Nondestructive detection of photonic qubits.

ABSTRACT: One of the biggest challenges in experimental quantum information is to sustain the fragile superposition state of a qubit¹. Long lifetimes can be achieved for material qubit carriers as memories², at least in principle, but not for propagating photons that are rapidly lost by absorption, diffraction or scattering³. The loss problem can be mitigated with a nondestructive photonic qubit detector that heralds the photon without destroying the encoded qubit. Such a detector is envisioned to facilitate protocols in which distributed tasks depend on the successful dissemination of photonic qubits^4,5, improve loss-sensitive qubit measurements^6,7 and enable certain quantum key distribution attacks⁸. Here we demonstrate such a detec

SUBMITTER: Niemietz D 

PROVIDER: S-EPMC7990738 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature