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Coherent Writing of the Dark Exciton State Using One Picosecond Long Optical Pulse

Ido Schwartz, Dan Cogan, Emma Schmidgall +3 more

We demonstrate a one to one correspondence between the polarization of a picosecond optical pulse and the coherent spin state of the long lived dark exciton that it deterministically photogenerates in a single quantum dot.

Jan 1, 20150 citations

Deterministic Writing and Control of the Dark Exciton State using Short Single Optical Pulses

Ido Schwartz, Emma Schmidgall, Liron Gantz +3 more

We experimentally demonstrate deterministic optical writing of a quantum dot-confined dark exciton, in a pure quantum state using one optical pulse. We then control the spin state of this long-lived exciton using picosecond optical pulses.

Jan 1, 20140 citations

Accessing the dark exciton spin in deterministic quantum-dot microlenses

Tobias Heindel, Alexander Thoma, Ido Schwartz +11 more

The dark exciton state in semiconductor quantum dots (QDs) constitutes a long-lived solid-state qubit which has the potential to play an important role in implementations of solid-state-based quantum information architectures. In this work, we exploit deterministically fabricated QD microlenses which promise enhanced photon extraction, to optically prepare and read out the dark exciton spin and observe its coherent precession. The optical access to the dark exciton is provided via spin-blockaded metastable biexciton states acting as heralding states, which are identified by deploying polarization-sensitive spectroscopy as well as time-resolved photon cross-correlation experiments. Our experiments reveal a spin-precession period of the dark exciton of (0.82 ± 0.01) ns corresponding to a fine-structure splitting of (5.0 ± 0.7) μeV between its eigenstates ↑⇑±↓⇓. By exploiting microlenses deterministically fabricated above pre-selected QDs, our work demonstrates the possibility to scale up implementations of quantum information processing schemes using the QD-confined dark exciton spin qubit, such as the generation of photonic cluster states or the realization of a solid-state-based quantum memory.The dark exciton state in semiconductor quantum dots (QDs) constitutes a long-lived solid-state qubit which has the potential to play an important role in implementations of solid-state-based quantum information architectures. In this work, we exploit deterministically fabricated QD microlenses which promise enhanced photon extraction, to optically prepare and read out the dark exciton spin and observe its coherent precession. The optical access to the dark exciton is provided via spin-blockaded metastable biexciton states acting as heralding states, which are identified by deploying polarization-sensitive spectroscopy as well as time-resolved photon cross-correlation experiments. Our experiments reveal a spin-precession period of the dark exciton of (0.82 ± 0.01) ns corresponding to a fine-structure splitting of (5.0 ± 0.7) μeV between its eigenstates ↑⇑±↓⇓. By exploiting microlenses deterministically fabricated above pre-selected QDs, our work demonstrates the possibility to scale up implementations of quantum information processing schemes using the QD-confined dark exciton spin qubit, such as the generation of photonic cluster states or the realization of a solid-state-based quantum memory.

arXiv:1706.05164APL PhotonicsDec 1, 201736 citations

Measuring the dark exciton in a quantum dot inside a planar microcavity using a bright state cycling transition

Markus A. Müller, Bin Cao, Glenn S. Solomon

We demonstrate the resonant excitation of a so-called dark exciton state in a quantum dot with a readout scheme based on the resonance fluorescence of the correlated bright exciton.

Conference on Lasers and Electro-OpticsJan 1, 20200 citations

Deterministic Writing and Control of the Dark Exciton Spin Using Single Short Optical Pulses

Ido Schwartz, Emma Schmidgall, L. Gantz +5 more

Quantum information processing relies on controlling electronic and nuclear spins. Scientists experimentally demonstrate that the spins of a certain kind of optical excitation have relatively long coherence lifetimes and, furthermore, can be reliably controlled.

arXiv:1408.2892Physical Review XJan 30, 201585 citations

Coherent writing and reading of quantum dots excitons' state by resonant two colors polarized laser pulses

Khatsevich, Kodriano, Tradonsky +4 more

Conference on Lasers and Electro-OpticsJan 1, 20100 citations

The Dark Exciton in a Quantum Dot- A Novel Bright Qubit with Very Long Coherence Time

Abstract

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The Dark Exciton in a Quantum Dot- A Novel Bright Qubit with Very Long Coherence Time

Abstract

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