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SUMMARY:Toward discovering novel physics with a NISQ processor - Pedram Ro
 ushan (Google)
DTSTART:20220621T120000Z
DTEND:20220621T130000Z
UID:TALK174206@talks.cam.ac.uk
CONTACT:Jan Behrends
DESCRIPTION:In 2019\, it was experimentally demonstrated that a quantum pr
 ocessor could perform certain computational tasks exponentially faster tha
 n a classical computer [1]. Going beyond this milestone\, we seek to utili
 ze these Noisy Intermediate Scale Quantum (NISQ) processors to study compu
 tationally intractable physics problems\, such as systems of interacting p
 articles. One of the hallmarks of interacting systems is the formation of 
 multi-particle bound states. In a ring of 24 superconducting qubits\, we i
 mplement the periodic quantum circuit of the spin-1/2 XXZ model\, an arche
 typal model of interaction [2]. By placing microwave photons in adjacent q
 ubit sites\, we study the propagation of these excitations. By introducing
  interactions between the ring and additional qubits\, we observe an unexp
 ected resilience of the bound states to integrability breaking. This findi
 ng goes against the common wisdom that bound states in non-integrable syst
 ems are unstable when their energies overlap with the continuum spectrum. 
 Our work provides experimental evidence for bound states of interacting ph
 otons and discovers their stability beyond the integrability limit.  If ti
 me permits\, I will discuss another recent project which elucidates the no
 ise sensitivity of symmetry-protected Majorana edge modes in a solid-state
  environment [3]. \n\n[1] Nature 574\, 505–510 (2019)\n[2] arXiv: 2206.0
 5254\n[3] arXiv: 2204.11372
LOCATION:TCM Seminar Room
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