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Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
R. Hanson, L. H. Willems van Beveren, I. T. Vink +5
We present a method for reading out the spin state of electrons in a quantum dot that is robust against charge noise and can be used even when the electron temperature exceeds the…
Electronic excitation spectrum of metallic carbon nanotubes
S. Sapmaz, P. Jarillo-Herrero, J. Kong +3
We have studied the discrete electronic spectrum of closed metallic nanotube quantum dots. At low temperatures, the stability diagrams show a very regular four-fold pattern that al…
Planar nanocontacts with atomically controlled separation
Y. V. Kervennic, D. Vanmaekelbergh, L. P Kouwenhoven +1
We have developed a technology to reproducibly make gaps with distance control on the single atom scale. The gold contacts are flat on the nanometre scale and are fabricated on an…
Single-shot read-out of an individual electron spin in a quantum dot
J. M. Elzerman, R. Hanson, L. H. Willems van Beveren +3
Spin is a fundamental property of all elementary particles. Classically it can be viewed as a tiny magnetic moment, but a measurement of an electron spin along the direction of an…
Nanometer-spaced platinum electrodes with calibrated separation
Y. -V. Kervennic, H. S. J. Van der Zant, A. F. Morpurgo +2
We have fabricated pairs of platinum electrodes with separation between 20 and 3.5 nm. Our technique combines electron beam lithography and chemical electrodeposition. We show that…
Electronic Transport Spectroscopy of Carbon Nanotubes in a Magnetic Field
P. Jarillo-Herrero, J. Kong, H. S. J. van der Zant +3
We report magnetic field spectroscopy measurements in carbon nanotube quantum dots exhibiting four-fold shell structure in the energy level spectrum. The magnetic field induces a l…
Electron-hole symmetry in a semiconducting carbon nanotube quantum dot
Pablo Jarillo-Herrero, Sami Sapmaz, Cees Dekker +2
Optical and electronic phenomena in solids arise from the behaviour of electrons and holes (unoccupied states in a filled electron sea). Electron-hole symmetry can often be invoked…
Controlling Spin Qubits in Quantum Dots
Hans-Andreas Engel, L. P. Kouwenhoven, Daniel Loss +1
We review progress on the spintronics proposal for quantum computing where the quantum bits (qubits) are implemented with electron spins. We calculate the exchange interaction of c…
Determination of the tunnel rates through a few-electron quantum dot
R. Hanson, I. T. Vink, D. P. DiVincenzo +4
We demonstrate how rate equations can be employed to find analytical expressions for the sequential tunneling current through a quantum dot as a function of the tunnel rates, for a…
Real-time detection of single electron tunneling using a quantum point contact
L. M. K. Vandersypen, J. M. Elzerman, R. N. Schouten +3
We observe individual tunnel events of a single electron between a quantum dot and a reservoir, using a nearby quantum point contact (QPC) as a charge meter. The QPC is capacitivel…
Detection of quantum noise from mesoscopic devices with an SIS detector
R. Deblock, E. Onac, L. Gurevich +1
Quantum mechanics can strongly influence the noise properties of mesoscopic devices. To probe this effect we have measured the current fluctuations at high-frequency (5-90G Hz) usi…