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Observation of measurement-induced entanglement and quantum trajectories of remote superconducting qubits.

  • Author(s): Roch, N
  • Schwartz, ME
  • Motzoi, F
  • Macklin, C
  • Vijay, R
  • Eddins, AW
  • Korotkov, AN
  • Whaley, KB
  • Sarovar, M
  • Siddiqi, I
  • et al.
Abstract

The creation of a quantum network requires the distribution of coherent information across macroscopic distances. We demonstrate the entanglement of two superconducting qubits, separated by more than a meter of coaxial cable, by designing a joint measurement that probabilistically projects onto an entangled state. By using a continuous measurement scheme, we are further able to observe single quantum trajectories of the joint two-qubit state, confirming the validity of the quantum Bayesian formalism for a cascaded system. Our results allow us to resolve the dynamics of continuous projection onto the entangled manifold, in quantitative agreement with theory.

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