quantum engineering in frequency once upon a timeqkd 3 key: 1 0 0 key :1 0 0 1 1 0 0 1 transmitted...

Download Quantum Engineering in Frequency Once upon a timeQKD 3 Key: 1 0 0 Key :1 0 0 1 1 0 0 1 Transmitted photons

Post on 14-May-2020

0 views

Category:

Documents

0 download

Embed Size (px)

TRANSCRIPT

  • Quantum Engineering in Frequency Domain: high dimensional entanglement manipulation in frequency domain based on integrated modulation technologies.

    B. Galmes*, L. Furfaro*, S. Massar**, K. Phan Huy*, L. Larger*, J. Dudley*, J.M. Merolla* * Département d'Optique, Institut FEMTO-ST, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 6174, Université de Franche-Comté,16 Route de Gray, F-25030 Besançon, France.

    ** Université Libre de Bruxelles, Laboratoire d’information quantique, Brussels, Belgium

    1

  • Introduction

    2

    Quantum information processing have seen significant development both experimental and theoretical advances on generation manipulation and

    detection of quantum states.

    Motivations

    ► Qudit manipulation in Frequency Domain using integrated modulation techniques. ► Standard RF and integrated optical components.

    ► Stable, reliable, versatile architecture.

  • Once upon a time…QKD

    3

    Key :1 0 0Key: 1 0 0

    1 1 0 0 1 Transmitted photons Detected photons

    1 0 0 Extracted Bits

    Eve

    Encrypted data

    Valerio Scarani et al, REVIEWS OF MODERN PHYSICS, VOLUME 81, JULY–SEPTEMBER 2009

  • Once upon a time…QKD in FD

    4

    ω0 + Ω

    ΔФ = π ΔФ = |Ф2 – Ф1|

    ΔФ = 0 ΔФ = ± π/2

    ω0 - Ω ω0 + Ω ω0 - Ω

    ω0 ω0 ω0

  • QKD in FD

    5

    ► RF and Telecom components ► Active Dispersion Management ► Frequency up-conversion 2.5 to 12.5 GHz ► Polarization insensitive receiver

  • QKD in FD emitter

    6

    Laser diode

    RF Circuit

    QPSK

    Modulator

    VCO

    Power supply

  • QKD in FD receiver

    7

    RF Circuit

    Phase Modulators

    Digital interface

  • Industrial Encryption System

    8

    Réseau Lumière

    QKD Module

    2009

  • Industrial Encryption System

    9

    Réseau Lumière

  • From QKD to Qudit manipulation

    10

    Free Optical Field Hamiltonian

    Free RF field Hamiltonian

    Interaction Hamiltonian

    Input state output state (a,φ)

    RF

    José Capmany et al, J. Opt. Soc. Am. B, vol 27, No6, June 2010 P. Kumar et al, IEEE J. Quantum Electron., 45, 2009.

    M. Bloch et al, Opt. Lett. 32, 2007

    Quantum nonlinear interaction between the light and microwave fields in an electro-optic phase

    Modulator

  • Time-frequency entanglement

    11

    Polarization entanglement

    [1] A. Aspect, P. Grangier, and G. Roger, Phys. Rev. Lett. 47, 460 (1981); 49, 91 (1982). [2] J.D. Franson, Phys. Rev. Lett. 62, 2205 (1989). [3] J.G. Rarity and P.R. Tapster, Phys. Rev. Lett. 64, 2495 (1990). [4] A. Mair, A. Vaziri, G. Weihs, and A. Zeilinger, Nature 412, 313 (2001). [5] S. E. Harris, Phys. Rev. A, vol. 78, p. 021807, Aug 2008.

  • 12

    The source – PPLN WG

    The source emits energy-entangled photon pairs :

    Spectrum

    ω0 ω

    using

    and

    =

  • Quantum state manipulation

    13

    EOPM IN OUT

  • Global system

    14

    L. Olislager, S. Massar, J.-M. Merolla, K. Phan Huy et al., Phy. Rev. A, 82, 013804 ( 2010).

    Normalized coincidence count

  • Spectral brightness@5 mW 105 p/s/nm Bandwidth 7 THz

    The Quantum Box

    source

    1m 3

    15

    Laser diode Pump wavelength 775 nm linewidth 1MHz Maximum output power 5 mW Wavelength drift < 50 MHz

    PPLN output

    Periodically Poled Lithium Niobate crystal

  • The Quantum Box

    The quantum states manipulation device

    1m 3

    16

    RF architecture Modulation frequency 12.5 GHz I&Q modulator BW 250 MHz I&Q modulator Phase accuracy > 0.001 rad

    Modulators Half-wave voltage 2.8 V Electro-optic BW 25 GHz Loss 1.2 dB

  • The Quantum Box

    Bragg Filters

    1m 3

    17

    Width @3dB = 3 GHz @30dB = 6.25 GHz Central wavelength 1550nm Frequency shift less than 1pm/K (for external temperature variations)

  • The Quantum Box

    1m 3

    All-in-one dual-channel near infrared Time-Correlated

    Single Photon Counting module

    18

    Quantum Efficiency 20% Detection rate 20 MHz Dead time 10 μs Gate duration 99 ns Dark counts per ns 8.10-7 Time jitter 180 ps

    Specifications

  • N or

    m al

    iz ed

    c oi

    nc id

    en ce

    ra te

    19

    Experimental results

    Experimental

    Theoretical

    o + o +

    o

    Visibility > 99%

  • Conclusion and perspectives

    20

    Conclusion

    ► Demonstration of basic control of qudit in frequency domain

    ► Non locality preliminary results

    ► Standard RF and integrated optical components.

    Prospects ► Non local dispersion management.

    ► Second generation QKD system.

    ► Quantum gate implementation.

    ► Quantum teleportation

    Diapo 1 Diapo 2 Diapo 3 Diapo 4 Diapo 5 Diapo 6 Diapo 7 Diapo 8 Diapo 9 Diapo 10 Diapo 11 Diapo 12 Diapo 13 Diapo 14 The Quantum Box The Quantum Box The Quantum Box The Quantum Box Diapo 19 Diapo 20

Recommended

View more >