Efficient use of quantum resources for the transmission of a reference frame

Abstract

We propose a covariant protocol for transmitting reference frames encoded on $N$ spins, achieving sensitivity $N^{-2}$ without the need of a pre-established reference frame and without using entanglement between sender and receiver. The protocol exploits the use of equivalent representations, which were overlooked in the previous literature.

4 pages, no figures; added new references and improved introduction. Accepted for publication on PRL

References in corpus (8)

• Tomography of Quantum Operations
• Using entanglement improves precision of quantum measurements
• Optimal purification of single qubits
• Optimal estimation of quantum dynamics
• On the general problem of quantum phase estimation
• Transmission of a Cartesian Frame by a Quantum System
• Aligning Reference Frames Using Quantum States
• Covariant quantum measurements may not be optimal

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