Single-electron transistor backaction on the single-electron box

We report an experimental observation of the backaction of a single-electron transistor sSETd measuring the Coulomb staircase of a single-electron box. As current flows through the SET, the charge state of the SET island fluctuates. These fluctuations capacitively couple to the box and cause changes in the position, width, and asymmetry of the Coulomb staircase. A sequential tunneling model accurately recreates these effects, confirming this mechanism of the backaction of a SET. This is a first step toward understanding the effects of quantum measurement on solid-state qubits.

[1]  D. Schuster,et al.  Measurement of the excited-state lifetime of a microelectronic circuit. , 2003, Physical review letters.

[2]  Michel H. Devoret,et al.  Amplifying quantum signals with the single-electron transistor , 2000, Nature.

[3]  J. Lukens,et al.  Effect of measurement on the periodicity of the Coulomb staircase of a superconducting box. , 2004, Physical review letters.

[4]  R J Schoelkopf,et al.  Radio-frequency single-electron transistor as readout device for qubits: charge sensitivity and backaction. , 2001, Physical review letters.

[5]  M. L. Wolbarsht,et al.  NATO Advanced Study Institute. , 1986, IEEE transactions on medical imaging.

[6]  Miles P. Blencowe,et al.  Sensitivity of a micromechanical displacement detector based on the radio-frequency single-electron transistor , 2000 .

[7]  M. Devoret,et al.  Direct observation of macroscopic charge quantization , 1991 .

[8]  R. Schoelkopf,et al.  The radio-frequency single-electron transistor (RF-SET): A fast and ultrasensitive electrometer , 1998, Science.

[9]  G. J. Milburn,et al.  Single Spin Measurement using Single Electron Transistors to Probe Two Electron Systems , 2000 .

[10]  M. Devoret,et al.  Quantum coherence with a single Cooper pair , 1998 .

[11]  R. Schoelkopf,et al.  Quantum charge fluctuations and the polarizability of the single-electron box. , 2003, Physical review letters.

[12]  J. E. Mooij,et al.  Charge spectrometry with a strongly coupled superconducting single-electron transistor , 2001 .