Quantum Communication without Alignment using Multiple-Qubit Single-Photon States

2007/03/06 by Leandro Aolita, L. Aolita, S. P. Walborn · 3 citations
Computer Science · Physics and Astronomy · #Bell state #Computer science #Frame (networking) #Photon #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum channel #Quantum entanglement #Quantum error correction #Quantum information #Quantum information science #Quantum key distribution #Quantum mechanics #Quantum network #Quantum teleportation #Qubit #Reference frame #Superdense coding #Telecommunications #quant-ph

paper · pdf · doi:10.1103/physrevlett.98.100501

published as Phys. Rev. Lett. 98, 100501 (2007)

openalex publication_date 2007/03/06 · arxiv created 2007/03/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We propose a scheme for encoding logical qubits in a subspace protected against collective rotations around the propagation axis using the polarization and transverse spatial degrees of freedom of single photons. This encoding allows for quantum key distribution without the need of a shared reference frame. We present methods to generate entangled states of two logical qubits using present day down-conversion sources and linear optics, and show that the application of these entangled logical states to quantum information schemes allows for alignment-free tests of Bell's inequalities, quantum dense coding, and quantum teleportation.

Citations

• Experimental quantum teleportation
• Teleporting an unknown quantum state via dual classical and Einstein-Podolsky-Rosen channels
• Quantum cryptography based on Bell’s theorem
• Stabilization of Quantum Computations by Symmetrization
• Nonlocality for two particles without inequalities for almost all entangled states
• Efficient Use of Quantum Resources for the Transmission of a Reference Frame
• Classical and Quantum Communication without a Shared Reference Frame
• Quantum computers and dissipation

Cited by

• Quantum steering with vector vortex photon states with the detection loophole closed
• Distribution of high-dimensional entanglement via an intra-city free-space link
• Classical analog of quantum contextuality in spin-orbit laser modes