QUDL
Quantum detection, calibrated.
QUDL is a calibration method that converts theoretical detection predictions into absolute detector counts, and carries that calibration across platforms and operating regimes.
Simulation-stage. Patent pending, GB2613829.7.
The problem
Quantum theory predicts ratios. Instruments produce counts.
Detection theory gives dimensionless predictions. Your instrument gives a number on a screen. Bridging the two is done differently in every laboratory, with scaling factors fitted per instrument, per run, and rarely transferable to the next detector or the next regime.
The result is familiar to anyone who runs detectors:
The method
One calibration coefficient, carried across platforms.
QUDL introduces a calibration coefficient, κ_M: a single detector- and readout-specific constant determined once, which converts dimensionless amplitude predictions into absolute counts per gate.
The calibration is part of the detection model rather than fitted afterwards. The detector's acceptance window, its efficiency, and the readout chain are all inside the calculation from the start.
Absolute counts
Predictions in counts per gate, not relative signals, so results are comparable across devices and sites.
Transferable calibration
κ_M is defined so it can be carried between operating regimes and detector platforms with the geometry and gain factors made explicit.
Drift you can track
κ_M is monitored over time rather than assumed constant, so recalibration is scheduled on evidence.
Stated uncertainty
Calibration uncertainty propagates through to the prediction, which matters for audit and certification.
Consistent across regimes
One formulation from the single-photon regime through to saturation.
QUDL recovers the established limits (Glauber photodetection, Lindblad dynamics, S-matrix scattering) under their standard conditions. It is a calibration method built on that foundation, not a replacement for it.
Watch the full calibration workflow as a narrated illustrative walkthrough, from specifying the instrument to carrying the same calibration onto a second detector platform. QUDL is validated in simulation and not yet on hardware.
Watch how QUDL worksWhere it applies
A portable calibration across detector platforms
Quantum computing
Readout calibration that holds across operating conditions rather than being retuned for each one.
Medical imaging (PET)
Sharper separation of signal from background, with the potential to hold image quality at lower dose.
Quantum communications and QKD
Absolute-referenced receivers and simpler cross-vendor alignment.
Metrology and standards
Traceable, comparable detector characterisation across platforms.
LiDAR and time-of-flight
Cleaner returns in difficult conditions.
Aerospace, astronomy, semiconductor inspection
Faint-light and low-count detection with a portable absolute reference.
Where we are
Honest about the stage.
QUDL is validated in simulation, including against an independent Lindblad (QuTiP) ground truth. It has not yet been validated on hardware or in a clinical setting.
That is the next step, and it is the step we are looking for partners on. The framework is filed (GB2613829.7), independently assessed for IP position and commercial potential, and ready to be tested against real instruments.
We would rather tell you that plainly than overstate it.
Work with us
We are seeking:
Validation partners
Research groups and instrument makers with detector hardware, interested in testing QUDL predictions against measurement and co-authoring the result.
OEM and clinical partners
Particularly in PET imaging, where the coincidence discrimination work is furthest along.
R&D collaborators
Quantum computing and photonics groups where readout calibration is a live constraint.
Whatever the outcome, the findings are publishable. A method that turns out to have limits is still worth knowing about.
contact@physivitis.tech
Partnership enquiry
Tell us about your detector platform.
Share a few details and we will get back to you to scope a validation together. Whatever the outcome, the findings are publishable.
QUDL is a calibration method for quantum detection. Patent pending, GB2613829.7. Simulation-stage; seeking hardware, clinical and OEM validation partners.