Phys. Rev. B 67, 241305(R) (2003) [4 pages]Entanglement of solid-state qubits by measurement
We show that two identical solid-state qubits can be made fully entangled (starting from a completely mixed state) with probability 1/4 just by measuring them with a detector, equally coupled to the qubits. This happens in the case of repeated strong (projective) measurements as well as in a more realistic case of weak continuous measurement. In the latter case, the entangled state can be identified by a flat spectrum of the detector shot noise, while the nonentangled state (probability 3/4) leads to a spectral peak at the Rabi frequency with the maximum peak-to-pedestal ratio of 32/3. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.241305
DOI:
10.1103/PhysRevB.67.241305
PACS:
73.21.La, 03.67.-a, 03.65.Ud
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