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Transmitting the quantum state of electrons across a metallic island with Coulomb interaction

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Science  06 Dec 2019:
Vol. 366, Issue 6470, pp. 1243-1247
DOI: 10.1126/science.aaw7856

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Transmitting quantum states

The coherence of electrons in mesoscopic structures is thought to be unlikely to survive in a disordered environment. Duprez et al. show that this is not necessarily the case. They studied a metallic island as an example of a disordered environment. They made an electron interferometer and incorporated the island in one of the two paths through the interferometer. At sufficiently low temperatures and in the quantum Hall regime, they observed a clear interference pattern, indicating successful transmission of the electrons' quantum state across the island.

Science, this issue p. 1243

Abstract

The Coulomb interaction generally limits the quantum propagation of electrons. However, it can also provide a mechanism to transfer their quantum state over larger distances. Here, we demonstrate such a form of electron teleportation across a metallic island. This effect originates from the low-temperature freezing of the island’s charge Q which, in the presence of a single connected electronic channel, enforces a one-to-one correspondence between incoming and outgoing electrons. Such faithful quantum state imprinting is established between well-separated injection and emission locations and evidenced through two-path interferences in the integer quantum Hall regime. The additional quantum phase of 2πQ/e, where e is the electron charge, may allow for decoherence-free entanglement of propagating electrons, and notably of flying qubits.

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