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.
Published Web Location
https://doi.org/10.1103/PhysRevLett.112.170501Abstract
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. © 2014 American Physical Society.
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