aqora

Two-Photon Coherent Spin Flip and Polarization Rotation of Excitons in Quantum Dots

Paweł Machnikowski

Journal of Superconductivity and Novel MagnetismSep 30, 20090 citations

Coherent Writing and Reading of Quantum Dot Exciton State by Resonant Two Colors Polarized Laser Pulses

S. Khatsevich, Yaron Kodriano, Chene Tradonsky +4 more

We use a resonant circularly polarized picosecond laser pulse to write a coherent superposition of exciton's states. We use a second, delayed circularly polarized pulse, tuned into the biexciton resonance to read the exciton's state.

Conference on Lasers and Electro-OpticsJan 1, 20100 citations

Laser spectroscopy of coherent quantum states in single quantum dots

Daniel Brunner

Apr 1, 20101 citation

Coherent Optical Writing and Reading of the Exciton Spin State in Single Quantum Dots

Yael Benny, S. Khatsevich, Yaron Kodriano +5 more

We demonstrate a one-to-one correspondence between the polarization state of a light pulse tuned to neutral exciton resonances of single semiconductor quantum dots and the spin state of the exciton that it photogenerates. This is accomplished using two variably polarized and independently tuned picosecond laser pulses. The first "writes" the spin state of the resonantly excited exciton. The second is tuned to biexcitonic resonances, and its absorption is used to "read" the exciton spin state. The absorption of the second pulse depends on its polarization relative to the exciton spin direction. Changes in the exciton spin result in corresponding changes in the intensity of the photoluminescence from the biexciton lines which we monitor, obtaining thus a one-to-one mapping between any point on the Poincaré sphere of the light polarization to a point on the Bloch sphere of the exciton spin.We demonstrate a one-to-one correspondence between the polarization state of a light pulse tuned to neutral exciton resonances of single semiconductor quantum dots and the spin state of the exciton that it photogenerates. This is accomplished using two variably polarized and independently tuned picosecond laser pulses. The first "writes" the spin state of the resonantly excited exciton. The second is tuned to biexcitonic resonances, and its absorption is used to "read" the exciton spin state. The absorption of the second pulse depends on its polarization relative to the exciton spin direction. Changes in the exciton spin result in corresponding changes in the intensity of the photoluminescence from the biexciton lines which we monitor, obtaining thus a one-to-one mapping between any point on the Poincaré sphere of the light polarization to a point on the Bloch sphere of the exciton spin.

arXiv:1009.5463Physical Review LettersJan 25, 201152 citations

Deterministic coherent writing of a long-lived semiconductor spin qubit using one ultrafast optical pulse

Ido Schwartz, Dan Cogan, Emma Schmidgall +4 more

We use one single, few-picosecond-long, variably polarized laser pulse to deterministically write any selected spin state of a quantum dot confined dark exciton whose life and coherence time are six and five orders of magnitude longer than the laser pulse duration, respectively. The pulse is tuned to an absorption resonance of an excited dark exciton state, which acquires nonnegligible oscillator strength due to residual mixing with bright exciton states. We obtain a high-fidelity one-to-one mapping from any point on the Poincar\'e sphere of the pulse polarization to a corresponding point on the Bloch sphere of the spin of the deterministically photogenerated dark exciton.We use one single, few-picosecond-long, variably polarized laser pulse to deterministically write any selected spin state of a quantum dot confined dark exciton whose life and coherence time are six and five orders of magnitude longer than the laser pulse duration, respectively. The pulse is tuned to an absorption resonance of an excited dark exciton state, which acquires nonnegligible oscillator strength due to residual mixing with bright exciton states. We obtain a high-fidelity one-to-one mapping from any point on the Poincar\'e sphere of the pulse polarization to a corresponding point on the Bloch sphere of the spin of the deterministically photogenerated dark exciton.

arXiv:1507.06437Physical Review BNov 9, 201524 citations

Optical nonlinearity by exciton-biexciton coherent effects in quantum dots

Hideki Gotoh, Hidehiko Kamada, T. Saitoh +2 more

Conference on Lasers and Electro-OpticsJan 1, 20050 citations

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

Related papers

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

Related papers