Advanced Photonics, Volume. 6, Issue 3, 036003(2024)
Parallelization of frequency domain quantum gates: manipulation and distribution of frequency-entangled photon pairs generated by a 21 GHz silicon microresonator
Fig. 1. (a) Waveguide dispersion as a function of the wavelength, calculated for a waveguide height of 300 nm and different waveguide widths. (b) SEM image of the resonator. (c) Normalized transmission spectrum of the resonator. (d) Measured quality factor as a function of the wavelength.
Fig. 2. Measured FSR as a function of wavelength and optical frequency around 1540 nm.
Fig. 3. (a) Setup for measurement of the joint spectral intensity. BP, bandpass filter; NF, notch filter; PF, programmable filter; PC, polarization controller; and SNSPDs, superconducting single-photon detectors. (b) Anti-diagonal elements of the JSI measurement for every accessible signal-idler pair from
Fig. 4. Photon pair generation and heralded single-photon characterization of the SOI MR. (a) Setup for measuring single counts, two-photon coincidences, and three-photon coincidences. NF, notch filter; PF, programmable filter; and TT, time tagger. (b) Single counts, (c) coincidences, (d) generated number of pairs, (e) heralded
Fig. 5. Setup for the quantum state tomography. PF, programmable filter; EOM, electro-optic phase modulator. Insets are the action of the PFs on the frequency modes. PF1 is used both as an amplitude filter to select the four modes of the two qubits, and as a phase gate implementing a phase
Fig. 6. Numerical reconstruction of the experimental density matrix of a two-qubit frequency-bin entangled state generated by the SOI resonator + PF1. (a) Real part and (b) imaginary part.
Fig. 7. Fidelity to a maximally entangled state for several frequency-bin entangled photon pairs. The
Fig. 8. (a) Raw coincidences (bars) and QBER (dots) between two users and (b) sifted key rate, calculated using the method in Ref. 34 as a function of
Fig. 9. Classical characterization of the quantum gate. (a) Principle of a frequency-domain operation. (b) Principle of a frequency-domain quantum gate. (c) Phase pattern applied by the PF. (d) Measured tunability of the quantum gate operation.
Fig. 10. (a) Light coupling from mode
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Antoine Henry, Dario A. Fioretto, Lorenzo M. Procopio, Stéphane Monfray, Frédéric Boeuf, Laurent Vivien, Eric Cassan, Carlos Alonzo-Ramos, Kamel Bencheikh, Isabelle Zaquine, Nadia Belabas, "Parallelization of frequency domain quantum gates: manipulation and distribution of frequency-entangled photon pairs generated by a 21 GHz silicon microresonator," Adv. Photon. 6, 036003 (2024)
Category: Research Articles
Received: Sep. 30, 2023
Accepted: May. 22, 2024
Published Online: Jul. 1, 2024
The Author Email: Antoine Henry (antoine.henry@telecom-paris.fr), Nadia Belabas (nadia.belabas@c2n.upsaclay.fr)