Quantum 2025 – wissenschaftliches Programm

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MON: Monday Contributed Sessions

MON 1: QIP Implementations: Photons I

MON 1.6: Vortrag

Montag, 8. September 2025, 15:30–15:45, ZHG001

Optical Protocol for Generating non-Gaussian state in C-band. — •Elnaz Bazzazi, Roger Alfredo Kögler, Leon Reichgardt, Marco Schmidt, and Oliver Benson — Department of Physics, Humboldt University Berlin, Berlin, Germany

Non-Gaussian states play a crucial role in fault-tolerant quantum computing, where the encoded information is protected from decoherence processes [1]. Certain classes of non-Gaussian states, however, coherent state superpositions known as cat states, pose challenges in generation due to the complexity of breeding protocols and limitations in their output states [2,3]. In this study, we explore the state engineering of squeezed coherent state superpositions (SCSS) through a catalysis protocol [4].

In this scheme, a beam splitter operation applied to two input states: a vacuum squeezed state and an m-photon Fock state, followed by photon number resolving detection in one of the output arms. Simulations results demonstrate the potential of this protocol to generate high-amplitude squeezed cat states with realistic quantum resources. We also outline an experimental implementation, and present the current progress. This research contributes to advances in quantum state engineering methods, crucial for the generation of resource states for fault-tolerant quantum computing.

[1] D. S. Schlegel et al., Phys. Rev. A 106, 022431 (2022).

[2] K. Takase et al., Phys. Rev. A 103, 013710 (2021).

[3] M. Endo et al., Opt. Express 31, 12865 (2023).

[4] R. J. Birrittella et al., J. Opt. Soc. Am. B 35, 1514 (2018).

Keywords: Coherent State Superposition; Squeezed State; Homodyne Detection