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More Entanglement Implies Higher Performance in Channel Discrimination Tasks.

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Entangled states offer an advantage in channel discrimination tasks when using an ancilla, with the benefit quantified by the Schmidt number. This entanglement robustness provides a significant multiplicative advantage over non-ancilla assisted methods.

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Area of Science:

  • Quantum Information Science
  • Quantum Communication

Background:

  • Entanglement is a key quantum resource.
  • Channel discrimination is crucial for quantum information processing.

Purpose of the Study:

  • To quantify the advantage of entangled states in ancilla-assisted channel discrimination.
  • To link this advantage to the degree of entanglement (Schmidt number).

Main Methods:

  • Utilizing ancilla-assisted bi- and multichannel discrimination protocols.
  • Quantifying entanglement advantage using the Schmidt number and its robustness.

Main Results:

  • Every entangled state provides a demonstrable advantage in ancilla-assisted discrimination.
  • The Schmidt number precisely quantifies this entanglement-based advantage.
  • Entanglement robustness yields the maximal multiplicative advantage compared to non-ancilla methods.

Conclusions:

  • Entanglement offers a quantifiable advantage in quantum channel discrimination.
  • The Schmidt number serves as a robust measure of this advantage.
  • Ancilla-assisted discrimination highlights the practical utility of entanglement in quantum tasks.