Abstract
We present a very brief overview of entanglement swapping as it relates to continuous-variable quantum information. The technical background required is discussed and the natural link to quantum teleportation is established before discussing the nature of Gaussian entanglement swapping. The limitations of Gaussian swapping are introduced, along with the general applications of swapping in the context of to quantum communication and entanglement distribution. In light of this, we briefly summarize a collection of entanglement swapping schemes which incorporate a non-Gaussian ingredient and the benefits of such schemes are noted. Finally, we motivate the need to further study and develop such schemes by highlighting requirements of a continuous-variable repeater.
Highlights
Information permeates through most, if not all, aspects of our everyday life
An important primitive in quantum communication is that of quantum teleportation [4,5]; this provides a method of transferring an unknown quantum state from one party, Alice, to another, Bob, given that they already share an entangled state
We have presented a collection, but by no means all, of CV entanglement swapping protocols and briefly discussed their application to quantum key distribution and the notion of distillation and quantum repeaters
Summary
Information permeates through most, if not all, aspects of our everyday life. Sometimes it’s easy to forget the value our culture places on information; for example, a fraction of a second can make the difference between a profit or a loss as it does in high-frequency trading [1]. An important primitive in quantum communication is that of quantum teleportation [4,5]; this provides a method of transferring an unknown quantum state from one party, Alice, to another, Bob, given that they already share an entangled state. Quantum information and how it relates to recent advances in the field. The paper is structured as follows: In Section 2 we review the necessary formalism to discuss entanglement swapping.
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