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DY: Fachverband Dynamik und Statistische Physik

DY 12: Quantum Coherence and Quantum Information Systems (joint session TT/DY)

DY 12.2: Vortrag

Dienstag, 18. März 2025, 10:00–10:15, H31

Fast Initialisation of Bell States in Kerr Cat Qubits — •Miriam Resch¹, Ciprian Padurariu¹, Björn Kubala^1,2, and Joachim Ankerhold¹ — ¹ICQ and IQST, Ulm University, Ulm, Germany — ²Institute of Quantum Technologies, German Aerospace Center (DLR), Ulm, Germany

Schrödinger cat states play an important role for applications in continuous variable quantum information technologies. As macroscopic superpositions they are inherently protected against certain types of noise making cat qubits a promising candidate for quantum computing [1]. It has been shown recently that cat states occur naturally in driven Kerr parametric oscillators (KPOs) as degenerate ground states with even and odd parity that are adiabatically connected to the respective Fock states by switching off the drive [2]. To perform operations with several cat qubits one crucial task is to create entanglement between them. This can be done by initializing the cats from entangled Fock states or by performing operations directly in cat space. Here we show efficient transformations of multi mode cat states through adiabatic and diabatic switching between Kerr-type Hamiltonians with degenerate ground state manifolds and show how those transformations can be used to directly initialize the cat states as entangled Bell states.
[1] Réglade et al., Nature 629, 778 (2024);
[2] Puri et al., npj Quantum Inf. 3, 18 (2017).

Keywords: cat qubit; Kerr parametric oscillator (KPO)