Non-classical state generation in macroscopic systems via hybrid discrete-continuous quantum measurements

Abstract

Non-classical 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 non-demolition quadrature measurements and single quanta addition/subtraction to prepare quantum superposition states in bosonic systems. The performance of each permutation is quantified and compared using several different non-classicality criteria including Wigner negativity, non-classical 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 non-classicality 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.

13 pages, 6 figures, 3 pints, close to published version. Amongst results, proposed single phonon subtraction (or addition) to a mechanical squeezed state for optomechanical quantum state engineering

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Cited by in corpus (17)

• Measurement-induced macroscopic superposition states in cavity optomechanics
• Massive quantum systems as interfaces of quantum mechanics and gravity
• Single-Phonon Addition and Subtraction to a Mechanical Thermal State
• Non-Gaussian mechanical motion via single and multi-phonon subtraction from a thermal state
• Optomechanical generation of a mechanical catlike state by phonon subtraction
• Growing macroscopic superposition states via cavity quantum optomechanics
• Two-mode Schrödinger-cat states with nonlinear optomechanics: generation and verification of non-Gaussian mechanical entanglement
• Macroscopic non-classical state preparation via post-selection
• Preparing macroscopic mechanical quantum superpositions via photon detection
• Combining Floquet and Lyapunov techniques for time-dependent problems in optomechanics and electromechanics
• Mechanical cooling in the bistable regime of a dissipative optomechanical cavity with a Kerr medium
• Second-Order Coherence Across the Brillouin Lasing Threshold
• Nonclassicality and decoherence of photon-added squeezed coherent Schrödinger kitten states in a Kerr medium
• Quantum manipulation of a two-level mechanical system
• Proposal for Observing Nonclassicality in Highly Excited Mechanical Oscillators by Single Photon Detection
• Enhanced Laser Cooling of a Mechanical Resonator via Zero-Photon Detection
• Theoretical framework for enhancing or enabling cooling of a mechanical resonator via the anti-Stokes or Stokes interaction and zero-photon detection