A valley-spin qubit in a carbon nanotube

Abstract

Although electron spins in III-V semiconductor quantum dots have shown great promise as qubits, a major challenge is the unavoidable hyperfine decoherence in these materials. In group IV semiconductors, the dominant nuclear species are spinless, allowing for qubit coherence times that have been extended up to seconds in diamond and silicon. Carbon nanotubes are a particularly attractive host material, because the spin-orbit interaction with the valley degree of freedom allows for electrical manipulation of the qubit. In this work, we realise such a qubit in a nanotube double quantum dot. The qubit is encoded in two valley-spin states, with coherent manipulation via electrically driven spin resonance (EDSR) mediated by a bend in the nanotube. Readout is performed by measuring the current in Pauli blockade. Arbitrary qubit rotations are demonstrated, and the coherence time is measured via Hahn echo. Although the measured decoherence time is only 65 ns in our current device, this work offers the possibility of creating a qubit for which hyperfine interaction can be virtually eliminated.

References in corpus (12)

• Coherent control of a single electron spin with electric fields
• A single-atom electron spin qubit in silicon
• Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Spin-orbit interaction and anomalous spin relaxation in carbon nanotube quantum dots
• Tunable few-electron double quantum dots and Klein tunnelling in ultra-clean carbon nanotubes
• Valley-spin blockade and spin resonance in carbon nanotubes
• Universal phase shift and non-exponential decay of driven single-spin oscillations
• Bends In Nanotubes Allow Electric Spin Control and Coupling
• Spin-orbit interaction in chiral carbon nanotubes probed in pulsed magnetic fields
• Few-electron physics in a nanotube quantum dot with spin-orbit coupling
• Resonant harmonic generation and collective spin rotations in electrically driven quantum dots

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