Entangled two-qubit states via phonon environment
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CECOI, Elena; CIORNEA, Viorel; ISAR, Aurelian; MACOVEI, Mihai. Entangled two-qubit states via phonon environment. In: Materials Science and Condensed Matter Physics. Ediția 9, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, p. 77.
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Materials Science and Condensed Matter Physics
Ediția 9, 2018
Conferința "International Conference on Materials Science and Condensed Matter Physics"
Chișinău, Moldova, 25-28 septembrie 2018

Entangled two-qubit states via phonon environment

CZU: 530.145+538.945+621.382
Pag. 77-77

Cecoi Elena1, Ciornea Viorel1, Isar Aurelian2, Macovei Mihai1
1 Institute of Applied Physics,
2 Horia Hulubei National Institute of Physics and Nuclear Engineering
Disponibil în IBN: 16 ianuarie 2019


Entanglement plays an essential role in quantum technologies. Therefore the quantum dot systems are intensively investigated recently and also from this reason. A lot of studies with respect to this issue were already performed.  Here, we demonstrate the entanglement creation among a laser pumped pair of two-level quantum dots embedded in a semiconductor substrate. The laser wave-vector is perpendicular to the line connecting the qubits, while the two-level emitters interact with both the environmental electromagnetic field reservoir as well as the phonons thermostat. Surprisingly, we have found that the entanglement between the qubit‘s subsystem components is significantly enhanced due to the environmental phonon reservoir. This occurs because phonons open an additional decay channels which facilitates the entanglement creation [1].  Figure 1 shows the concurrence C [2,3] which characterizes the entanglement among the qubit pair in the presence of phonons. Notice that in this setup, and without phonons, C < 0.5. Larger values for the concurrence are due to phonon population of the anti-symmetrical two-qubit cooperative state [1].