Fast initialization of Bell states with Schr\"odinger cats in multi-mode systems

TL;DR

This paper presents a method for rapidly creating entangled Bell states of cat qubits in multi-mode systems by switching between Kerr Hamiltonians, enabling efficient quantum state initialization.

Contribution

It introduces a novel approach to generate entangled cat states directly from Kerr Hamiltonian manipulations, improving initialization speed for quantum computing.

Findings

Efficient adiabatic and diabatic transformations of multi-mode cat states.

Direct initialization of entangled Bell states from Kerr Hamiltonians.

Potential for faster quantum state preparation in continuous variable systems.

Abstract

Schr\"odinger 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. 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 lowest two Fock states by switching off the drive. To perform operations with several cat qubits one crucial task is to create entanglement between them. Here, we demonstrate efficient transformations of multi-mode cat states through adiabatic and diabatic switching between Kerr-type Hamiltonians with degenerate ground state manifolds. These transformations can be used to directly initialize the cats as entangled Bell states in contrast to initializing them from entangled Fock states.