Speaker
Description
Synopsis We utilize TIPTOE to directly sample the field of femtosecond bright squeezed vacuum. By resolving the bi-phase nature of the carrier wave, we generate random bit sequences. We perform a full temporal-modal analysis which will allow for random bit generation at PHz rates.
In the last decade, all-optical techniques have been introduced as prospects for quantum random number generators (QRNGs) [1,2]. Such techniques rely on the bi-phase output of a degenerate optical parametric oscillator. Unfortunately, the generation rate of such schemes is limited by the cavity decay time [1]. Here, we use a double-pass parametric down-conversion (PDC) scheme and field sampling of bright squeezed vacuum (BSV) to bypass the need of a cavity.
We utilize tunneling ionization with a perturbation for the time-domain observation of an electric field (TIPTOE) [3] to resolve the field of a femtosecond squeezed vacuum beam. We measure changes in two-photon excitation rate in a Si-based CMOS camera induced by the coherent combination of a pump and a BSV field. We perform a full temporal-modal analysis using spectral embedding and find both one-mode and two-mode emission. We extract the carrier-envelope phase (CEP) of BSV shots with a single temporal mode, and find that it exhibits the expected bimodal phase distribution, whereby the phase is locked to that of the pump, apart from a sign. We binarize this phase distribution, assigning bit values 0 or 1 (see Fig. 1b).
Finally, we run a variety of NIST-compliant tests to certify our generated bit sequences. By assigning one bit per temporal mode, this scheme will allow for PHz-rate QRNG.
References
[1] Opt. Express 20, 19322-19330 (2012)
[2] Science 381, 205-209 (2023)
[3] Optica 5, 402-408 (2018)
| Keyword-1 | Ultrafast optics |
|---|---|
| Keyword-2 | Quantum optics |