Coherent coupling of two quantum dots embedded in an Aharonov-Bohm interferometer.

We define two laterally gated small quantum dots with less than 15 electrons in an Aharonov-Bohm geometry in which the coupling between the two dots can be changed. We measure Aharonov-Bohm oscillations for weakly coupled quantum dots. In an intermediate coupling regime we study molecular states of the double dot and extract the magnetic field dependence of the coherently coupled states.

[1]  S. Tarucha,et al.  Microwave spectroscopy of a quantum-dot molecule , 1998, Nature.

[2]  R. Westervelt,et al.  Evolution of Coulomb blockade spectra in parallel coupled quantum dots , 1999 .

[3]  Lydia L. Sohn,et al.  Introduction to Mesoscopic Electron Transport , 1997 .

[4]  R. Blick,et al.  Formation of a Coherent Mode in a Double Quantum Dot , 1998 .

[5]  Michael Suhrke,et al.  Laterrally coupled few-electron quantum dots , 2000 .

[6]  K. Eberl,et al.  Coherent superposition of photon- and phonon-assisted tunneling in coupled quantum dots , 2001 .

[7]  D. Bohm,et al.  Significance of Electromagnetic Potentials in the Quantum Theory , 1959 .

[8]  Amir Yacoby,et al.  Coherence and Phase Sensitive Measurements in a Quantum Dot. , 1995 .

[9]  J. Weis,et al.  Strongly electrostatically coupled quantum dots with separate leads , 2000 .

[10]  Richard M. Martin,et al.  ELECTRONIC PROPERTIES AND SPIN POLARIZATION IN COUPLED QUANTUM DOTS , 1999 .

[11]  L. Sohn,et al.  Mesoscopic electron transport , 1997 .

[12]  Nazarov,et al.  Virtual electron diffusion during quantum tunneling of the electric charge. , 1990, Physical review letters.

[13]  Friedrich C. Simmel,et al.  Low-energy electron-beam lithography using calixarene , 1999 .

[14]  D. DiVincenzo,et al.  Coupled quantum dots as quantum gates , 1998, cond-mat/9808026.

[15]  Matveev,et al.  Tunneling spectroscopy of quantum charge fluctuations in the Coulomb blockade. , 1995, Physical review. B, Condensed matter.

[16]  Shinji Matsui,et al.  Ultrahigh resolution of calixarene negative resist in electron beam lithography , 1996 .

[17]  Probing entanglement and nonlocality of electrons in a double-dot via transport and noise. , 1999, Physical review letters.

[18]  Xuedong Hu,et al.  Hilbert-space structure of a solid-state quantum computer: Two-electron states of a double-quantum-dot artificial molecule , 2000 .

[19]  V. Umansky,et al.  Dephasing in electron interference by a ‘which-path’ detector , 1998, Nature.

[20]  Michael J. Berry,et al.  Single-electron charging in double and triple quantum dots with tunable coupling. , 1995, Physical review letters.

[21]  D. DiVincenzo,et al.  Quantum computation with quantum dots , 1997, cond-mat/9701055.