Entangled Non-Local Quantum Interferometry

All-Versus-Nothing Nonlocality Test of Quantum Mechanics by Two-Photon Hyperentanglement

“…Figure 1(c) shows the characteristic quantum resonance effect arising in the BS linear superposition of the two components of any bipartite entangled state [20]. It is expressed here for k entanglement by the coincidence rate Ca 0 1 ; b 0 1 as a function of x.…”

Multiparticle Quantum Superposition and Stimulated Entanglement by Parity Selective Amplification of Entangled States

“…Turn now the attention to the parity-selective interferometer acting on the output beams k j emerging from the OPA amplifier [6]. Note first that NEIF reproduces exactly the Bell-state measurement configuration at the Alice's site of the first quantum state teleportation (QST) experiment [7].…”

“…This phase selectivity property is inverted by adoption of the complementary coincidences ͑D 1h D 2y ͒ ͑D 2h D 1y ͒ as shown by the data given in Fig. 2 as a function of the BS position X: there an input triplet leads to a resonance peak and a singlet to a dip [6]. Consider now the s-v noise which is generated by R amplification of the vacuum state in the absence of the injected photon couples.…”

“…As a relevant step forward in the realization of the quantum injection scheme, the present work reports a novel optical parametric amplifier (OPA) system that transforms any input linear-polarization (π) entangled, 2-photon state (ebit) into a quantum superposition of π-entangled, multi-photon states, indeed an optical "Schroedinger Cat" state (S-Cat) [10]. In order to achieve this result the new system implements an efficient parity-selective device, usually referred to as "nonlocal entangled interferometer" (NEIF) [11]. In the language of electrical engeneering, NEIF conveys on different output channels the squeezed-vacuum "noise" and the "signal", viz.…”

“…This was excited by focusing the UV beam on the right plane surface of the NL crystal by a lens with focal length f p = 1m. Photon couples in π-entangled states at a wl λ = 795nm were then generated with an entanglement phase Φ ′ equal to the intrinsic QIOPA phase Ψ determined by the spatial orientation of the Type II crystal: Φ ′ = Ψ [11,12]. The dynamical role of Ψ will be defined by the theory given below.…”