Large Spin Entangled Current from a Passive Device

Details Large Spin Entangled Current from a Passive Device Large Spin Entangled Current from a Passive Device

2008-01-29

arxiv.org/abs/0801.4411v2

New J. Phys. 11 (2009) 013018.

Physics

Quantum Physics

9 pages, 4 figures; Minor corrections made to text and now submitted to New Journal of Physics

Scientific paper

10.1088/1367-2630/11/1/013018

We show that a large entangled current can be produced from a very simple passive device: a cluster of three resonant quantum dots, tunnel coupled to one input lead and two output leads. The device can function in a `clean' mode, when almost all emitted electrons are paired in Bell states, or a `dirty' mode with a far higher emission rate but a significant portion of non-entangled electrons. Subsequent charge detection can enhance performance by identifying the pairs that are most likely to be entangled. The device is robust to specific choice of system parameters and therefore lends itself to immediate experimental demonstration. Applications include quantum repeaters and unconditionally secure interfaces.

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