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American Physical Society, Physical Review Letters, 17(112), 2014

DOI: 10.1103/physrevlett.112.170501

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

Journal article published in 2014 by Nicolas Roch, Kb Birgitta Whaley, Mollie E. Schwartz, Schwartz M. E, Felix Motzoi, Christopher Macklin, Rajamani Vijay, Andrew W. Eddins ORCID, Alexander N. Korotkov, Korotkov A. N, Whaley K. B, K. Birgitta Whaley, Mohan Sarovar, Irfan Siddiqi
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Supplemental material added and minor corrections ; International audience ; 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.