Loss-tolerant transmission of multiphoton-qubit information via hybrid entanglement
16 Mar 2020
•
Choi Seongjeon
•
Lee Seok-Hyung
•
Jeong Hyunseok
It was shown that using multiphoton qubits, a nearly deterministic Bell-state
measurement can be performed with linear optics and on-off photodetectors
[Phys. Rev...Lett. 114, 113603 (2015)]. However, multiphoton qubits are
generally more fragile than single-photon qubits under a lossy environment. In
this paper, we propose and analyze a scheme to teleport multiphoton-qubit
information using hybrid entanglement with a loss-tolerant carrier qubit. We
consider three candidates for the carrier qubit: a coherent-state qubit, a
single-photon polarization qubit, and a vacuum-and-single-photon qubit. We find
that teleportation with the vacuum-and-single-photon qubit tolerates about 10
times greater photon losses than with the multiphoton qubit of the photon
number $N \geq 4$ in the high fidelity regime ($F\geq 90\%$). The
coherent-state qubit encoding may be even better than the
vacuum-and-single-photon qubit as the carrier when its amplitude is as small as
$\alpha<0.78$. We further point out that the fidelity of the teleported state
by our scheme is determined by loss in the carrier qubit while the success
probability depends on loss only in the multiphoton qubit to be teleported. Our
study implies that the hybrid architecture may complement the weaknesses of
each qubit encoding.(read more)