### Abstract

We explore the use of a switchable single-photon detector (SPD) array scheme to reduce the effect of a detector's deadtime for a multi-bit/photon quantum link. The case of data encoding using M possible orbital-angular-momentum (OAM) states is specifically studied in this paper. Our method uses N SPDs with a controllable M×N optical switch and we use a Monte Carlo-based method to simulate the quantum detection process. The simulation results show that with the use of the switchable SPD array, the detection system can allow a higher incident photon rate than what might otherwise be limited by detectors’ deadtime. For the case of M=4, N=20, a 50-ns deadtime for the individual SPDs, an average photon number per pulse of 0.1, and under the limit that at most 10 % of the photon-containing pulses are missed, the switchable SPD array will allow an incident photon rate of 2250 million counts/s (Mcts/s). This is 25 times the 90 Mcts/s incident photon rate that a non-switchable, 4-SPD array will allow. The increase in incident photon rate is more than the 5 times increase, which is the simple increase in the number of SPDs and the number of OAM encoding states (e.g., N∕M=20∕4).

Original language | English (US) |
---|---|

Pages (from-to) | 132-137 |

Number of pages | 6 |

Journal | Optics Communications |

Volume | 441 |

DOIs | |

State | Published - Jun 15 2019 |

Externally published | Yes |

### Fingerprint

### Keywords

- Orbital angular momentum
- Quantum communication
- Single photon detection

### ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering

### Cite this

*Optics Communications*,

*441*, 132-137. https://doi.org/10.1016/j.optcom.2019.01.081

**Switchable detector array scheme to reduce the effect of single-photon detector's deadtime in a multi-bit/photon quantum link.** / Liu, Cong; Ren, Yongxiong; Zhao, Jiapeng; Mirhosseini, Mohammad; Hashemi Rafsanjani, Seyed Mohammad; Xie, Guodong; Pang, Kai; Song, Haoqian; Zhao, Zhe; Wang, Zhe; Li, Long; Bienfang, Joshua C.; Migdall, Alan; Brun, Todd A.; Tur, Moshe; Boyd, Robert W.; Willner, Alan E.

Research output: Contribution to journal › Article

*Optics Communications*, vol. 441, pp. 132-137. https://doi.org/10.1016/j.optcom.2019.01.081

}

TY - JOUR

T1 - Switchable detector array scheme to reduce the effect of single-photon detector's deadtime in a multi-bit/photon quantum link

AU - Liu, Cong

AU - Ren, Yongxiong

AU - Zhao, Jiapeng

AU - Mirhosseini, Mohammad

AU - Hashemi Rafsanjani, Seyed Mohammad

AU - Xie, Guodong

AU - Pang, Kai

AU - Song, Haoqian

AU - Zhao, Zhe

AU - Wang, Zhe

AU - Li, Long

AU - Bienfang, Joshua C.

AU - Migdall, Alan

AU - Brun, Todd A.

AU - Tur, Moshe

AU - Boyd, Robert W.

AU - Willner, Alan E.

PY - 2019/6/15

Y1 - 2019/6/15

N2 - We explore the use of a switchable single-photon detector (SPD) array scheme to reduce the effect of a detector's deadtime for a multi-bit/photon quantum link. The case of data encoding using M possible orbital-angular-momentum (OAM) states is specifically studied in this paper. Our method uses N SPDs with a controllable M×N optical switch and we use a Monte Carlo-based method to simulate the quantum detection process. The simulation results show that with the use of the switchable SPD array, the detection system can allow a higher incident photon rate than what might otherwise be limited by detectors’ deadtime. For the case of M=4, N=20, a 50-ns deadtime for the individual SPDs, an average photon number per pulse of 0.1, and under the limit that at most 10 % of the photon-containing pulses are missed, the switchable SPD array will allow an incident photon rate of 2250 million counts/s (Mcts/s). This is 25 times the 90 Mcts/s incident photon rate that a non-switchable, 4-SPD array will allow. The increase in incident photon rate is more than the 5 times increase, which is the simple increase in the number of SPDs and the number of OAM encoding states (e.g., N∕M=20∕4).

AB - We explore the use of a switchable single-photon detector (SPD) array scheme to reduce the effect of a detector's deadtime for a multi-bit/photon quantum link. The case of data encoding using M possible orbital-angular-momentum (OAM) states is specifically studied in this paper. Our method uses N SPDs with a controllable M×N optical switch and we use a Monte Carlo-based method to simulate the quantum detection process. The simulation results show that with the use of the switchable SPD array, the detection system can allow a higher incident photon rate than what might otherwise be limited by detectors’ deadtime. For the case of M=4, N=20, a 50-ns deadtime for the individual SPDs, an average photon number per pulse of 0.1, and under the limit that at most 10 % of the photon-containing pulses are missed, the switchable SPD array will allow an incident photon rate of 2250 million counts/s (Mcts/s). This is 25 times the 90 Mcts/s incident photon rate that a non-switchable, 4-SPD array will allow. The increase in incident photon rate is more than the 5 times increase, which is the simple increase in the number of SPDs and the number of OAM encoding states (e.g., N∕M=20∕4).

KW - Orbital angular momentum

KW - Quantum communication

KW - Single photon detection

UR - http://www.scopus.com/inward/record.url?scp=85062215080&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85062215080&partnerID=8YFLogxK

U2 - 10.1016/j.optcom.2019.01.081

DO - 10.1016/j.optcom.2019.01.081

M3 - Article

VL - 441

SP - 132

EP - 137

JO - Optics Communications

JF - Optics Communications

SN - 0030-4018

ER -