Effect of noise and enhancement of nonlocality in on/off photodetection
arXiv:quant-ph/0507057 · doi:10.1103/PhysRevA.72.042105
Abstract
Nonlocality of two-mode states of light is addressed by means of CHSH inequality based on displaced on/off photodetection. Effects due to non-unit quantum efficiency and nonzero dark counts are taken into account. Nonlocality of both balanced and unbalanced superpositions of few photon-number states, as well as that of multiphoton twin beams, is investigated. We find that unbalanced superpositions show larger nonlocality than balanced one when noise affects the photodetection process. De-Gaussification by means of (inconclusive) photon subtraction is shown to enhance nonlocality of twin beams in the low energy regime. We also show that when the measurement is described by a POVM, rather than a set of projectors, the maximum achievable value of the Bell parameter in the CHSH inequality is decreased, and is no longer given by the Cirel'son bound.
arXiv comment21 Figures
References in corpus (8)
- Continuous-variable teleportation improvement by photon subtraction via conditional measurement
- Quantum Nonlocality in Phase Space
- Proposal for a loophole-free Bell test using homodyne detection
- Teleportation improvement by inconclusive photon subtraction
- Proposed Test of Quantum Nonlocality for Continuous Variables
- Degaussification of twin-beam and nonlocality in the phase space
- Photon subtracted states and enhancement of nonlocality in the presence of noise
- Direct measurement of optical quasidistribution functions: multimode theory and homodyne tests of Bell's inequalities
Cited by in corpus (23)
- Quantifying non-Gaussianity for quantum information
- Nonclassicality and decoherence of photon-subtracted squeezed states
- Convex resource theory of non-Gaussianity
- Non-Gaussianity as a signature of a quantum theory of gravity
- Entanglement and nonclassicality of photon-added two-mode squeezed thermal state
- Qudit-Teleportation for photons with linear optics
- Reliable source of conditional non-Gaussian states from single-mode thermal fields
- Conditional measurements on multimode pairwise entangled states from spontaneous parametric downconversion
- Testing Bell inequalities with photon-subtracted Gaussian states
- Non-Gaussian states produced by close-to-threshold optical parametric oscillators: role of classical and quantum fluctuations
- Consideration of success probability and performance optimization in non-Gaussian continuous variable quantum teleportation
- Multiphoton communication in lossy channels with photon-number entangled states
- Continuous-variable entanglement distillation by cascaded photon replacement
- Two proposals for testing quantum contextuality of continuous-variable states
- Engineering Quantum Jump Superoperators for Single Photon Detectors
- De-Gaussification by inconclusive photon subtraction
- Single-photon quantum nonlocality: Violation of the Clauser-Horne-Shimony-Holt inequality using feasible measurement setups
- Multiphoton Bell-type inequality: a tool to unearth nonlocality of continuous variable quantum optical systems
- Non-Gaussian state generation certified using the EPR-steering inequality
- Detecting Nonclassicality and quantum non-Gaussianity of photon subtracted displaced Fock state
- Cost-effective temperature estimation strategies for thermal states with probabilistic quantum metrology
- Analyzing the free states of one quantum resource theory as resource states of another
- Statistical properties and decoherence of two-mode photon-subtracted squeezed vacuum