Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 11: Quantum information systems: mostly quantum dots
HL 11.2: Vortrag
Montag, 11. März 2013, 12:15–12:30, H16
Post-selective Entanglement Generation with solid state single photon sources — •Alexander Pawlis1,2, Klaus Lischka1, and Yoshihisa Yamamoto2 — 1Universität Paderborn, Paderborn, Deutschland — 2Stanford University, Palo Alto, California
The ability to isolate single fluorine donors in nano-structures fabricated from fluorine doped ZnMgSe/ZnSe QWs allows for direct access to the atom-like transitions of the donors. Such nano-structures are particularly applicable as solid-state single photon sources (SPS) and electron spin qubits. The quantum interference of single photons emitted from two independent ZnSe:F SPS revealed sufficient indistinguishability [1] for the realisation of all-optical concepts [2] of quantum-computation and -communication in a solid-state material. Furthermore the electron spin of the neutral donor can be used as a long-lived matter qubit [3]. Here we report on the post-selection of polarization entangled photon pairs emitted from two independent ZnSe:F SPS. The density matrix of the state was reconstructed by quantum state tomography and it yields a fidelity of 0.58 [4]. The results constitutes the first realization of two indistinguishable ZnSe:F SPS that can be used to generate substantial entanglement over macroscopic distances.
[1] K. Sanaka et al., Phys. Rev. Lett. 103(5), 053601 (2009). [2] J.L. O'Brien et al., Science 318(5856), 1567{1570 (2007). [3] A. Greilich et al., Phys. Rev. B 85(12), 121303R (2012). [4] K. Sanaka et al., Nano Letters 12, 4611 82012).