Quantum coherence from commensurate driving with laser pulses and decay

@article{Uhrig2020QuantumCF,
  title={Quantum coherence from commensurate driving with laser pulses and decay},
  author={G. S. Uhrig},
  journal={SciPost Physics},
  year={2020}
}
  • G. Uhrig
  • Published 6 June 2019
  • Physics
  • SciPost Physics
Non-equilibrium physics is a particularly fascinating field of current research. Generically, driven systems are gradually heated up so that quantum effects die out. In contrast, we show that a driven central spin model including controlled dissipation in a highly excited state allows us to distill quantum coherent states, indicated by a substantial reduction of entropy; the key resource is the commensurability between the periodicity of the pump pulses and the internal processes. The model is… 

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References

SHOWING 1-10 OF 38 REFERENCES

Robust manipulation of electron spin coherence in an ensemble of singly charged quantum dots

Using the recently reported mode locking effect we demonstrate a highly robust control of electron spin coherence in an ensemble of (In,Ga)As quantum dots during the single spin coherence time. The

Theory of dynamic nuclear polarization and feedback in quantum dots

An electron confined in a quantum dot interacts with its local nuclear spin environment through the hyperfine contact interaction. This interaction combined with external control and relaxation or

Quantum model for mode locking in pulsed semiconductor quantum dots

Quantum dots in GaAs/InGaAs structures have been proposed as a candidate system for realizing quantum computing. The short coherence time of the electronic quantum state that arises from coupling to

Nonequilibrium nuclear spin distribution function in quantum dots subject to periodic pulses

Electron spin dephasing in a singly charged semiconductor quantum dot can partially be suppressed by periodic laser pulsing. We propose a semi-classical approach describing the decoherence of the

Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots.

TLDR
Electron spin coherence has been generated optically in n-type modulation doped (In,Ga)As/GaAs quantum dots (QDs) which contain on average a single electron per dot, and can be controlled by pulse intensity.

Nuclear frequency focusing in periodically pulsed semiconductor quantum dots described by infinite classical central spin models

The coherence of an electronic spin in a semiconductor quantum dot decays due to its interaction with the bath of nuclear spins in the surrounding isotopes. This effect can be reduced by subjecting

Entanglement generated by dissipation and steady state entanglement of two macroscopic objects.

TLDR
An experiment where dissipation continuously generates entanglement between two macroscopic objects is reported on, achieved by engineering the dissipation using laser and magnetic fields and leading to robust event-readyEntanglement maintained for 0.04 s at room temperature.

Dissipation induced coherence of a two-mode Bose-Einstein condensate.

TLDR
The phase coherence of a weakly interacting condensate as well as the response to an external driving show a pronounced stochastic resonance effect: Both quantities become maximal for a finite value of the dissipation rate matching the intrinsic time scales of the system.

Magnetic field dependence of the electron spin revival amplitude in periodically pulsed quantum dots

Periodic laser pulsing of singly charged semiconductor quantum dots in an external magnetic field leads to a synchronization of the spin dynamics with the optical excitation. The pumped electron

Dissipative production of a maximally entangled steady state of two quantum bits

TLDR
The demonstration of an entangled steady state of two qubits represents a step towards dissipative state engineering, dissipative quantum computation and dissipative phase transitions and engineered coupling to the environment may be applied to a broad range of experimental systems to achieve desired quantum dynamics or steady states.