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Open access
Sep 2026
Multipath wave–particle duality with exact quantification of which-path knowledge
A quantum system (quanton) traverses an interferometer with N equally probable paths and interacts with another quantum system (detector) that stores path information in a set of symmetric states. In this interferometric framework, we present a systematic quantitative study of wave–particle duality based on entropic tr...
L. Melo, O. Jiménez, L. Neves
· New Journal of Physics · 0 citations
Open access
Oct 2026
Asymmetric local label interference with polarization-entangled photon pairs: block-averaged spatial structure in unconditional detection records
We analyze a concrete local quantum-optical measurement architecture for polarization-entangled photon pairs in which Bob coherently maps polarization onto an additional path degree of freedom that functions as a local quantum label. Within an explicit loss-inclusive POVM model that includes no-detection events, and wi...
L. Szabó, P. Maák
· EPJ Quantum Technology · 0 citations
Preprint
Sep 2026
Limits for molecular spectroscopy from quantum channel discrimination
Absorption spectroscopy identifies molecules by detecting frequency-dependent optical loss, and its fundamental limit is a quantum channel-discrimination problem. In this work, we develop a general framework for characterizing the ultimate quantum limit of molecular absorption spectroscopy without collective measuremen...
Anirban Dey, Akib Karim, P. Kok et al.
· 0 citations
Preprint
Oct 2026
Decoy-state optical quantum information processing with coherent states
Photonic qubits play an important role in quantum information processing. However, to date, efficient high-speed single photon sources and photon number resolving (PNR) detectors are still difficult to make. Here, we use phase-randomized coherent states and threshold detectors, combined with decoy-state post-processing...
Wen-Yuan Wang, H. Chau
· 0 citations
Preprint
Sep 2026
Critical quantum metrology in the output of an optical parametric oscillator
Many quantum sensors infer parameters from continuously emitted fields, yet in the presence of unmonitored loss, it is difficult to determine how much critical enhancement survives in the accessible output. In this work, we calculate the full frequency-resolved output quantum Fisher information (QFI) of a stationary va...
P. Blinova, Kai Wang
· 1 citation
Preprint
Sep 2026
Quantum-Enhanced Phase Estimation with Photon-Added Even and Odd Coherent States in an SU(1,1) Interferometer
We investigate phase estimation in an SU(1,1) interferometer employing $m$-photon-added even and odd coherent states as nonclassical input resources. The phase sensitivity is evaluated through intensity detection and the error propagation method, while the ultimate precision limit is determined from the quantum Cram\'e...
Abdelmajid El Maaroufi, M. A. Maskour, B. Maroufi et al.
· 0 citations