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SUMMARY:Quantum Circuits for Imaginary Time Evolution - Chiara Leadbeater\
 , University of Cambridge
DTSTART:20250528T133000Z
DTEND:20250528T143000Z
UID:TALK224707@talks.cam.ac.uk
CONTACT:Lisa Masters
DESCRIPTION:Accurate prediction of ground-state electronic energies is ess
 ential for understanding chemical reactivity\, catalysis\, and material pr
 operties. One of the most promising applications of quantum computers is t
 he simulation of chemical systems. While imaginary time evolution (ITE) is
  widely used on classical hardware to obtain ground states\, its implement
 ation on quantum hardware is challenging due to its non-unitary nature.\n\
 nNear-term approaches to this problem have relied on heuristics\, compromi
 sing their accuracy. As we enter the early fault-tolerant era of quantum c
 omputing\, there is growing interest in the development of more natively q
 uantum algorithms. Since it is not possible to implement a non-unitary gat
 e deterministically\, we resort to probabilistic ITE (PITE) algorithms. Th
 ese embed the ITE operator inside a larger unitary matrix\, which is acces
 sed via post-selection of "successful" mid-circuit measurements. In our pr
 evious work\, we introduced a novel PITE algorithm that yields shorter cir
 cuits and is easier to implement than existing PITE approaches [1].\n\nThi
 s talk will provide an introduction to quantum circuits\, before focusing 
 on the challenges associated with PITE algorithms. In particular\, we will
  discuss the feasibility of implementing an Amplitude Amplification routin
 e [2]\, as well as a new "boosting" procedure\, which uses successive refl
 ection operations to boost to lower energy states [3].\n\n[1] C. Leadbeate
 r\, N. Fitzpatrick\, D. M. Ramo\, and A. J. W. Thom\, Quantum Sci. Technol
 . 9\, 045007 (2024).\n[2] H. Nishi\, T. Kosugi\, Y. Nishiya\, and Y.-i. Ma
 tsushita\, Phys. Rev. B 110\, 174302 (2024).\n[3] B. C. B. Symons\, D. Man
 awadu\, D. Galvin\, and S. Mensa\, Phys. Rev. Res. 6\, L022041 (2024).
LOCATION:Unilever Lecture Theatre\, Yusuf Hamied Department of Chemistry
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