Fast generation of Schr\"odinger cat states in a Kerr-tunable superconducting resonator

• URL: http://arxiv.org/abs/2308.14676v1
• Date: Mon, 28 Aug 2023 16:12:52 GMT
• Title: Fast generation of Schr\"odinger cat states in a Kerr-tunable superconducting resonator
• Authors: X.L. He, Yong Lu, D.Q. Bao, Hang Xue, W.B. Jiang, Zhen Wang, A.F. Roudsari, Per Delsing, J.S. Tsai, Z.R. Lin
• Abstract summary: We present a novel strategy to generate and store cat states in a coplanar superconducting circuit by the fast modulation of Kerr nonlinearity. We are able to prepare a 2-component cat state in our chip-based device with a fidelity reaching 89.1% under a 96 ns gate time.
• Score: 5.124453024604881
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Schr\"odinger cat states, quantum superpositions of macroscopically distinct classical states, are an important resource for quantum communication, quantum metrology and quantum computation. Especially, cat states in a phase space protected against phase-flip errors can be used as a logical qubit. However, cat states, normally generated in three-dimensional cavities, are facing the challenges of scalability and controllability. Here, we present a novel strategy to generate and store cat states in a coplanar superconducting circuit by the fast modulation of Kerr nonlinearity. At the Kerr-free work point, our cat states are passively preserved due to the vanishing Kerr effect. We are able to prepare a 2-component cat state in our chip-based device with a fidelity reaching 89.1% under a 96 ns gate time. Our scheme shows an excellent route to constructing a chip-based bosonic quantum processor.

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