Research output: Contribution to journal › Article › peer-review

**Photonic Hybrid State Entanglement Swapping using Cat State Superpositions.** / Parker, R. C.; Joo, J.; Spiller, T. P.

Research output: Contribution to journal › Article › peer-review

Parker, RC, Joo, J & Spiller, TP 2020, 'Photonic Hybrid State Entanglement Swapping using Cat State Superpositions', *Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences*. https://doi.org/10.1098/rspa.2020.0237

Parker, R. C., Joo, J., & Spiller, T. P. (2020). Photonic Hybrid State Entanglement Swapping using Cat State Superpositions. *Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences*. https://doi.org/10.1098/rspa.2020.0237

Parker RC, Joo J, Spiller TP. Photonic Hybrid State Entanglement Swapping using Cat State Superpositions. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. 2020 Nov 18. https://doi.org/10.1098/rspa.2020.0237

@article{d857cfd4cd4d425aa644931ec312e63c,

title = "Photonic Hybrid State Entanglement Swapping using Cat State Superpositions",

abstract = " We propose the use of hybrid entanglement in an entanglement swapping protocol, as means of distributing a Bell state with high fidelity to two parties, Alice and Bob. The hybrid entanglement used in this work is described as a discrete variable (Fock state) and a continuous variable (cat state superposition) entangled state. We model equal and unequal levels of photonic loss between the two propagating continuous variable modes, before detecting these states via a projective vacuum-one-photon measurement, and the other mode via balanced homodyne detection. We investigate homodyne measurement imperfections, and the associated success probability of the measurement schemes chosen in this protocol. We show that our entanglement swapping scheme is resilient to low levels of photonic losses, as well as low levels of averaged unequal losses between the two propagating modes, and show an improvement in this loss resilience over other hybrid entanglement schemes using coherent state superpositions as the propagating modes. Finally, we conclude that our protocol is suitable for potential quantum networking applications which require two nodes to share entanglement separated over a distance of 5-10 km when used with a suitable entanglement purification scheme. ",

keywords = "quant-ph",

author = "Parker, {R. C.} and J. Joo and Spiller, {T. P.}",

note = "{\textcopyright} 2021 The Authors",

year = "2020",

month = nov,

day = "18",

doi = "10.1098/rspa.2020.0237",

language = "English",

journal = "Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences",

issn = "1364-5021",

publisher = "Royal Society of London",

}

TY - JOUR

T1 - Photonic Hybrid State Entanglement Swapping using Cat State Superpositions

AU - Parker, R. C.

AU - Joo, J.

AU - Spiller, T. P.

N1 - © 2021 The Authors

PY - 2020/11/18

Y1 - 2020/11/18

N2 - We propose the use of hybrid entanglement in an entanglement swapping protocol, as means of distributing a Bell state with high fidelity to two parties, Alice and Bob. The hybrid entanglement used in this work is described as a discrete variable (Fock state) and a continuous variable (cat state superposition) entangled state. We model equal and unequal levels of photonic loss between the two propagating continuous variable modes, before detecting these states via a projective vacuum-one-photon measurement, and the other mode via balanced homodyne detection. We investigate homodyne measurement imperfections, and the associated success probability of the measurement schemes chosen in this protocol. We show that our entanglement swapping scheme is resilient to low levels of photonic losses, as well as low levels of averaged unequal losses between the two propagating modes, and show an improvement in this loss resilience over other hybrid entanglement schemes using coherent state superpositions as the propagating modes. Finally, we conclude that our protocol is suitable for potential quantum networking applications which require two nodes to share entanglement separated over a distance of 5-10 km when used with a suitable entanglement purification scheme.

AB - We propose the use of hybrid entanglement in an entanglement swapping protocol, as means of distributing a Bell state with high fidelity to two parties, Alice and Bob. The hybrid entanglement used in this work is described as a discrete variable (Fock state) and a continuous variable (cat state superposition) entangled state. We model equal and unequal levels of photonic loss between the two propagating continuous variable modes, before detecting these states via a projective vacuum-one-photon measurement, and the other mode via balanced homodyne detection. We investigate homodyne measurement imperfections, and the associated success probability of the measurement schemes chosen in this protocol. We show that our entanglement swapping scheme is resilient to low levels of photonic losses, as well as low levels of averaged unequal losses between the two propagating modes, and show an improvement in this loss resilience over other hybrid entanglement schemes using coherent state superpositions as the propagating modes. Finally, we conclude that our protocol is suitable for potential quantum networking applications which require two nodes to share entanglement separated over a distance of 5-10 km when used with a suitable entanglement purification scheme.

KW - quant-ph

U2 - 10.1098/rspa.2020.0237

DO - 10.1098/rspa.2020.0237

M3 - Article

JO - Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences

JF - Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences

SN - 1364-5021

ER -