Volume 77, Number 5, March 2007
|Number of page(s)||5|
|Published online||26 February 2007|
A non-Markovian optical signature for detecting entanglement in coupled excitonic qubits
Departamento de Física, Universidad de Los Andes - A.A, 4976, Bogotá, Colombia
2 Physics Department, Clarendon Laboratory, Oxford University - Oxford, OX1 3PU, UK
Accepted: 23 January 2007
We identify an optical signature for detecting entanglement in experimental nanostructure systems comprising coupled excitonic qubits. This signature owes its strength to non-Markovian dynamical effects in the second-order temporal coherence function of the emitted radiation. We calculate autocorrelation and cross-correlation functions for both selective and collective light excitation, and prove that the coherence properties of the emitted light do indeed carry information about the entanglement of the initial multi-qubit state. We also show that this signature can survive in the presence of a noisy environment.
PACS: 03.65.Yz – Decoherence; open systems; quantum statistical methods / 03.65.Ud – Entanglement and quantum nonlocality / 78.67.Hc – Quantum dots
© Europhysics Letters Association, 2007
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