Kolangatt, M and Verma, A and Matta, S and Sengupta, K and Chandrashekar, CM (2024) Four-qubit photonic system for publicly verifiable quantum random numbers and generation of public and private key. In: Physical Review A, 110 (3).
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Abstract
We theoretically propose and experimentally demonstrate the use of a configurable four-qubit photonic system to generate publicly verifiable quantum random numbers, to perform entanglement verification, and to generate a secure public and private key. Quantum circuits, to generate the desired four-qubit states and its experimental realization in the photonic architecture, are carried out using photon pairs entangled in polarization and path degrees of freedom. By performing measurements on the four-qubit system and accessing partial information of the four-qubit state for public verification, we generate publicly verified and purely secured random bits at the rate of 185 kbps from collective data of 370 kbps. When the system is used for generating public and private keys, an equal number of public and private keys are generated simultaneously. We also record about 97.9 of sampled bits from four-qubit states passing entanglement verification and demonstrate the use of public and private key generated for image encryption-decryption. The theoretical model of noise on the four-qubit state and its effect on the generation rate of verified and secured bits are in perfect agreement with the experimental results. This demonstrates the practical use of the small-scale multiqubit photonic system for quantum-safe applications by providing the option for real-time verification of the security feature of the quantum system. © 2024 American Physical Society.
| Item Type: | Journal Article |
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| Publication: | Physical Review A |
| Publisher: | American Physical Society |
| Additional Information: | The copyright for this article belongs to Authors. |
| Keywords: | Fiber optic sensors; Photonic devices; Photons; Quantum cryptography; Quantum electronics; Quantum entanglement; Quantum optics; Qubits; Random number generation, Experimental realizations; Photon pairs; Photonic systems; Private key; Public keys; Publicly verifiable; Quantum circuit; Qubit state; Random generation; Random Numbers |
| Department/Centre: | Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics |
| Date Deposited: | 19 Oct 2024 07:21 |
| Last Modified: | 19 Oct 2024 07:21 |
| URI: | http://eprints.iisc.ac.in/id/eprint/86486 |
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