Optical control of coherent interactions between quantum dot electron spins

Abstract

Coherent interactions between spins in quantum dots are a key requirement for quantum gates. We have performed pump-probe experiments in which pulsed lasers emitting at different photon energies manipulate two distinct subsets of electron spins within an inhomogeneous InGaAs quantum dot ensemble. The spin dynamics are monitored through their precession about an external magnetic field. These measurements demonstrate spin precession phase shifts and modulations of the magnitude of one subset of oriented spins after optical orientation of the second subset. The observations are consistent with results from a model using a Heisenberg-like interaction with microeV-strength.

5 pages, 4 figures

References in corpus (4)

• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Ultrafast optical control of entanglement between two quantum dot spins
• Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots
• Theory of fast optical spin rotation in a quantum dot based on geometric phases and trapped states

Cited by in corpus (9)

• Controlling Coherent Quantum Dot Interactions
• Spin-noise in the anisotropic central spin model
• Quantum model for mode locking in pulsed semiconductor quantum dots
• Non-equilibrium nuclear spin distribution function in quantum dots subject to periodic pulses
• Sensitivity of the decay of entanglement of quantum dot spin qubits to the magnetic field
• Unambiguous determination of spin dephasing times in ZnO
• Optical measurement of electron spins in quantum dots: Quantum Zeno effects
• Cross-correlation spectra in interacting quantum dot systems
• Signatures of long-range spin-spin interactions in an (In,Ga)As quantum dot ensemble