Quantum capacitance mediated carbon nanotube optomechanics

Abstract

Cavity optomechanics allows the characterization of a vibration mode, its cooling and quantum manipulation using electromagnetic fields. Regarding nanomechanical as well as electronic properties, single wall carbon nanotubes are a prototypical experimental system. At cryogenic temperatures, as high quality factor vibrational resonators, they display strong interaction between motion and single-electron tunneling. Here, we demonstrate large optomechanical coupling of a suspended carbon nanotube quantum dot and a microwave cavity, amplified by several orders of magnitude via the nonlinearity of Coulomb blockade. From an optomechanically induced transparency (OMIT) experiment, we obtain a single photon coupling of up to g 0 = 2π ⋅ 95 Hz. This indicates that normal mode splitting and full optomechanical control of the carbon nanotube vibration in the quantum limit is reachable in the near future. Mechanical manipulation and characterization via the microwave field can be complemented by the manifold physics of quantum-confined single electron devices.

Proposal for a nanomechanical qubit

“…Fig. 1) similar to those demonstrated by a number of groups [16][17][18][19]. It has been shown that it is possible to use multiples gates to fine-tune the electrostatic potential along the suspended part of the nanotube [17,20,21].…”

Resonator induced quantum phase transitions in a hybrid Josephson junction

“…[38][39][40] In combination with superconducting leads, this may enable the design of novel quantum states of matter. 41,42 CNT devices [43][44][45][46][47][48] are characterized by their small masses and qualify, likewise, as conductors and nanoresonators with high quality factors. [49][50][51] They have potential applications in lasing [52][53][54][55] and serve in the ultra-sensitive detection of masses, 56,57 charge densities, 58 magnetic moments, [59][60][61] and terahertz frequencies.…”

Phonon-induced pairing in quantum dot quantum simulator

“…Such systems have been employed with great success to couple mechanical modes to quantum electron transport. Several transport regimes have been studied, such as single-electron tunneling [33][34][35][36][37][38][39][40][41][42][43][44][45] Kondo [46,47] and the quantum Hall effect [48]. In these systems the electrons can be localized in one (or two) quantum dots and they interact electrostatically with one or several mechanical modes.…”