### Abstract

Multiphoton absorption processes have a nonlinear dependence on the amplitude of the incident optical field, i.e., the number of photons. However, multiphoton absorption is generally weak and multiphoton events occur with extremely low probability. Consequently, it is extremely challenging to engineer quantum nonlinear devices that operate at the single photon level and the majority of quantum technologies have to rely on single photon interactions. Here we demonstrate experimentally and theoretically that exploiting coherent absorption of N=2 NOON states makes it possible to enhance the number of two-photon states that are absorbed by at most a factor of 2 with respect to a linear absorption process. An absorbing metasurface placed inside a Sagnac-style interferometer into which we inject an N=2 NOON state, exhibits two-photon absorption with 40.5% efficiency, close to the theoretical maximum. This high probability of simultaneous absorption of two photons holds the promise for applications in fields that require multiphoton upconversion but are hindered by high peak intensities.

Language | English |
---|---|

Article number | 011801 |

Journal | Physical Review A |

Volume | 99 |

Issue number | 1 |

DOIs | |

State | Published - 14 Jan 2019 |

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### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics

### Cite this

*Physical Review A*,

*99*(1), [011801]. DOI: 10.1103/PhysRevA.99.011801

}

*Physical Review A*, vol. 99, no. 1, 011801. DOI: 10.1103/PhysRevA.99.011801

**Coherent metamaterial absorption of two-photon states with 40% efficiency.** / Lyons, Ashley; Oren, Dikla; Roger, Thomas; Savinov, Vassili; Valente, João; Vezzoli, Stefano; Zheludev, Nikolay I.; Segev, Mordechai; Faccio, Daniele.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Coherent metamaterial absorption of two-photon states with 40% efficiency

AU - Lyons,Ashley

AU - Oren,Dikla

AU - Roger,Thomas

AU - Savinov,Vassili

AU - Valente,João

AU - Vezzoli,Stefano

AU - Zheludev,Nikolay I.

AU - Segev,Mordechai

AU - Faccio,Daniele

PY - 2019/1/14

Y1 - 2019/1/14

N2 - Multiphoton absorption processes have a nonlinear dependence on the amplitude of the incident optical field, i.e., the number of photons. However, multiphoton absorption is generally weak and multiphoton events occur with extremely low probability. Consequently, it is extremely challenging to engineer quantum nonlinear devices that operate at the single photon level and the majority of quantum technologies have to rely on single photon interactions. Here we demonstrate experimentally and theoretically that exploiting coherent absorption of N=2 NOON states makes it possible to enhance the number of two-photon states that are absorbed by at most a factor of 2 with respect to a linear absorption process. An absorbing metasurface placed inside a Sagnac-style interferometer into which we inject an N=2 NOON state, exhibits two-photon absorption with 40.5% efficiency, close to the theoretical maximum. This high probability of simultaneous absorption of two photons holds the promise for applications in fields that require multiphoton upconversion but are hindered by high peak intensities.

AB - Multiphoton absorption processes have a nonlinear dependence on the amplitude of the incident optical field, i.e., the number of photons. However, multiphoton absorption is generally weak and multiphoton events occur with extremely low probability. Consequently, it is extremely challenging to engineer quantum nonlinear devices that operate at the single photon level and the majority of quantum technologies have to rely on single photon interactions. Here we demonstrate experimentally and theoretically that exploiting coherent absorption of N=2 NOON states makes it possible to enhance the number of two-photon states that are absorbed by at most a factor of 2 with respect to a linear absorption process. An absorbing metasurface placed inside a Sagnac-style interferometer into which we inject an N=2 NOON state, exhibits two-photon absorption with 40.5% efficiency, close to the theoretical maximum. This high probability of simultaneous absorption of two photons holds the promise for applications in fields that require multiphoton upconversion but are hindered by high peak intensities.

UR - http://www.scopus.com/inward/record.url?scp=85060144568&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.99.011801

DO - 10.1103/PhysRevA.99.011801

M3 - Article

VL - 99

JO - Physical Review A

T2 - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 1

M1 - 011801

ER -