Dark Bell states in tunnel-coupled spin qubits

Abstract

We investigate the dynamical purification of maximally entangled electron states by transport through coupled quantum dots. Under resonant ac driving and coherent tunneling, even-parity Bell states perform Rabi oscillations that decouple from the environment, leading to a dark state. The two electrons remain spatially separated, one in each quantum dot. We propose configurations where this effect will prove as antiresonances in transport spectroscopy experiments.

5 pages, 4 figures + supplementary information. Published version

References in corpus (11)

• Driven coherent oscillations of a single electron spin in a quantum dot
• Quantum States and Phases in Driven Open Quantum Systems with Cold Atoms
• Coherent control of a single electron spin with electric fields
• Electrically driven single electron spin resonance in a slanting Zeeman field
• Coherent electronic transfer in quantum dot systems using adiabatic passage
• Production and detection of entangled electron-hole pairs in a degenerate electron gas
• Hyperfine-mediated gate-driven electron spin resonance
• All-electronic coherent population trapping in quantum dots
• Parity meter for charge qubits: an efficient quantum entangler
• Parity detection and entanglement with a Mach-Zehnder interferometer
• Coherent spin rotations in open driven double quantum dots