Optical control of one and two hole spins in interacting quantum dots

Abstract

A single hole spin in a semiconductor quantum dot has emerged as a quantum bit that is potentially superior to an electron spin. A key feature of holes is that they have a greatly reduced hyperfine interaction with nuclear spins, which is one of the biggest difficulties in working with an electron spin. It is now essential to show that holes are viable for quantum information processing by demonstrating fast quantum gates and scalability. To this end we have developed InAs/GaAs quantum dots coupled through coherent tunneling and charged with controlled numbers of holes. We report fast, single qubit gates using a sequence of short laser pulses. We then take the important next step toward scalability of quantum information by optically controlling two interacting hole spins in separate dots.

5 figures

References in corpus (14)

• Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
• Ultrafast optical control of entanglement between two quantum dot spins
• Coherent control and suppressed nuclear feedback of a single quantum dot hole qubit
• Observation of extremely slow hole spin relaxation in self-assembled quantum dots
• Generation and transfer of single photons on a photonic crystal chip
• Hole - Nuclear Spin Interaction in Quantum Dots
• Electrically tunable g-factors in quantum dot molecular spin states
• Coherent optical control of the spin of a single hole in a quantum dot
• Optically Probing Spin and Charge Interactions in an Tunable Artificial Molecule
• Direct measurement of the hole-nuclear spin interaction in single quantum dots
• Hybridization and spin decoherence in heavy-hole quantum dots
• Pulsed Nuclear Pumping and Spin Diffusion in a Single Charged Quantum Dot
• Optically induced spin gates in coupled quantum dots using the electron-hole exchange interaction
• Optical Spin Initialization and Non-Destructive Measurement in a Quantum Dot Molecule

Cited by in corpus (88)

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• Electrically-tunable hole g-factor of an optically-active quantum dot for fast spin rotations
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• Theory of optical spin control in quantum dot microcavities
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