Transferring the quantum state of electrons across a Fermi sea with Coulomb interaction
arXiv:1902.07569 · doi:10.1126/science.aaw7856
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 teleportation, across a metallic island within which the electrons are trapped much longer than their quantum lifetime. This effect originates from the low temperature freezing of the island's charge which, in the presence of a single connected electronic channel, enforces a one-to-one correspondence between incoming and outgoing electrons. Such high-fidelity quantum state imprinting is established between well-separated injection and emission locations, through two-path interferences in the integer quantum Hall regime. The added electron quantum phase of can allow for strong and decoherence-free entanglement of propagating electrons, and notably of flying qubits.
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