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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-6942
DTSTART:20220503T160000Z
DTEND:20220503T170000Z
DTSTAMP:20260414T114404Z
LAST-MODIFIED:20220502T154838Z
LOCATION:virtual\, for joining info see: https://calendars.illinois.ed
 u/detail/1958?eventId=33421220
SUMMARY:Simulation of some Open Quantum Systems on Near-term Quantum C
 omputers\, Wisconsin Quantum Institute\, Barbara A. Jones\, Quantum Ap
 plications in Physical and Life Sciences\, IBM Research Almaden
DESCRIPTION:Open quantum systems are everywhere in real life\, whether
  it is systems exposed to temperature\, electric field\, or anything t
 hat causes dissipation and/or driving. I will be describing a few such
  systems that we have simulated on quantum computing hardware\, which 
 turns out to be an excellent platform for such simulations. In the fir
 st\, we use the dissipation naturally occurring in superconducting qub
 its to map to the heat and relaxation-caused dissipation in an experim
 ental system. This system is one of radical pairs of molecules in solu
 tion\, caused by excitation of the solution with a radiation burst. Th
 e system oscillates between singlet and triplet\, with a decay constan
 t at high and low field that we map to that of the quantum computer. W
 e get excellent agreement with experimental results out to many time s
 teps.[1) The second set of hardware experiments were done on a model s
 ystem\, the Hubbard model\, in two limiting cases.[2] In the nonintera
 cting\, infinite system\, we are able to perform 1000 Trotter steps wi
 thout decay of the measured quantity\, a calculation that involved hun
 dreds of CNOT gates. This illustrates the potential for such driven\, 
 dissipative system for simulation on a quantum computer. In the second
  version of the Hubbard model\, we go to the opposite limit\, and look
  at the Hubbard ‘atom” in a magnetic field and finite temperature.
  We are able to calculate quite accurately several physical properties
  of this system. I will conclude with some remarks about the promise o
 f open quantum systems and of quantum computing in general.
URL:https://www.physics.wisc.edu/events/?id=6942
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