Please use this identifier to cite or link to this item:
http://hdl.handle.net/2289/8104Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Chatterjee, Sourav | - |
| dc.contributor.author | Goswami, Kaumudibikash | - |
| dc.contributor.author | Chatterjee, Rishab | - |
| dc.contributor.author | Sinha, Urbasi | - |
| dc.date.accessioned | 2023-06-02T08:17:18Z | - |
| dc.date.available | 2023-06-02T08:17:18Z | - |
| dc.date.issued | 2023-05-24 | - |
| dc.identifier.citation | Communications Physics, 2023, Vol. 6, Article No.166 | en_US |
| dc.identifier.issn | 2399-3650 (Online) | - |
| dc.identifier.uri | http://hdl.handle.net/2289/8104 | - |
| dc.description | Open Access | en_US |
| dc.description.abstract | Long-distance photonic implementations of quantum key distribution protocols have gained increased interest due to the promise of information-theoretic security against unauthorized eavesdropping. However, a significant challenge in this endeavor is photon-polarization getting affected due to the birefringence of fibers in fiber-based implementations, or variation of reference frames due to satellite movement in long-haul demonstrations. Conventionally, active feedback-based mechanisms are employed for real-time polarization tracking. Here, we propose and demonstrate an alternative approach via a proof-of-principle experiment over an in-lab entanglement-based (BBM92) protocol. In this approach, we perform a quantum state tomography to arrive at optimal measurement bases for any one party resulting in maximal (anti-)correlation in measurement outcomes of both parties. Our polarization-entangled bi-photons have 94% fidelity with a singlet state and a Concurrence of 0.92. By considering a representative 1 ns coincidence window span, we achieve a quantum-bit-error-rate (QBER) of ≈5%, and a key rate of ≈35 Kbps. The performance of our implementation is independent of any local polarization rotation. Finally, using optimization methods we achieve the best trade-off between the key rate, QBER, and balanced key symmetry. Our approach obviates the need for active polarization tracking. It is also applicable to such demonstrations with non-maximally entangled states and prepare-and-measure-based protocols with partially polarized single-photon sources. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Nature Publishing Group | en_US |
| dc.relation.uri | https://doi.org/10.1038/s42005-023-01235-8 | en_US |
| dc.rights | 2023 The Author(s) | en_US |
| dc.title | Polarization bases compensation towards advantages in satellite-based QKD without active feedback | en_US |
| dc.type | Article | en_US |
| Appears in Collections: | Research Papers (LAMP) | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2023_Communications Physics_Vol.6_p116.pdf Restricted Access | Open Access | 1.26 MB | Adobe PDF | View/Open Request a copy |
Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.