Analysis of continuous-variable quantum teleportation enhanced by measurement-based noiseless quantum amplification.

Area of Science:

• Quantum Information Science
• Quantum Optics
• Quantum Communication

Background:

• Continuous-variable quantum teleportation (CVQT) allows deterministic transfer of quantum states.
• CVQT performance is limited by the entanglement squeezing and inherent noise.
• Existing protocols struggle to achieve high fidelity and low added noise.

Purpose of the Study:

• To provide a detailed theoretical analysis of measurement-based noiseless quantum amplification for CVQT.
• To investigate the effects and limitations of this amplification technique.
• To explore the potential for improved fidelity and reduced noise in state teleportation.

Main Methods:

• Theoretical analysis of a CVQT protocol incorporating measurement-based noiseless amplification.
• Application of an inverse Gaussian filter to continuous-variable Bell measurement outcomes.
• Focus on teleportation of Gaussian states with variable displacement and fixed covariance.

Main Results:

• The protocol conditionally improves the precision of estimating the teleported state's coherent displacement.
• Increased fidelity of state teleportation is achieved.
• Unity-gain teleportation becomes feasible with lower added thermal noise compared to deterministic methods.

Conclusions:

• Measurement-based noiseless amplification offers a powerful method to enhance CVQT performance.
• This technique overcomes limitations of traditional CVQT by improving state estimation precision.
• The findings pave the way for more robust and efficient quantum state transfer.