2014/02/28 by Nicolas Roch, Mollie E. Schwartz, Felix Motzoi +7
Physics and Astronomy · #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevlett.112.170501
published as Physical Review Letters, 112(17), 170501 (2014) · Supplemental material added and minor corrections
arxiv created 2014/05/02 · arxiv updated 2014/05/05
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.