Optical detection of quantum entanglement between two quantum dots near a metal nanoparticle

We theoretically study the interaction between two semiconductor quantum dots (SQDs) and a metal nanoparticle (MNP) within the quantum description. The plasmon field produced in the MNP excited by the external field can play the platform of Forster energy transfer between two SQDs which gives rise to the generation of entangled states. The Fano effect can be shown in the energy absorption spectrum of MNP, which originates from constructive or destructive interference between two competing optical pathways. Since the generated entangled state is in one pathway, the steady-state concurrence of entanglement can be evaluated by the observation of Fano profile. Because the concurrence of two SQDs is determined by both the pump intensity and the energy difference, one can properly choose these two parameters for detecting the non-negligible entanglement. When the pump intensity is very strong, there is no entanglement. The method to observe entanglement with the Fano profile, so, has a limited range of applicability. The optical observation is a novel approach to reveal entanglement. It may be used to optically detect quantum entanglement in many solid-state systems.

[1]  U. Hohenester,et al.  Interaction of Single Molecules With Metallic Nanoparticles , 2008, IEEE Journal of Selected Topics in Quantum Electronics.

[2]  Tolga Atay,et al.  Large enhancement of fluorescence efficiency from CdSe/ZnS quantum dots induced by resonant coupling to spatially controlled surface plasmons. , 2005, Nano letters.

[3]  Ulrich Hohenester,et al.  Strong coupling between a metallic nanoparticle and a single molecule , 2008, 0802.1630.

[4]  Wei Zhang,et al.  Semiconductor-metal nanoparticle molecules: hybrid excitons and the nonlinear fano effect. , 2006, Physical review letters.

[5]  I. Chuang,et al.  Quantum Computation and Quantum Information: Introduction to the Tenth Anniversary Edition , 2010 .

[6]  Guang-Can Guo,et al.  Quantum bus of metal nanoring with surface plasmon polaritons , 2009 .

[7]  Nicholas A. Kotov,et al.  Theory of plasmon-enhanced Förster energy transfer in optically excited semiconductor and metal nanoparticles , 2007 .

[8]  Wei Zhang,et al.  Quantum theory of the nonlinear Fano effect in hybrid metal-semiconductor nanostructures: The case of strong nonlinearity , 2011 .

[9]  G. Guo,et al.  Efficient scheme for two-atom entanglement and quantum information processing in cavity QED , 2000, Physical review letters.

[10]  M. Lewenstein,et al.  Quantum Entanglement , 2020, Quantum Mechanics.

[11]  L Martin-Moreno,et al.  Entanglement of two qubits mediated by one-dimensional plasmonic waveguides. , 2010, Physical review letters.

[12]  A. Badolato,et al.  The nonlinear Fano effect , 2008, Nature.

[13]  Peter Lodahl,et al.  Strongly modified plasmon-matter interaction with mesoscopic quantum emitters , 2010, 1011.5669.

[14]  Naomi J Halas,et al.  Plexciton dynamics: exciton-plasmon coupling in a J-aggregate-Au nanoshell complex provides a mechanism for nonlinearity. , 2011, Nano letters.

[15]  Jaebeom Lee,et al.  Exciton-plasmon interactions in molecular spring assemblies of nanowires and wavelength-based protein detection. , 2007, Nature materials.

[16]  Charles H. Bennett,et al.  Communication via one- and two-particle operators on Einstein-Podolsky-Rosen states. , 1992, Physical review letters.

[17]  E. Moreno,et al.  Dissipation-driven generation of two-qubit entanglement mediated by plasmonic waveguides , 2011 .

[18]  Igor L. Medintz,et al.  Spectrally resolved energy transfer using quantum dot donors: Ensemble and single-molecule photoluminescence studies , 2006 .

[19]  Yoshihiko Kanemitsu,et al.  Energy transfer in mixed CdSe and Au nanoparticle monolayers studied by simultaneous photoluminescence and Raman spectral measurements , 2008 .

[20]  Garnett W. Bryant,et al.  Strongly coupled quantum dot-metal nanoparticle systems: Exciton-induced transparency, discontinuous response, and suppression as driven quantum oscillator effects , 2010 .

[21]  Ka-Di Zhu,et al.  Strong coupling among semiconductor quantum dots induced by a metal nanoparticle , 2012, Nanoscale Research Letters.

[22]  W. Wootters.  Entanglement of Formation of an Arbitrary State of Two Qubits , 1997, quant-ph/9709029.

[23]  M. Fleischhauer,et al.  Quantum emitters coupled to surface plasmons of a nanowire: A Green's function approach , 2010, 1002.1419.

[24]  G. Tóth,et al.  Experimental observation of four-photon entangled Dicke state with high fidelity. , 2006, Physical review letters.

[25]  M. Lukin,et al.  Generation of single optical plasmons in metallic nanowires coupled to quantum dots , 2007, Nature.

[26]  Tianyu Yang,et al.  Radiative rate enhancements in ensembles of hybrid metal-semiconductor nanostructures. , 2009, Physical review letters.

[27]  H. Weinfurter,et al.  Observation of entanglement of a single photon with a trapped atom. , 2006, Physical review letters.

[28]  Yuri S. Kivshar,et al.  Fano Resonances in Nanoscale Structures , 2010 .

[29]  D Richter,et al.  Direct observation of confined single chain dynamics by neutron scattering. , 2010, Physical review letters.

[30]  F. D. Abajo,et al.  Optical excitations in electron microscopy , 2009, 0903.1669.