Abstract
A novel method of macroscopically entangled light-pair generation is presented for a quantum laser using randomness-based deterministic phase control of coherent light in a coupled Mach–Zehnder interferometer (MZI). Unlike the particle nature-based quantum correlation in conventional quantum mechanics, the wave nature of photons is applied for collective phase control of coherent fields, resulting in a deterministically controllable nonclassical phenomenon. For the proof of principle, the entanglement between output light fields from a coupled MZI is examined using the Hong-Ou-Mandel-type anticorrelation technique, where the anticorrelation is a direct evidence of the nonclassical features in an interferometric scheme. For the generation of random phase bases between two bipartite input coherent fields, a deterministic control of opposite frequency shifts results in phase sensitive anticorrelation, which is a macroscopic quantum feature.
Highlights
A novel method of macroscopically entangled light-pair generation is presented for a quantum laser using randomness-based deterministic phase control of coherent light in a coupled Mach–Zehnder interferometer (MZI)
Entangled photon sources from spontaneous parametric down conversion (SPDC) p rocesses[17], and independent light sources from such as quantum dots and s unlight[18] have been used for demonstrating nonclassical features via coincidence measurements. All of these studies have focused on the particle nature of photons, even though coherence is the bedrock for entanglement generation
Considering the coherence de Broglie wavelength (CBW)[27], the origin of macroscopically entangled light pairs is the superposition between MZI phase bases[26,27,28,29,30], where randomness is an essential requirement for g(1) coherence[37]
Summary
A novel method of macroscopically entangled light-pair generation is presented for a quantum laser using randomness-based deterministic phase control of coherent light in a coupled Mach–Zehnder interferometer (MZI). For direct evidence of nonclassical features in entangled photon pairs, the Bell inequality violation[2], Franson-type nonlocal correlation[3], and Hong-Ou-Mandel (HOM) anticorrelation[4] have been investigated over the decades in both noninterferometric[5,6,7,8,9] and interferometric schemes[10,11,12,13,14,15,16] In these studies, entangled photon sources from spontaneous parametric down conversion (SPDC) p rocesses[17], and independent light sources from such as quantum dots and s unlight[18] have been used for demonstrating nonclassical features via coincidence measurements. Heisenberg’s uncertainty principle does not limit a quantum mechanically coupled system as it does in E PR1 and Popper’s though experiment[39]
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