Journal
PHYSICAL REVIEW A
Volume 93, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.93.053818
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Funding
- Australian Research Council Discovery Project [DP140101638]
- OPSOQI Project of the WWTF [316607]
- CoQuS doctoral programme DK CoQuS [W 1210]
- START Grant [Y 591-N16]
- UK Engineering and Physical Sciences Research Council [EPSRC EP/K034480/1]
- Austrian Science Fund (FWF) [W1210] Funding Source: Austrian Science Fund (FWF)
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Nonclassical-state generation is an important component throughout experimental quantum science for quantum information applications and probing the fundamentals of physics. Here, we investigate permutations of quantum nondemolition quadrature measurements and single quanta addition or subtraction to prepare quantum superposition states in bosonic systems. The performance of each permutation is quantified and compared using several different nonclassicality criteria including Wigner negativity, nonclassical depth, and optimal fidelity with a coherent-state superposition. We also compare the performance of our protocol using squeezing instead of a quadrature measurement and find that the purification provided by the quadrature measurement can significantly increase the nonclassicality generated. Our approach is ideally suited for implementation in light-matter systems such as quantum optomechanics and atomic spin ensembles, and offers considerable robustness to initial thermal occupation.
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