Device-independent quantum secure direct communication under non-Markovian quantum channels

Roy, Pritam; Bera, Subhankar; Gupta, Shashank; Majumdar, A. S.

doi:10.1007/s11128-024-04397-8

Quantum Inf Process

2024

DOI: 10.1007/s11128-024-04397-8

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Device-independent quantum secure direct communication under non-Markovian quantum channels

Pritam Roy,

Subhankar Bera,

Shashank Gupta

et al.

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2024

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Cited by 3 publications

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Effect of noisy environment on secure quantum teleportation of unimodal Gaussian states

Mehrabankar,

Mahmoudi,

Abbasnezhad

et al. 2024

Quantum Inf Process

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Quantum networks rely on quantum teleportation, a process where an unknown quantum state is transmitted between sender and receiver via entangled states and classical communication. In our study, we utilize a continuous variable two-mode squeezed vacuum state as the primary resource for quantum teleportation, shared by Alice and Bob, while exposed to a squeezed thermal environment. Secure quantum teleportation necessitates a teleportation fidelity exceeding 2/3 and the establishment of two-way steering of the resource state. We investigate the temporal evolution of steering and teleportation fidelity to determine critical parameter values for secure quantum teleportation of a coherent Gaussian state. Our findings reveal constraints imposed by temperature, dissipation rate, and squeezing parameters of the squeezed thermal reservoir on the duration of secure quantum teleportation. Intriguingly, we demonstrate that increasing the squeezing parameter of the initial state effectively extends the temporal window for a successful secure quantum teleportation.

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Effect of noisy environment on secure quantum teleportation of unimodal Gaussian states

Mehrabankar,

Mahmoudi,

Abbasnezhad

et al. 2024

Quantum Inf Process

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ChaQra: a cellular unit of the Indian quantum network

Gupta,

Agarwal,

Mogiligidda

et al. 2024

Sci Rep

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Major research interests on quantum key distribution (QKD) are primarily focused on increasing 1. Point-to-point transmission distance (1000 km). 2. Secure key rate (Mbps). 3. Security of quantum layer (device-independence). It is great to push the boundaries in these fronts but these isolated approaches are neither scalable nor cost-effective due to requirements of specialised hardware and different infrastructure. Current and future QKD network requires addressing different set of challenges apart from distance, key rate and quantum security. In this regard, we present ChaQra—a sub quantum network with core features as 1. Crypto agility (integration in the already deployed telecommunication fibres). 2. Software defined networking (SDN paradigm for routing different nodes). 3. reliability (addressing denial-of-service with hybrid quantum safe cryptography). 4. upgradability (modules upgradation based on scientific and technological advancements). 5. Beyond QKD (using QKD network for distributed computing, multi-party computation etc). Our results demonstrate a clear path to create and accelerate quantum secure Indian subcontinent under national quantum mission.

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Two-step quantum dialogue protocols against collective noises

Lin,

Chang,

Tsai

et al. 2024

EPJ Quantum Technol.

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Device-independent quantum secure direct communication under non-Markovian quantum channels

Cited by 3 publications

References 108 publications

Effect of noisy environment on secure quantum teleportation of unimodal Gaussian states

Effect of noisy environment on secure quantum teleportation of unimodal Gaussian states

ChaQra: a cellular unit of the Indian quantum network

Two-step quantum dialogue protocols against collective noises

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