We investigate theoretically the generation of indistinguishable single photons from a strongly d... more We investigate theoretically the generation of indistinguishable single photons from a strongly dissipative quantum system placed inside an optical cavity. The degree of indistinguishability of photons emitted by the cavity is calculated as a function of the emitter-cavity coupling strength and the cavity linewidth. For a quantum emitter subject to strong pure dephasing, our calculations reveal that an unconventional regime of high indistinguishability can be reached for moderate emitter-cavity coupling strengths and high-quality factor cavities. In this regime, the broad spectrum of the dissipative quantum system is funneled into the narrow line shape of the cavity. The associated efficiency is found to greatly surpass spectral filtering effects. Our findings open the path towards on-chip scalable indistinguishable-photon-emitting devices operating at room temperature.
Confining a laser field between two high reflectivity mirrors of a high-finesse cavity can increa... more Confining a laser field between two high reflectivity mirrors of a high-finesse cavity can increase the probability of a given cavity photon to be scattered by an atom traversing the confined photon mode. This enhanced coupling between light and atoms is successfully employed in cavity quantum electrodynamics experiments and led to a very prolific research in quantum optics. The idea
ABSTRACT Room temperature solid-state quantum bit with second-long memory Realization of stable q... more ABSTRACT Room temperature solid-state quantum bit with second-long memory Realization of stable quantum bits (qubits) that can be prepared and measured with high fidelity and that are capable of storing quantum information for long times exceeding seconds is an outstanding challenge in quantum science and engineering. Here we report on the realization of such a stable quantum bit using an individual 13C nuclear spin within an isotopically purified diamond crystal at room temperature. Using an electronic spin associated with a nearby Nitrogen Vacancy color center, we demonstrate high fidelity initialization and readout of a single 13C qubit. Quantum memory lifetime exceeding one second is obtained by using controlled dissipative optical decoupling from the electronic degree of freedom. Techniques to further extend the quantum memory lifetime as well as the potential applications are also discussed.
ABSTRACT Robuste, langlebige Quantenspeicher sind unerlässlich für zukünftige Anwendungen der Qua... more ABSTRACT Robuste, langlebige Quantenspeicher sind unerlässlich für zukünftige Anwendungen der Quanteninformation, zum Beispiel für absolut betrugssichere Kreditkarten und fälschungssichere Ausweise. Allerdings stören bereits schwächste Umwelteinflüsse einen Quantenzustand und führen zu dessen schneller Zerstörung. Einen Quantenzustand in einem Diamantkristall für mehr als eine Sekunde bei Raumtemperatur zu speichern, gelang nun Wissenschaftlern an der Harvard Universität in Cambridge, des Max-Planck-Instituts für Quantenoptik in Garching und des Caltech in Pasadena. Durch weitere Optimierung lässt sich die Speicherdauer vermutlich noch signifikant erhöhen.
We report on recent progress in using the nitrogen-vacancy (NV) center in nanodiamonds as a local... more We report on recent progress in using the nitrogen-vacancy (NV) center in nanodiamonds as a local probe of paramagnetic free radical concentrations in living cells. The ability to monitor the local magnetic environment within the cell provides us a new tool to study ...
We investigate theoretically the generation of indistinguishable single photons from a strongly d... more We investigate theoretically the generation of indistinguishable single photons from a strongly dissipative quantum system placed inside an optical cavity. The degree of indistinguishability of photons emitted by the cavity is calculated as a function of the emitter-cavity coupling strength and the cavity linewidth. For a quantum emitter subject to strong pure dephasing, our calculations reveal that an unconventional regime of high indistinguishability can be reached for moderate emitter-cavity coupling strengths and high-quality factor cavities. In this regime, the broad spectrum of the dissipative quantum system is funneled into the narrow line shape of the cavity. The associated efficiency is found to greatly surpass spectral filtering effects. Our findings open the path towards on-chip scalable indistinguishable-photon-emitting devices operating at room temperature.
We report on recent progress of room-temperature electron spin sensing for biological application... more We report on recent progress of room-temperature electron spin sensing for biological applications using nitrogen-vacancy (NV) centers in diamond. Our approach involves room-temperature detection of a small number of electron spins, situated outside the ...
Frontiers in Optics 2011/Laser Science XXVII, 2011
ABSTRACT An optical lattice formed by reflection from a SiN$_x$ membrane creates a bi-directional... more ABSTRACT An optical lattice formed by reflection from a SiN$_x$ membrane creates a bi-directional coupling of atomic and membrane motion. Experimental demonstrations of both direct-action and backaction in this system are reported.
Conference on Lasers and Electro-Optics 2012, 2012
ABSTRACT An optical lattice formed by reflection from a SiNx membrane creates a bidirectional cou... more ABSTRACT An optical lattice formed by reflection from a SiNx membrane creates a bidirectional coupling of atomic and membrane motion. We measure the influence of the atoms on the membrane and explore causes of mechanical dissipation.
We investigate theoretically the generation of indistinguishable single photons from a strongly d... more We investigate theoretically the generation of indistinguishable single photons from a strongly dissipative quantum system placed inside an optical cavity. The degree of indistinguishability of photons emitted by the cavity is calculated as a function of the emitter-cavity coupling strength and the cavity linewidth. For a quantum emitter subject to strong pure dephasing, our calculations reveal that an unconventional regime of high indistinguishability can be reached for moderate emitter-cavity coupling strengths and high-quality factor cavities. In this regime, the broad spectrum of the dissipative quantum system is funneled into the narrow line shape of the cavity. The associated efficiency is found to greatly surpass spectral filtering effects. Our findings open the path towards on-chip scalable indistinguishable-photon-emitting devices operating at room temperature.
Confining a laser field between two high reflectivity mirrors of a high-finesse cavity can increa... more Confining a laser field between two high reflectivity mirrors of a high-finesse cavity can increase the probability of a given cavity photon to be scattered by an atom traversing the confined photon mode. This enhanced coupling between light and atoms is successfully employed in cavity quantum electrodynamics experiments and led to a very prolific research in quantum optics. The idea
ABSTRACT Room temperature solid-state quantum bit with second-long memory Realization of stable q... more ABSTRACT Room temperature solid-state quantum bit with second-long memory Realization of stable quantum bits (qubits) that can be prepared and measured with high fidelity and that are capable of storing quantum information for long times exceeding seconds is an outstanding challenge in quantum science and engineering. Here we report on the realization of such a stable quantum bit using an individual 13C nuclear spin within an isotopically purified diamond crystal at room temperature. Using an electronic spin associated with a nearby Nitrogen Vacancy color center, we demonstrate high fidelity initialization and readout of a single 13C qubit. Quantum memory lifetime exceeding one second is obtained by using controlled dissipative optical decoupling from the electronic degree of freedom. Techniques to further extend the quantum memory lifetime as well as the potential applications are also discussed.
ABSTRACT Robuste, langlebige Quantenspeicher sind unerlässlich für zukünftige Anwendungen der Qua... more ABSTRACT Robuste, langlebige Quantenspeicher sind unerlässlich für zukünftige Anwendungen der Quanteninformation, zum Beispiel für absolut betrugssichere Kreditkarten und fälschungssichere Ausweise. Allerdings stören bereits schwächste Umwelteinflüsse einen Quantenzustand und führen zu dessen schneller Zerstörung. Einen Quantenzustand in einem Diamantkristall für mehr als eine Sekunde bei Raumtemperatur zu speichern, gelang nun Wissenschaftlern an der Harvard Universität in Cambridge, des Max-Planck-Instituts für Quantenoptik in Garching und des Caltech in Pasadena. Durch weitere Optimierung lässt sich die Speicherdauer vermutlich noch signifikant erhöhen.
We report on recent progress in using the nitrogen-vacancy (NV) center in nanodiamonds as a local... more We report on recent progress in using the nitrogen-vacancy (NV) center in nanodiamonds as a local probe of paramagnetic free radical concentrations in living cells. The ability to monitor the local magnetic environment within the cell provides us a new tool to study ...
We investigate theoretically the generation of indistinguishable single photons from a strongly d... more We investigate theoretically the generation of indistinguishable single photons from a strongly dissipative quantum system placed inside an optical cavity. The degree of indistinguishability of photons emitted by the cavity is calculated as a function of the emitter-cavity coupling strength and the cavity linewidth. For a quantum emitter subject to strong pure dephasing, our calculations reveal that an unconventional regime of high indistinguishability can be reached for moderate emitter-cavity coupling strengths and high-quality factor cavities. In this regime, the broad spectrum of the dissipative quantum system is funneled into the narrow line shape of the cavity. The associated efficiency is found to greatly surpass spectral filtering effects. Our findings open the path towards on-chip scalable indistinguishable-photon-emitting devices operating at room temperature.
We report on recent progress of room-temperature electron spin sensing for biological application... more We report on recent progress of room-temperature electron spin sensing for biological applications using nitrogen-vacancy (NV) centers in diamond. Our approach involves room-temperature detection of a small number of electron spins, situated outside the ...
Frontiers in Optics 2011/Laser Science XXVII, 2011
ABSTRACT An optical lattice formed by reflection from a SiN$_x$ membrane creates a bi-directional... more ABSTRACT An optical lattice formed by reflection from a SiN$_x$ membrane creates a bi-directional coupling of atomic and membrane motion. Experimental demonstrations of both direct-action and backaction in this system are reported.
Conference on Lasers and Electro-Optics 2012, 2012
ABSTRACT An optical lattice formed by reflection from a SiNx membrane creates a bidirectional cou... more ABSTRACT An optical lattice formed by reflection from a SiNx membrane creates a bidirectional coupling of atomic and membrane motion. We measure the influence of the atoms on the membrane and explore causes of mechanical dissipation.
Uploads