Fève G, Mahé A, Berroir J-M, Kontos T, Plaçais B, Glattli D C, Cavanna A, Etienne B, Jin Y
Laboratoire Pierre Aigrain, Département de Physique de l'Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France.
Science. 2007 May 25;316(5828):1169-72. doi: 10.1126/science.1141243.
We report on the electron analog of the single-photon gun. On-demand single-electron injection in a quantum conductor was obtained using a quantum dot connected to the conductor via a tunnel barrier. Electron emission was triggered by the application of a potential step that compensated for the dot-charging energy. Depending on the barrier transparency, the quantum emission time ranged from 0.1 to 10 nanoseconds. The single-electron source should prove useful for the use of quantum bits in ballistic conductors. Additionally, periodic sequences of single-electron emission and absorption generate a quantized alternating current.
我们报道了单光子枪的电子类似物。通过一个经由隧道势垒连接到量子导体的量子点，实现了在量子导体中按需单电子注入。通过施加一个补偿量子点充电能量的电势阶跃来触发电子发射。根据势垒透明度的不同，量子发射时间范围为0.1到10纳秒。这种单电子源对于在弹道导体中使用量子比特应该是有用的。此外，单电子发射和吸收的周期性序列会产生一个量化的交变电流。
