News Update

Direct tax mop-up leapfrogs by 20% till July 11Govt may simply transfer management of MTNL to BSNL under contractIMF agrees to USD 7 bn loan: Pak PMManufacturing sector logs 5.9% growth in MayI-T- Section 55(2)(b) of the Act talks of other capital asset, which segregates from sub-clause (iiia) to section 55(2)(aa)B of the Act, that talks about Bonus shares specifically: ITATMandaviya chairs Meeting to review India's preparation for Paris Olympics 2024I-T- As assessee's 2nd return is valid return available at time of processing u/s 143(1), CPC ought to have taken into consideration 2nd return and subject it to processing : ITATIndian delegation visits Doha for India-Qatar Joint Working Group MeetingST - Appellant has not been given any consideration for sale of fleet cards, the actual amount received from M/s. BPCL for sale of fleet cards cannot be subject to levy of service tax: CESTATDoT concludes networking events under Sangam-Digital Twin InitiativeCus - When SCN is not fulfilling the ingredients provided under Section 11A(1) of Central Excise Act, 1944 (pari materia with sub-section (4) of Section 28 of Customs Act, 1962), then demand cannot be sustained on the ground of limitation: CESTATNadda reviews Ayushman Bharat PMJAY and Ayushman Bharat Digital MissionGST - CBIC exempts many services of RailwaysEU leaders defend Biden’s NATO Summit gaffesTurkey tables bill in Parliament to round up millions of stray dogs on streets - Animal lovers protestBiden insists to stay in race but Democrat’s Donors freeze USD 90 millionFormer heads of states urge G20 leaders to vote for billionaire tax proposal mooted by BrazilPlans afoot to boost Lighthouse Tourism in India: SonowalBangladeshi delegation visits India to Explore Transhipment Potential at East Coast PortsSC refers Kejriwal arrest issue to larger Bench against question of Right to Life
 
Researchers devise a low-cost method to secure long-distance communication

By TIOL News Service

NEW DELHI, JUNE 02, 2023: SCIENTISTS have devised a method to overcome distortion due to photon-polarization posed by the constant movement of satellites as well as scrambling of polarization in optical fibres and achieve secure long-distance communication without use of conventional active-polarization tracking devices which are costly.

In this digital age, keeping one's data secure is both a challenge and constant worry. With an increased usage of online services and payment gateways, personal data like Aadhar, PAN, phone numbers, photos, and all classified information remain highly vulnerable.

In order to counter possible data breaches by miscreants and secure communication for both personal and strategic purposes like defence and national security, scientists at the Quantum Information and Computing (QuIC) lab at the Raman Research Institute (RRI) have come up with a solution. They have tried to solve the problem arising due to distortion of photon-polarization posed by the constant movement of satellites as well as scrambling of polarization in optical fibres, over large distances.

QuIC lab has been long involved in developing the most secure, long-distance Quantum Key Distribution (QKD) protocol aimed at creating a globally secure quantum network imminent in our near future. This work is a continuation to the ongoing Quantum experiments using satellite technology, being done in collaboration with the Indian Space Research Organisation(ISRO) through the QuEST research grant.

Towards developing secure communication using Quantum Key Distribution (QKD), researchers at RRI, an autonomous institute funded by the Department of Science and Technology (DST), have proposed an approach using a method to perform entanglement-based QKD called BBM92 QKD protocol. Using this approach, the need for having resource-intensive and complex conventional active-polarization tracking is negated, wherein all real-time polarization tracking is done by placing feedback-based mechanisms at regular intervals.

"Our approach uses novel optimization methods to achieve the best trade-off between the key rate, the quantum-bit-error-rate (QBER-- indicative of the errors in the protocol), and a balanced key symmetry which is needed to ensure minimum probability of eavesdropping. We offer a solution that is cost-effective and uses no extra resources, which removes the necessity of employing active polarization tracking devices," said Professor Urbasi Sinha, head, QuIC lab, and corresponding author of the paper published in the journal Communications Physics (Nature).

In this method to perform entanglement-based QKD, the entangled state had a very high fidelity of 94 percent, established through Quantum State Tomography, a standard technique for estimating the quantum state. Through systematically lowering the fidelity down to a very low 10 percent, the high performance of the protocol remained unchanged.

"The performance of our implementation is independent of any local polarization rotation. Finally, in the classical post-processing step, using our optimization methods, we maximize the key rate, while restricting the QBER below the information-theoretically secure threshold of 11% and ensuring a balanced key symmetry," said Sourav Chatterjee, former project scientist under the QuEST research grant.


POST YOUR COMMENTS
   

TIOL Tube Latest

India's Path to Becoming a Superpower: An Interview with Pratap Singh



Shri Ram Nath Kovind, Hon'ble 14th President of India, addressing the gathering at TIOL Special Awards event.