title: Loss resilience for two-qubit state transmission using distributed phase sensitive amplification.
abstract: We transmit phase-encoded non-orthogonal quantum states through a 5-km long fibre-based distributed optical phase-sensitive amplifier (OPSA) using telecom-wavelength photonic qubit pairs. The gain is set to equal the transmission loss to probabilistically preserve input states during transmission. While neither state is optimally aligned to the OPSA, each input state is equally amplified with no measurable degradation in state quality. These results promise a new approach to reduce the effects of loss by encoding quantum information in a two-qubit Hilbert space which is designed to benefit from transmission through an OPSA.
authors.affiliation: Applied Communication Sciences, 331 Newman Springs Road, Red Bank, New Jersey 07701, USA.
authors.forename: James M
authors.initials: JM
authors.lastname: Dailey
authors.affiliation: Applied Communication Sciences, 331 Newman Springs Road, Red Bank, New Jersey 07701, USA.
authors.forename: Anjali
authors.initials: A
authors.lastname: Agarwal
authors.affiliation: Applied Communication Sciences, 331 Newman Springs Road, Red Bank, New Jersey 07701, USA.
authors.forename: Paul
authors.initials: P
authors.lastname: Toliver
authors.affiliation: Applied Communication Sciences, 331 Newman Springs Road, Red Bank, New Jersey 07701, USA.
authors.forename: Nicholas A
authors.initials: NA
authors.lastname: Peters