BEGIN:VCALENDAR
PRODID:-//AddEvent Inc//AddEvent.com v1.7//EN
VERSION:2.0
BEGIN:VTIMEZONE
TZID:America/New_York
BEGIN:STANDARD
DTSTART:20261101T010000
RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
END:STANDARD
BEGIN:DAYLIGHT
DTSTART:20260308T030000
RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
END:DAYLIGHT
END:VTIMEZONE
BEGIN:VEVENT
DESCRIPTION:Towards all-solid state cryocooling from 300 K to 10 mK\n\nMatthew A. Grayson - Northwestern University\n\nAbstract: \n\nCurrent cryogenic cooling technology for solid-state quantum computers relies on the non-renewable resource of helium-4 and its even rarer isotope helium-3.  Given the volatility of the global supply chain for these elements\, new technologies need to be developed to achieve cryogenic temperatures without their use.  This talk theoretically proposes an all-solid state milliKelvin refrigeration mechanism\, constructing an electron heat pump from a gallium-arsenide (GaAs) quantum well that could\, in principle\, cool from 300 mK to 10 mK. This heat pump would drive electrostatic gate-tunable subband degeneracy in a semiconductor quantum well in an Otto cycle to achieve cooling power\, with the help of electrostatic heat switches.  The theory of operation for such a device will be explained and the theoretical cooling powers predicted. Materials challenges and physical constraints to this vision for a possible all-solid state milliKelvin refrigerator will be discussed.  Such a device could initially serve as a ‘booster’ for enhancing base-temperature in dilution refrigerators\, and eventually serve as the low-temperature component of an all-solid state cryocooler.
X-ALT-DESC;FMTTYPE=text/html:Towards all-solid state cryocooling from 300 K to 10 mK<br />Matthew A. Grayson - Northwestern University<br><br>Abstract: <br><br>Current cryogenic cooling technology for solid-state quantum computers relies on the non-renewable resource of helium-4 and its even rarer isotope helium-3.  Given the volatility of the global supply chain for these elements, new technologies need to be developed to achieve cryogenic temperatures without their use.  This talk theoretically proposes an all-solid state milliKelvin refrigeration mechanism, constructing an electron heat pump from a gallium-arsenide (GaAs) quantum well that could, in principle, cool from 300 mK to 10 mK. This heat pump would drive electrostatic gate-tunable subband degeneracy in a semiconductor quantum well in an Otto cycle to achieve cooling power, with the help of electrostatic heat switches.  The theory of operation for such a device will be explained and the theoretical cooling powers predicted. Materials challenges and physical constraints to this vision for a possible all-solid state milliKelvin refrigerator will be discussed.  Such a device could initially serve as a ‘booster’ for enhancing base-temperature in dilution refrigerators, and eventually serve as the low-temperature component of an all-solid state cryocooler.
UID:171faa443cf24811a67fa2f4e6194246addeventcom
SUMMARY:IQC Special Seminar featuring Matthew A. Grayson
DTSTART;TZID=America/New_York:20260908T140000
DTEND;TZID=America/New_York:20260908T150000
DTSTAMP:20260821T195527Z
TRANSP:OPAQUE
STATUS:CONFIRMED
SEQUENCE:0
LOCATION:QNC 0101
X-MICROSOFT-CDO-BUSYSTATUS:BUSY
BEGIN:VALARM
TRIGGER:-PT30M
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
END:VEVENT
END:VCALENDAR