Persistent narrowing of nuclear-spin fluctuations in InAs quantum dots using laser excitation

Abstract

We demonstrate the suppression of nuclear spin fluctuations in an InAs quantum dot and measure the timescales of the spin narrowing effect. By initializing for tens of milliseconds with two continuous wave diode lasers, fluctuations of the nuclear spins are suppressed via the hole assisted dynamic nuclear polarization feedback mechanism. The fluctuation narrowed state persists in the dark (absent light illumination) for well over one second even in the presence of a varying electron charge and spin polarization. Enhancement of the electron spin coherence time (T2*) is directly measured using coherent dark state spectroscopy. By separating the calming of the nuclear spins in time from the spin qubit operations, this method is much simpler than the spin echo coherence recovery or dynamic decoupling schemes.

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Cited by in corpus (19)

• Quantum feedback: theory, experiments, and applications
• Quantum control of a spin qubit coupled to a photonic crystal cavity
• Quantum many-body theory for electron spin decoherence in nanoscale nuclear spin baths
• Measurement of the spin temperature of optically cooled nuclei and GaAs hyperfine constants in GaAs/AlGaAs quantum dots
• Improving a solid-state qubit through an engineered mesoscopic environment
• Witnessing quantum correlations in a nuclear ensemble via an electron spin qubit
• General theory of feedback control of a nuclear spin ensemble in quantum dots
• Quantum model for mode locking in pulsed semiconductor quantum dots
• Non-local nuclear spin quieting in quantum dot molecules: Optically-induced extended two-electron spin coherence time
• Preparation of Non-equilibrium Nuclear Spin States in Double Quantum Dots
• Universal nuclear focusing of confined electron spins
• Nuclear spin squeezing via electric quadrupole interaction
• Strongly polarizing weakly coupled ${}^{13}$C nuclear spins with optically pumped nitrogen-vacancy center
• Nuclear spin polarization in a single quantum dot pumped by two laser beams
• Inhomogeneous dynamic nuclear polarization and suppression of electron-polarization decay in a quantum dot
• Fidelity of optically induced single-spin rotations in semiconductor quantum dots in the presence of nuclear spins
• Passive stabilization of hole spin qubit using optical Stark effect
• Direct high resolution resonant Raman scattering measurements of InAs quantum dot dynamic nuclear spin polarization states
• Hybrid acousto-optical spin control in quantum dots