BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Sabre//Sabre VObject 4.6.0//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Europe/Zurich X-LIC-LOCATION:Europe/Zurich TZURL:http://tzurl.org/zoneinfo/Europe/Zurich BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:19810329T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:19961027T030000 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:news120@bqc.unibas.ch DTSTAMP;TZID=Europe/Zurich:20260302T155716 DTSTART;TZID=Europe/Zurich:20260310T121500 SUMMARY:Spectral Signatures of Dissipative Quantum Chaos Induced by Structu red Internal Degrees of Freedom DESCRIPTION:We study the emergence of dissipative quantum chaos in a two-le vel system that is non-chaotic in isolation but coupled to a set of struct ured internal modes. These internal degrees of freedom exhibit chaotic cha racteristics\, which are imprinted onto the reduced dynamics of the system . From a time-local master equation\, we derive an effective time-dependen t non-Hermitian Liouvillian and analyze its complex eigenvalues at each ti me step. Spectral statistics [1] reveal that the two-level system can reta in clear signatures of quantum chaos present in its internal degree of fre edom\, under certain conditions. We further show that internal degree of f reedominduced chaos correlates with the loss of coherence in the system\, quantified by the degradation of purity [2\, 3]. By extending the model to two qubits\, we examine how chaotic internal modes degrade Hong-Ou-Mandel interference and thus generate particle distinguishability [4]. Our resul ts demonstrate that spectral chaos in unobserved internal degrees of freed om can leave measurable traces in open quantum dynamics and quantum interf erence experiments.\\r\\n\\r\\n[1] P. Kos\, M. Ljubotina\, and T. Prosen\, “Many-body quantum chaos: Analytic connection to random matrix theory\, ” Physical Review X\, vol. 8\, no. 2\, p. 021062\, 2018.\\r\\n[2] C. Dit tel\, G. Dufour\, M.Walschaers\, G.Weihs\, A. Buchleitner\, and R. Keil\, “Totally destructive many-particle interference\,” Phys. Rev. Lett.\, vol. 120\, p. 240404\, Jun 2018.\\r\\n[3] C. Dittel\, G. Dufour\, G. Weihs \, and A. Buchleitner\, “Wave-particle duality of many-body quantum stat es\,” Physical Review X\, vol. 11\, no. 3\, p. 031041\, 2021.\\r\\n[4] M . Berkane\, G. Dufour\, and A. Buchleitner\, “In prepration\,”. X-ALT-DESC:

We study the emergence of dissipative quantum chaos in a two- level system that is non-chaotic in isolation but coupled to a set of stru ctured internal modes. These internal degrees of freedom exhibit chaotic c haracteristics\, which are imprinted onto the reduced dynamics of the syst em. From a time-local master equation\, we derive an effective time-depend ent non-Hermitian Liouvillian and analyze its complex eigenvalues at each time step. Spectral statistics [1] reveal that the two-level system can re tain clear signatures of quantum chaos present in its internal degree of f reedom\, under certain conditions. We further show that internal degree of freedominduced chaos correlates with the loss of coherence in the system\ , quantified by the degradation of purity [2\, 3]. By extending the model to two qubits\, we examine how chaotic internal modes degrade Hong-Ou-Mand el interference and thus generate particle distinguishability [4]. Our res ults demonstrate that spectral chaos in unobserved internal degrees of fre edom can leave measurable traces in open quantum dynamics and quantum inte rference experiments.

\n\n

[1] P. Kos\, M. Ljubotina\, and T. Prosen\ , “Many-body quantum chaos: Analytic connection to random matrix theory\ ,” Physical Review X\, vol. 8\, no. 2\, p. 021062\, 2018< /strong>.

\n

[2] C. Dittel\, G. Dufour\, M.Walschaers\, G.Weihs\, A. Buchleitner\, and R. Keil\, “Totally destructive many-particle interfere nce\,” Phys. Rev. Lett.\, vol. 120\, p. 240404\, Jun 2018 .

\n

[3] C. Dittel\, G. Dufour\, G. Weihs\, and A. Buchleitn er\, “Wave-particle duality of many-body quantum states\,” Physical Review X\, vol. 11\, no. 3\, p. 031041\, 2021.

\n

[4] M. Berkane\, G. Dufour\, and A. Buchleitner\, “In prepration\,” .

DTEND;TZID=Europe/Zurich:20260310T125500 END:VEVENT BEGIN:VEVENT UID:news29@bqc.unibas.ch DTSTAMP;TZID=Europe/Zurich:20241228T175556 DTSTART;TZID=Europe/Zurich:20241218T180000 SUMMARY:Georg H. Endress Christmas Dinner 2024 DESCRIPTION:This years GHE christmas dinner will be held at Schlossbergrest aurant Dattler located up the hill with a nice view over Freiburg. X-ALT-DESC:This years GHE christmas dinner will be held at Schlossbergresta urant Dattler located up the hill with a nice view over Freiburg. END:VEVENT BEGIN:VEVENT UID:news30@bqc.unibas.ch DTSTAMP;TZID=Europe/Zurich:20241228T180623 DTSTART;TZID=Europe/Zurich:20241218T161500 SUMMARY:GHE Seminar DESCRIPTION:Further details:\\r\\nSpeaker: GHE Fellow Michal Lipka\, (Unive rsity of Basel\, Treutlein Group)\\r\\nDate: Wednesday\, December 18th\, 2 024 at 16:15 – 17:00\\r\\nPlace: University Freiburg\, Seminar room 915\ , Physik Hochhaus X-ALT-DESC:

Further details:

\n

Speaker: GHE Fellow Michal Lipka\, (University of Basel\, Treutlein Group)

\n

Da te: Wednesday\, December 18th\, 2024 at 16:15 – 17:00

\n

< strong>Place: University Freiburg\, Seminar room 915\, Physik Hoc hhaus

DTEND;TZID=Europe/Zurich:20241218T170000 END:VEVENT BEGIN:VEVENT UID:news31@bqc.unibas.ch DTSTAMP;TZID=Europe/Zurich:20241228T180757 DTSTART;TZID=Europe/Zurich:20240529T161500 SUMMARY:GHE Seminar DESCRIPTION:Direct Observation of Quantum Phase Transition in a Radical Mol ecule on the Pb(111) Superconductor\\r\\n\\r\\nSpeaker: Chao Li (Universit y of Basel\, Meyer Group) X-ALT-DESC:Direct Observation of Quantum Phase Transition in a Radical Mole cule on the Pb(111) Superconductor\n\nSpeaker: Chao Li (University of Base l\, Meyer Group) DTEND;TZID=Europe/Zurich:20240529T170000 END:VEVENT END:VCALENDAR