Strongly coupled quantum dot-cavity systems provide a non-linear configuration of hybridized light-matter states with promising quantum-optical applications. Here, we investigate the coherent interaction between strong laser pulses and quantum dot-cavity polaritons. Resonant excitation of polaritonic states and their interaction with phonons allow us to observe coherent Rabi oscillations and Ramsey fringes. Furthermore, we demonstrate complete coherent control of a quantum dot-photonic crystal cavity based quantum-bit. By controlling the excitation power and phase in a two-pulse excitation scheme we achieve access to the full Bloch sphere. Quantum-optical simulations are in good agreement with our experiments and provide insight into the decoherence mechanisms.Strongly coupled quantum dot-cavity systems provide a non-linear configuration of hybridized light-matter states with promising quantum-optical applications. Here, we investigate the coherent interaction between strong laser pulses and quantum dot-cavity polaritons. Resonant excitation of polaritonic states and their interaction with phonons allow us to observe coherent Rabi oscillations and Ramsey fringes. Furthermore, we demonstrate complete coherent control of a quantum dot-photonic crystal cavity based quantum-bit. By controlling the excitation power and phase in a two-pulse excitation scheme we achieve access to the full Bloch sphere. Quantum-optical simulations are in good agreement with our experiments and provide insight into the decoherence mechanisms.

Apr 26, 201642 citations

Strong coupling in a single quantum dot–semiconductor microcavity system

Johann Peter Reithmaier, Grzegorz Sek, A. Löffler +7 more

NatureNov 1, 20042,063 citations

Complete Coherent Control of a Quantum Dot Strongly Coupled to a Nanocavity

Constantin Dory, Kevin A. Fischer, Kai Müller +6 more

arXiv:1512.05952Scientific ReportsApr 26, 201648 citations

Nonclassical higher-order photon correlations with a quantum dot strongly coupled to a photonic-crystal nanocavity

Armand Rundquist, Michal Bajcsy, Arka Majumdar +6 more

We use the third- and fourth-order autocorrelation functions ${g}^{(3)}({\ensuremath{\tau}}_{1},{\ensuremath{\tau}}_{2})$ and ${g}^{(4)}({\ensuremath{\tau}}_{1},{\ensuremath{\tau}}_{2},{\ensuremath{\tau}}_{3})$ to detect the nonclassical character of the light transmitted through a photonic-crystal nanocavity containing a strongly coupled quantum dot probed with a train of coherent light pulses. We contrast the value of ${g}^{(3)}(0,0)$ with the conventionally used ${g}^{(2)}(0)$ and demonstrate that, in addition to being necessary for detecting two-photon states emitted by a low-intensity source, ${g}^{(3)}$ provides a more clear indication of the nonclassical character of a light source. We also present preliminary data that demonstrates bunching in the fourth-order autocorrelation function ${g}^{(4)}({\ensuremath{\tau}}_{1},{\ensuremath{\tau}}_{2},{\ensuremath{\tau}}_{3})$ as the first step toward detecting three-photon states.We use the third- and fourth-order autocorrelation functions ${g}^{(3)}({\ensuremath{\tau}}_{1},{\ensuremath{\tau}}_{2})$ and ${g}^{(4)}({\ensuremath{\tau}}_{1},{\ensuremath{\tau}}_{2},{\ensuremath{\tau}}_{3})$ to detect the nonclassical character of the light transmitted through a photonic-crystal nanocavity containing a strongly coupled quantum dot probed with a train of coherent light pulses. We contrast the value of ${g}^{(3)}(0,0)$ with the conventionally used ${g}^{(2)}(0)$ and demonstrate that, in addition to being necessary for detecting two-photon states emitted by a low-intensity source, ${g}^{(3)}$ provides a more clear indication of the nonclassical character of a light source. We also present preliminary data that demonstrates bunching in the fourth-order autocorrelation function ${g}^{(4)}({\ensuremath{\tau}}_{1},{\ensuremath{\tau}}_{2},{\ensuremath{\tau}}_{3})$ as the first step toward detecting three-photon states.

arXiv:1307.3601Physical Review AAug 25, 201486 citations

{g}^{(3)}(0,0)

with the conventionally used

{g}^{(2)}(0)

and demonstrate that, in addition to being necessary for detecting two-photon states emitted by a low-intensity source,

{g}^{(3)}

provides a more clear indication of the nonclassical character of a light source. We also present preliminary data that demonstrates bunching in the fourth-order autocorrelation function ${g}^{(4)}({\ensuremath{\tau}}_{1},{\ensuremath{\tau}}_{2},{\ensuremath{\tau}}_{3})$ as the first step toward detecting three-photon states.