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Entangling Schrödinger's cat states by bridging discrete- and continuous-variable encoding.

Daisuke Hoshi1,2, Toshiaki Nagase1,2, Sangil Kwon3

  • 1Department of Physics, Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.

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This study demonstrates a hybrid discrete-variable/continuous-variable (DV-CV) approach for quantum computing using superconducting Kerr parametric oscillators. It successfully entangles Schrödinger

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Area of Science:

  • Quantum Information Processing
  • Quantum Computing Architectures
  • Superconducting Quantum Systems

Background:

  • Quantum information processing utilizes discrete-variable (DV) and continuous-variable (CV) approaches.
  • Integrating DV and CV methods offers potential to overcome limitations of individual approaches.
  • Superconducting Kerr parametric oscillators (KPOs) are a promising platform for quantum computation.

Purpose of the Study:

  • To demonstrate a DV-CV hybrid approach for entangling quantum states.
  • To implement a universal set of quantum gates in a KPO system.
  • To advance the development of multi-qubit platforms based on KPOs.

Main Methods:

  • Entanglement of Schrödinger's cat states using a DV-CV hybrid approach in KPOs.
  • Entanglement-preserving conversion between Fock-state (DV) and cat-state (CV) bases.
  • Implementation of a quantum gate operation between two cat states using Fock-state encoding procedures.

Main Results:

  • Successful entanglement of a pair of Schrödinger's cat states.
  • Demonstration of two distinct methods for achieving DV-CV hybrid entanglement.
  • Completion of a universal quantum gate set within the KPO system.

Conclusions:

  • The DV-CV hybrid approach offers powerful applications for quantum information processing.
  • This work represents a significant step towards multi-qubit platforms using planar KPO systems.
  • The developed methods pave the way for enhanced quantum computation capabilities.