Events in Physics

Natural Mode Entanglement as a Resource for Quantum Dense Coding

Natural particle-number entanglement resides between spatial modes in coherent ultra-cold atomic gases. However, operations on the modes are restricted by a superselection rule that forbids coherent superpositions of different particle numbers.? This seemingly prevents mode entanglement being used as a resource for quantum communication. In this talk, I will demonstrate that mode entanglement of a single massive particle can be used for dense coding despite the superselection rule. I will show that the full quantum channel capacity is achieved if both parties share a coherent particle reservoir. The talk is based upon results in L. Heaney and V. Vedral, Phys. Rev. Lett. 103, 200502 (2009).