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SUMMARY:Physikalisches Kolloquium: Prof. Dr. Robert König - Quantum f
 ault-tolerance with noisy circuits and entanglement generation
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DESCRIPTION:Titel: Quantum fault-tolerance with noisy circuits and ent
 anglement generation Abstract: A fundamental question in quantum infor
 mation science is: what can noisy quantum circuits actually do? Unders
 tanding the computational and communication power of realistic\, imper
 fect quantum hardware is essential for both near-term applications and
  the long-term development of quantum technologies. A paradigmatic pro
 blem in this context is long-range entanglement generation\, i.e.\, cr
 eating high-quality entangled states between distant qubits using only
  noisy local operations. This task is central to quantum networking an
 d distributed quantum computing\, where shared entanglement across lar
 ge distances serves as the key resource. We study this problem on a re
 ctangular grid of qubits in 2D\, subject to local stochastic Pauli noi
 se. This is a setup that\, depending on the length scale\, describes b
 oth a single quantum device with geometrically limited connectivity an
 d a planar network of constant-sized quantum stations. We give a proto
 col that\, for noise below a constant threshold\, generates a constant
 -fidelity Bell pair between qubits separated by an arbitrarily large d
 istance R. The required grid dimensions scale as Θ(R) × Θ(poly(log 
 R))\, and the protocol runs in constant time (single-shot)\, producing
  a Bell state up to a known Pauli correction. This contrasts with exis
 ting approaches\, which either require local devices whose size grows 
 with the target distance\, or need a distance-dependent number of roun
 ds. Our work provides the first example of a short-range entangled sta
 te in 2D from which long-range Bell pairs can be reliably extracted de
 spite noise\, as well as a 2D-local stabilizer Hamiltonian whose therm
 al states retain this property at constant positive temperature. The t
 alk is based on joint work with Dylan Harley\, arXiv:2604.05870. Sprec
 her / Speaker: Prof. Dr. Robert König\, TU München Kontakt / Contact
 : Prof. Dr. Daniel Burgarth
DTSTART:20260506T100000Z
DTEND:20260506T110000Z
LOCATION:Hörsaal D\, Staudtstr. 5\, 91058 Erlangen
DTSTAMP:20260422T001127Z
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