Dresden 2026 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 17: Decoherence and Open Systems II
QI 17.3: Vortrag
Donnerstag, 12. März 2026, 15:30–15:45, BEY/0137
Cat state preparation and stabilization in open quantum systems — •Suocheng Zhao1, Sofia Qvarfort2,3, and Anja Metelmann1,4,5 — 1IQMT, KIT, 76344 Eggenstein-Leopoldshafen, Germany — 2Nordita, KTH Royal Institute of Technology and Stockholm University, SE-106 91 Stockholm, Sweden — 3Department of Physics, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden — 4TKM, KIT, 76131 Karlsruhe, Germany — 5ISIS, University of Strasbourg and CNRS
Cat states are a valuable resource for quantum metrology applications, promising to enable sensitivity down to the Heisenberg limit. Moreover, Schrödinger cat states, based on a coherent superposition of coherent states, show robustness against the bit-flip error making them a promising candidate for bosonic quantum codes. Despite these advantages, cat states are generally difficult to generate, and their practical usefulness is fundamentally challenged by environmental noise, which degrades both their preparation and subsequent performance. In this talk, I present three complementary strategies for mitigating the impact of noise, illustrated through the preparation and protection of cat states: (1) accelerating state preparation to outrun noise accumulation using self- and cross-Kerr interactions, as well as quantum optimal control, (2) squeezing the cat states to enhance their intrinsic robustness against noise, and (3) engineering tailored dissipative processes that drive the system toward cat states, and counteract noise to extend their lifetime. Together, these approaches pave the way for deploying cat states in practical quantum technologies.
Keywords: Cat state; Engineered open quantum system; Kerr nonlinearity; Quantum control; Squeezing