Photon-assisted tunneling and charge dephasing in a carbon nanotube double quantum dot

Abstract

We report microwave-driven photon-assisted tunneling in a suspended carbon nanotube double quantum dot. From the resonant linewidth at a temperature of 13 mK, the charge dephasing time is determined to be 280 +- 30 ps. The linewidth is independent of driving frequency, but increases with increasing temperature. The moderate temperature dependence is inconsistent with expectations from electron-phonon coupling alone, but consistent with charge noise arising in the device. The extracted level of charge noise is comparable with that expected from previous measurements of a valley-spin qubit, where it was hypothesized to be the main cause of qubit decoherence. Our results suggest a possible route towards improved valley-spin qubits.

References in corpus (28)

• QuTiP 2: A Python framework for the dynamics of open quantum systems
• Electron transport through double quantum dots
• Experimental issues in coherent quantum-state manipulation of trapped atomic ions
• A tunable carbon nanotube electromechanical oscillator
• Coherent manipulation of electronic states in a double quantum dot
• Phonon-induced decay of the electron spin in quantum dots
• Coherent and Collective Quantum Optical Effects in Mesoscopic Systems
• Manipulation of a single charge in a double quantum dot
• Quantum transport in carbon nanotubes
• Dipole coupling of a double quantum dot to a microwave resonator
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Time-dependent resonant tunneling via two discrete states
• Carbon Nanotubes as Nanoelectromechanical Systems
• Coherent coupling of a single spin to microwave cavity photons
• A valley-spin qubit in a carbon nanotube
• Relaxation and Dephasing in a Two-electron 13C Nanotube Double Quantum Dot
• Spin-orbit interaction and anomalous spin relaxation in carbon nanotube quantum dots
• Valley-spin blockade and spin resonance in carbon nanotubes
• Spin-orbit-induced strong coupling of a single spin to a nanomechanical resonator
• Bends In Nanotubes Allow Electric Spin Control and Coupling
• Out of equilibrium charge dynamics in a hybrid cQED architecture
• Spin relaxation due to deflection coupling in nanotube quantum dots
• Disorder-mediated electron valley resonance in carbon nanotube quantum dots
• Clean carbon nanotubes coupled to superconducting impedance-matching circuits
• Printed Circuit Board Metal Powder Filters for Low Electron Temperatures
• Readout of carbon nanotube vibrations based on spin-phonon coupling
• Quantum dynamics in a tiered non-Markovian environment
• Electrically driven spin resonance in a bent disordered carbon nanotube

Cited by in corpus (11)

• Nonadiabatic Landau-Zener-Stückelberg-Majorana transitions, dynamics, and interference
• Resonant optomechanics with a vibrating carbon nanotube and a radio-frequency cavity
• Vibrational effects in charge transport through a molecular double quantum dot
• Radio-frequency reflectometry of a quantum dot using an ultra-low-noise SQUID amplifier
• Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube
• Coherent Charge Oscillations in a Bilayer Graphene Double Quantum Dot
• Measuring carbon nanotube vibrations using a single-electron transistor as a fast linear amplifier
• Spin-valley resolved photon-assisted tunneling in carbon nanotube double quantum dots
• Spin-valley dynamics of electrically driven ambipolar carbon-nanotube quantum dots
• Quantum circuit refrigerator based on quantum dots coupled to normal-metal and superconducting electrodes
• Spin separation and exchange for quantum dots in the Overhauser field