Resource state structure for controlled quantum key distribution
arXiv:1903.10163 · doi:10.1140/epjd/e2020-100488-8
Abstract
Quantum entanglement plays a pivotal role in many communication protocols, like secret sharing and quantum cryptography. We consider a scenario where more than two parties are involved in a protocol and share a multipartite entangled state. In particular, we considered the protocol of Controlled Quantum Key Distribution (CoQKD), introduced in the Ref. Chin. Phys. Lett. 20, 183-185 (2003), where, two parties, Alice and Bob establish a key with the cooperation of other parties. Other parties control/supervise whether Alice and Bob can establish the key, its security and key rate. We discuss the case of three parties in detail and find suitable resource states. We discuss the controlling power of the third party, Charlie. We also examine the usefulness of the new resource states for generating conference key and for cooperative teleportation. We find that recently introduced Bell inequalities can be useful to establish the security of the conference key. We also generalize the scenario to more than three parties.
arXiv comment11 pages, 7 figures. Close to published version
References in corpus (22)
- Quantum Cryptography
- Entanglement of Formation of an Arbitrary State of Two Qubits
- The Security of Practical Quantum Key Distribution
- Bell nonlocality
- Measurement-device-independent quantum key distribution
- Persistent entanglement in arrays of interacting particles
- Device-independent security of quantum cryptography against collective attacks
- Optimal eavesdropping in quantum cryptography with six states
- Side-channel-free quantum key distribution
- Quantum Cryptography Based on Orthogonal States
- Teleportation, Bell's Inequalities and Inseparability
- Deterministic secure direct communication using GHZ states and swapping quantum entanglement
- Multi-partite entanglement speeds up quantum key distribution in networks
- On multi-particle entanglement
- Local unitary equivalence of multipartite pure states
- Optimal Controlled Teleportation
- Local unitary equivalence and entanglement of multipartite pure states
- Control power in perfect controlled teleportation via partially entangled channels
- Quantum Key Distribution between N partners: optimal eavesdropping and Bell's inequalities
- Parametrization and distillability of three-qubit entanglement
- New Bell inequalities for three-qubit pure states
- More Communication with Less Entanglement