Two Methods for Quantum Key Distribution Without Shared Reference Frame Under Unital Noise
By
[Submitted on 22 Jun 2026]
Summary
This paper addresses a practical quantum key distribution (QKD) scenario over an unknown, stationary, unital qubit channel where a global shared reference frame cannot be established due to practical limitations like relative movement and rotation of communicating parties (common in satellite QKD). The authors propose two methods to overcome both physical qubit noise and the lack of shared reference frame: (1) constructing the Pauli transfer matrix (PTM) description of the channel without requiring a shared reference frame, and (2) a sequential basis matching (SBM) approach that sequentially identifies channel-optimized local bases. Both methods result in the same effective key exchange rate for QKD, and the optimized approach shows the optimality of BB84 and six-state QKD protocols under these conditions.
Source
bskyTwo Methods for Quantum Key Distribution Without Shared Reference Frame Under Unital Noisearxiv.orgKey quotes
Ā· 5 pulledWe consider a general and practical scenario of quantum key distribution (QKD) over an unknown, stationary, unital qubit channel.
This scenario can routinely appear in satellite QKD.
We propose two methods to overcome the physical qubit noise and the lack of shared reference frame.
In the optimized local bases, the resulting correlations are equivalent, up to outcome relabeling, to those of a Pauli channel, allowing us to show the optimality of the BB84 and six-state QKD protocols under these conditions.
We show that both of these approaches result in the same effective key exchange rate for QKD.
You might also wanna read
Researchers Achieve Quantum Teleportation Using Standard Internet Infrastructure
German researchers have successfully demonstrated quantum teleportation using existing internet infrastructure, teleporting information betw
cordis.europa.euĀ·6mo ago
Generating GottesmanāKitaevāPreskill Qubit States Using Integrated Photonic Chip
The article discusses the generation of GottesmanāKitaevāPreskill (GKP) qubit states using an ultra-low-loss integrated photonic chip, pavin
nature.comĀ·11mo ago
Quantum Error Correction Progress and Future Outlook for Qubit Quality
The article discusses the rapid advancement of quantum error correction, predicting that maximum achievable qubit quality will drastically i
algassert.comĀ·6mo ago
Replicating Quantum Factorisation Records with Unconventional Tools
The paper discusses replicating quantum factorisation records using unconventional tools like an 8-bit home computer, an abacus, and a dog,
eprint.iacr.orgĀ·11mo agoComments
Sign in to join the conversation.
No comments yet. Be the first.