Quantum Secret Sharing Achieves Device-Independence with Seven-Qubit GHZ State and Simultaneous Key Generation

Quantum cryptography promises secure communication, but relies on trusting the devices used to generate and distribute encryption keys. Santanu Majhi and Goutam Paul, both from the Indian Statistical Institute, Kolkata, address this vulnerability with a new approach to device-independent quantum secret sharing. Their work introduces a cryptographic protocol that overcomes limitations posed by untrusted devices, achieving secure key generation without the need for dedicated testing phases, a significant improvement over existing methods. The researchers demonstrate that their protocol, based on a multipartite pseudo-telepathy game, performs optimally with a seven-qubit system and maintains robustness even with noisy signals, representing a substantial advance in practical quantum cryptography and reducing the resources needed for secure communication.

Device Independent Quantum Secret Sharing Using Multiparty Pseudo-telepathy Game Device-independent quantum secret sharing (DI-QSS) addresses security vulnerabilities in systems reliant on trusted quantum devices.

This research introduces a DI-QSS protocol grounded in the multiparty pseudo-telepathy parity game, achieving device-independence and simultaneous key generation without dedicated hardware verification. This innovative approach allows multiple parties to securely share a secret, even with compromised or untrusted devices. The protocol harnesses pseudo-telepathy, a concept where parties exhibit correlations resembling “mind reading” without direct communication, to establish a shared secret key. The protocol’s design offers enhanced functionality compared to schemes based on CHSH inequalities. It integrates device-independence verification and key-generation into a single phase, achieving optimal performance with a seven-qubit GHZ state configuration. Detailed analysis confirms security against collective attacks, establishing reduced resource requirements for generating a key of a given length compared to existing protocols. Importantly, results demonstrate resilience even in noisy environments. Quantum secret sharing enables a dealer to distribute a secret message among multiple participants, ensuring security unless a sufficient number collude. Device-Independent Quantum Secret Sharing Demonstrated This research presents a novel scheme for device-independent quantum secret sharing (DIQSS). Device-independence is crucial because it ensures security even if the devices used by the parties are untrusted, relying instead on the fundamental laws of quantum mechanics. This is achieved by verifying the violation of Bell inequalities. The protocol utilizes pseudo-telepathy, a specific type of quantum correlation that allows parties to exhibit correlations resembling “mind reading” without direct communication, as the basis for secret sharing. The key achievement of this work is a DIQSS protocol employing a seven-qubit GHZ state, requiring fewer qubits compared to some previous schemes. The same test verifies both device independence and successful key regeneration, simplifying implementation and analysis. The scheme is secure against collective attacks, meaning an adversary cannot collude across multiple rounds to gain information. The paper also analyses performance in a realistic scenario with noise, demonstrating a positive key rate under certain conditions. Seven-Qubit DI-QSS Protocol Achieves Efficiency This research introduces a new device-independent quantum secret sharing (DI-QSS) protocol that overcomes limitations found in existing methods.

The team developed a protocol based on the multiparty pseudo-telepathy parity game, achieving device-independence and simultaneous key generation without requiring separate testing rounds. This innovative approach streamlines the process and improves efficiency, particularly when utilising a seven- qubit GHZ state configuration. The protocol’s performance was analysed against collective attacks, demonstrating a reduction in resource requirements for generating keys of a given length compared to previous schemes. Furthermore, the researchers established the protocol’s robustness even in the presence of noise, a crucial factor for practical implementation.

The team successfully demonstrated a functional DI-QSS protocol where one party acts as the dealer and distributes shares to the others. Like all quantum communication systems, the protocol’s performance is subject to limitations imposed by real-world noise and imperfections in quantum devices. Future work could focus on optimising the protocol for specific hardware platforms and exploring its scalability to larger numbers of participants. Further investigation into error correction techniques could also enhance the protocol’s resilience and practical viability. 👉 More information 🗞 Device Independent Quantum Secret Sharing Using Multiparty Pseudo-telepathy Game 🧠 ArXiv: https://arxiv.org/abs/2512.09699 Tags: Rohail T. As a quantum scientist exploring the frontiers of physics and technology. My work focuses on uncovering how quantum mechanics, computing, and emerging technologies are transforming our understanding of reality. I share research-driven insights that make complex ideas in quantum science clear, engaging, and relevant to the modern world. Latest Posts by Rohail T.: Dressed-state Hamiltonian Engineering Enhances Spin Ensemble Coherence and Delivers 3 dB Sensitivity Gain in AC Magnetometry December 12, 2025 Lieprune Achieves over Compression of Quantum Neural Networks with Negligible Performance Loss for Machine Learning Tasks December 12, 2025 Machine Learning Optimizes BEGe Detector Event Selection, Achieving Efficiency for 10 keV Radiation Detection December 12, 2025