Noise effects and tomography of remote entangled spins in quantum dots
We investigate how decoherence affects the entanglement established between two quantum dots in microcavities, and propose a tomographic scheme able to measure the entangled state. The scheme we consider establishes the entanglement via the exchange and measurement of a photon. Making the realistic...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_10980121_v88_n3_p_PineiroOrioli |
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todo:paper_10980121_v88_n3_p_PineiroOrioli2023-10-03T16:06:24Z Noise effects and tomography of remote entangled spins in quantum dots Pineiro-Orioli, A. McCutcheon, D.P.S. Rudolph, T. We investigate how decoherence affects the entanglement established between two quantum dots in microcavities, and propose a tomographic scheme able to measure the entangled state. The scheme we consider establishes the entanglement via the exchange and measurement of a photon. Making the realistic assumption of noise dominated by pure-dephasing processes, we find that the photon must be exchanged and measured on time scales shorter than the quantum dots' characteristic dephasing time for appreciable levels of entanglement to be achieved. The tomographic scheme is able to reconstruct the full density matrix of the quantum dots, and requires only single spin rotations and the injection of an additional photon. Remarkably, we find that the additional photon need not be exchanged and measured on a time scale shorter than the dephasing time for accurate tomography, and also allows many to be used in order to increase the measurement signal. © 2013 American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10980121_v88_n3_p_PineiroOrioli |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
We investigate how decoherence affects the entanglement established between two quantum dots in microcavities, and propose a tomographic scheme able to measure the entangled state. The scheme we consider establishes the entanglement via the exchange and measurement of a photon. Making the realistic assumption of noise dominated by pure-dephasing processes, we find that the photon must be exchanged and measured on time scales shorter than the quantum dots' characteristic dephasing time for appreciable levels of entanglement to be achieved. The tomographic scheme is able to reconstruct the full density matrix of the quantum dots, and requires only single spin rotations and the injection of an additional photon. Remarkably, we find that the additional photon need not be exchanged and measured on a time scale shorter than the dephasing time for accurate tomography, and also allows many to be used in order to increase the measurement signal. © 2013 American Physical Society. |
| format |
JOUR |
| author |
Pineiro-Orioli, A. McCutcheon, D.P.S. Rudolph, T. |
| spellingShingle |
Pineiro-Orioli, A. McCutcheon, D.P.S. Rudolph, T. Noise effects and tomography of remote entangled spins in quantum dots |
| author_facet |
Pineiro-Orioli, A. McCutcheon, D.P.S. Rudolph, T. |
| author_sort |
Pineiro-Orioli, A. |
| title |
Noise effects and tomography of remote entangled spins in quantum dots |
| title_short |
Noise effects and tomography of remote entangled spins in quantum dots |
| title_full |
Noise effects and tomography of remote entangled spins in quantum dots |
| title_fullStr |
Noise effects and tomography of remote entangled spins in quantum dots |
| title_full_unstemmed |
Noise effects and tomography of remote entangled spins in quantum dots |
| title_sort |
noise effects and tomography of remote entangled spins in quantum dots |
| url |
http://hdl.handle.net/20.500.12110/paper_10980121_v88_n3_p_PineiroOrioli |
| work_keys_str_mv |
AT pineirooriolia noiseeffectsandtomographyofremoteentangledspinsinquantumdots AT mccutcheondps noiseeffectsandtomographyofremoteentangledspinsinquantumdots AT rudolpht noiseeffectsandtomographyofremoteentangledspinsinquantumdots |
| _version_ |
1807319935510118400 |