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Optical nonlinearities enable photon-photon interaction and lie at the heart of several proposals for quantum information processing, quantum nondemolition measurements of photons, and optical signal processing. To date, the largest nonlinearities have been realized with single atoms and atomic ensembles. We show that a single quantum dot coupled to a… (More)

- Brian D Gerardot, Daniel Brunner, Paul A Dalgarno, Patrik Ohberg, Stefan Seidl, Martin Kroner +4 others
- Nature
- 2008

The spin of an electron is a natural two-level system for realizing a quantum bit in the solid state. For an electron trapped in a semiconductor quantum dot, strong quantum confinement highly suppresses the detrimental effect of phonon-related spin relaxation. However, this advantage is offset by the hyperfine interaction between the electron spin and the… (More)

Solid-state cavity quantum electrodynamics (QED) systems offer a robust and scalable platform for quantum optics experiments and the development of quantum information processing devices. In particular, systems based on photonic crystal nanocavities and semiconductor quantum dots have seen rapid progress. Recent experiments have allowed the observation of… (More)

Most schemes for quantum information processing require fast single-qubit operations. For spin-based qubits, this involves performing arbitrary coherent rotations of the spin state on time scales much faster than the spin coherence time. By applying off-resonant, picosecond-scale optical pulses, we demonstrated the coherent rotation of a single electron… (More)

Quantum dots in photonic crystals are interesting because of their potential in quantum information processing 1,2 and as a testbed for cavity quantum electrodynamics. Recent advances in controlling 3,4 and coherent probing 5,6 of such systems open the possibility of realizing quantum networks originally proposed for atomic systems 7–9. Here, we demonstrate… (More)

Kerr rotation measurements on a single electron spin confined in a charge-tunable semiconductor quantum dot demonstrate a means to directly probe the spin off-resonance, thus minimally disturbing the system. Energy-resolved magneto-optical spectra reveal information about the optically oriented spin polarization and the transverse spin lifetime of the… (More)

Optoelectronic devices that provide non-classical light states on demand have a broad range of applications in quantum information science 1 , including quantum-key-distribution systems 2 , quantum lithography 3 and quantum computing 4. Single-photon sources 5,6 in particular have been demonstrated to outperform key distribution based on attenuated… (More)

Quantum networks based on InAs quantum dots embedded in photonic crystal devices rely on quantum dots being in resonance with each other and with the cavities they are embedded in. The authors developed a technique based on temperature tuning to spectrally align different quantum dots located on the same chip. The technique allows for up to 1.8 nm… (More)

- Daniel Brunner, Brian D Gerardot, Paul A Dalgarno, Gunter Wüst, Khaled Karrai, Nick G Stoltz +2 others
- Science
- 2009

Semiconductors have uniquely attractive properties for electronics and photonics. However, it has been difficult to find a highly coherent quantum state in a semiconductor for applications in quantum sensing and quantum information processing. We report coherent population trapping, an optical quantum interference effect, on a single hole. The results… (More)

- Andrei Faraon, Dirk Englund, Douglas Bulla, Barry Luther-Davies, Benjamin J. Eggleton, Nick Stoltz +2 others
- 2008

We demonstrate a method to locally change the refractive index in planar optical devices by photodarkening of a thin chalcogenide glass layer deposited on top of the device. The method is used to tune the resonance of GaAs-based photonic crystal cavities by up to 3 nm at 940 nm. The method has broad applications for postproduction tuning of photonic… (More)