Entanglement and phase properties of noisy N00N states
arXiv:1412.3321 · doi:10.1103/PhysRevA.91.042332
Abstract
Quantum metrology and quantum information necessitate a profound study of suitable states. Attenuations induced by free-space communication links or fluctuations in the generation of such states limit the quantum enhancement in possible applications. For this reason we investigate quantum features of mixtures of so-called N00N states propagating in atmospheric channels. First, we show that noisy N00N states can still yield a phase resolution beyond classical limitations. Second, we identify entanglement of noisy N00N states after propagation in fluctuating loss channels. To do so, we apply the partial transposition criterion. Our theoretical analysis formulates explicit bounds which are indispensable for experimental verification of quantum entanglement and applications in quantum metrology.
References in corpus (9)
- Free-Space distribution of entanglement and single photons over 144 km
- Using entanglement against noise in quantum metrology
- Mach-Zehnder Interferometry at the Heisenberg Limit with coherent and squeezed-vacuum light
- High-fidelity transmission of entanglement over a high-loss freespace channel
- Entanglement of Gaussian states and the applicability to quantum key distribution over fading channels
- Phase estimation without a priori knowledge in the presence of loss
- Quantum light in the turbulent atmosphere
- High photon number path entanglement in the interference of spontaneously downconverted photon pairs with coherent laser light
- Feasibility of free space quantum key distribution with coherent polarization states