Counterfactual entanglement distribution without transmitting any particles

Counterfactual quantum-information transfer without transmitting any physical particles

We demonstrate quantum information can be transferred between two distant participants without any physical particles traveling between them. The key procedure of the counterfactual scheme is to entangle two nonlocal qubits with each other without interaction, so the scheme can also be used to generate nonlocal entanglement counterfactually. We here illustrate the scheme by using flying photon ...

Counterfactual quantum erasure: spooky action without entanglement

We combine the eyebrow-raising quantum phenomena of erasure and counterfactuality for the first time, proposing a simple yet unusual quantum eraser: A distant Bob can decide to erase which-path information from Alice's photon, dramatically restoring interference-without previously shared entanglement, and without Alice's photon ever leaving her laboratory.

Quantum multiparty key distribution protocol without use of entanglement

We propose a quantum key distribution (QKD) protocol that enables three parties agree at once on a shared common random bit string in presence of an eavesdropper without use of entanglement. We prove its unconditional security and analyze the key rate.

Entanglement-based quantum key distribution without an entangled-photon source

Quantum key distribution ~QKD! has been studied extensively as a means to realize unconditionally secure communication systems. Two legal parties ~Alice and Bob! create a secret key, security of which against eavesdropping is guaranteed by the law of quantum mechanics, and use it as a one-time pad for encrypting messages. Following the first proposal that used four nonorthogonal states @Benneet...

Entanglement of Identical Particles