Proposal for Implementing Device-Independent Quantum Key Distribution Based on a Heralded Qubit Amplifier

We demonstrate the phenomenon of more non- locality with less entanglement; specifically, using weakly entangled states, we observe (i) nonlocal correlations that could provably

Therefore, the purification provides a method to analyze the security of our scheme in an entanglement-based picture, where Alice makes random BB84 measurements on one half of

The created photons have wavelengths of 1310 and 1555 nm and are easily separated using a wavelength division multiplexer (WDM). The 1550 nm photon leaves the laboratory. The

A mixed state, which is clearly nonlocal but does not violate any standard Bell inequality, can be preprocessed by a positive operator-valued measurement (POVM) giving access to

Moreover, using four-dimensional energy-time states, no fast random change of bases is required in our setup: Nature itself decides whether to measure in the energy or in the time

with two independent sources as in entanglement swapping, we analyzed the standard bilo- cality inequality and proved that all pairs of entangled pure states can violate it, in

We show that these correlation data must violate some Bell inequality in order to contain distillable secrecy, if not they could be produced by quantum measurements performed on

Here, we first present briefly the security analysis of our QKD protocol against a large class of attacks under the assumption that the adversary, Eve, can only forward a qubit or