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

Understand

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.