarifies the relationship between the two descriptions .\n\nWe have further developed a theory that models the multistage Stern –Gerlach experiment envisioned by Heisenberg and Einstein and conducted by Frische and Segre\, with improved accuracy compared to existing treatme nts. More recently\, we performed quantum measurements of atomic beam spli tting under extremely low magnetic field gradients. Conventional Stern–G erlach experiments rely on strong gradients to spatially resolve the split beams. In contrast\, we use optical spectroscopy to resolve spatially ove rlapping atomic distributions that would otherwise appear inseparable\, th ereby enabling low-field quantum measurements. While conventional theoreti cal models agree with experiments at high magnetic fields\, they exhibit n oticeable discrepancies as the magnetic field gradient approaches zero. Ou r theory remains consistent with experimental observations across the enti re field range. A key outcome of this work is an estimate of the electron spin collapse time\, expressed in dimensionless units of Larmor precession cycles.\n\nFor the three-stage Stern–Gerlach configuration\, our valida tion constitutes a retrospective agreement with historical data. In the si ngle-stage configuration\, the test is prospective. The theoretical framew ork was fixed before the low-field experimental data were acquired\, ensur ing that no post hoc adjustments to the theory were introduced.\n\nSpeaker (s): Lihong\, \n\nBoulder\, Colorado\, United States\, Virtual: https://ev ents.vtools.ieee.org/m/544655 LOCATION:Boulder\, Colorado\, United States\, Virtual: https://events.vtool s.ieee.org/m/544655 ORGANIZER:samuel.oberdick@ieee.org SEQUENCE:12 SUMMARY:Quantum Imaging and the Zero-Magnetic-Field Limit of Quantum Measur ement URL;VALUE=URI:https://events.vtools.ieee.org/m/544655 X-ALT-DESC:Description: <br /><p class="MsoBodyText"><span style="font-fami ly: 'times new roman'\, times\, serif\;"><strong>Abstract:</strong> <span style="font-size: 12.0pt\; mso-fareast-font-family: 'Times New Roman'\; fo nt-style: normal\; mso-bidi-font-style: italic\;">Entangled photons posses s nonclassical correlations that can be harnessed for imaging. In contrast to conventional optical imaging\, quantum imaging based on coincidence de tection of entangled photons demonstrated super-resolution beyond the clas sical diffraction limit. We will present both experimental imaging results and the underlying theoretical framework that explains these advantages.< /span></span></p>\n<p class="MsoNormal" style="text-align: justify\;"><spa n style="font-size: 12.0pt\; font-family: 'Times New Roman'\,serif\; mso-f areast-font-family: 'Times New Roman'\;"><span style="font-family: 'times new roman'\, times\, serif\;">Because photons originate from atoms and mol ecules\, our work also examines atomic physics at the interface between cl assical and quantum formalisms. We show that the Bloch equation\, traditio nally regarded as a classical equation of motion\, can be reformulated to yield the quantum von Neumann and Schr&ouml\;dinger equations. This corres pondence reveals a classical origin for the standard quantum spin equation s and clarifies the relationship between t</span>he two descriptions.</spa n></p>\n<p class="MsoNormal" style="text-align: justify\;"><span style="fo nt-size: 12.0pt\; font-family: 'Times New Roman'\,serif\; mso-fareast-font -family: 'Times New Roman'\;">We have further developed a theory that mode ls the multistage Stern&ndash\;Gerlach experiment envisioned by Heisenberg and Einstein and conducted by Frische and Segre\, with improved accuracy compared to existing treatments. More recently\, we performed quantum meas urements of atomic beam splitting under extremely low magnetic field gradi ents. Conventional Stern&ndash\;Gerlach experiments rely on strong gradien ts to spatially resolve the split beams. In contrast\, we use optical spec troscopy to resolve spatially overlapping atomic distributions that would otherwise appear inseparable\, thereby enabling low-field quantum measurem ents. </span><span style="font-size: 12.0pt\; mso-bidi-font-size: 10.0pt\; font-family: 'Times New Roman'\,serif\; mso-fareast-font-family: 'Times N ew Roman'\;">While conventional theoretical models agree with experiments at high magnetic fields\, they exhibit noticeable discrepancies as the mag netic field gradient approaches zero. </span><span style="font-size: 12.0p t\; font-family: 'Times New Roman'\,serif\; mso-fareast-font-family: 'Time s New Roman'\;">Our theory remains consistent with experimental observatio ns across the entire field range. A key outcome of this work is an estimat e of the electron spin collapse time\, expressed in dimensionless units of Larmor precession cycles.&nbsp\;</span></p>\n<p class="MsoNormal" style=" text-align: justify\;"><span style="font-size: 12.0pt\; font-family: 'Time s New Roman'\,serif\; mso-fareast-font-family: 'Times New Roman'\;">For th e three-stage Stern&ndash\;Gerlach configuration\, our validation constitu tes a retrospective agreement with historical data. </span><span style="fo nt-size: 12.0pt\; mso-bidi-font-size: 10.0pt\; font-family: 'Times New Rom an'\,serif\; mso-fareast-font-family: 'Times New Roman'\;">In the single-s tage configuration\, the test is prospective. The theoretical framework wa s fixed before the low-field experimental data were acquired\, ensuring th at no post hoc adjustments to the theory were introduced.</span></p>\n<p c lass="MsoNormal" style="text-align: justify\;">&nbsp\;</p> END:VEVENT END:VCALENDAR