# An application of two-photon entangled states to quantum metrology

@article{Brida2000AnAO, title={An application of two-photon entangled states to quantum metrology}, author={Giorgio Brida and Marco Genovese and Carlo Novero}, journal={Journal of Modern Optics}, year={2000}, volume={47}, pages={2099 - 2104} }

Abstract Besides many interesting applications to the study of the foundations of quantum mechanics, entangled states are now assuming much relevance for some practical applications. In particular, we discuss the use of two-photon entangled states produced in parametric down conversion for absolute quantum efficiency calibration of photodetectors, in the photon counting regime.

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## References

SHOWING 1-10 OF 15 REFERENCES

Absolute measurement of detector quantum efficiency using parametric downconversion.

- PhysicsApplied optics
- 1987

We show that a parametric downconversion crystal emitting angle resolved coincident photon pairs can be used to measure the absolute quantum efficiency of a photon counting detection system. We have…

On the measurement of photon flux in parametric down-conversion

- Physics
- 1999

We report the measurement of the photons flux produced in parametric down-conversion, performed in photon counting regime with actively quenched silicon avalanche photodiodes as single photon…

Use of two-photon light for absolute calibration of photoelectric detectors

- Physics
- 1980

A description is given of a method for calibrating photodetectors based on some characteristics of the statistics of the field of spontaneous parametric light scattering. A phenomenological theory of…

Absolute standardless calibration of photodetectors based on quantum two-photon fields.

- PhysicsApplied optics
- 1991

A new method of absolute calibration of photodetectors based on a nonclassical effect in nonlinear optics is discussed and the feasibility of the method is demonstrated on different types of photomultiplier tube.

Spatiotemporal coherence properties of entangled light beams generated by parametric down-conversion.

- PhysicsPhysical review. A, Atomic, molecular, and optical physics
- 1994

It is shown that the down-converted light is spatially incoherent in the second order, and that the signal-idler fourth-order coherence extends over finite entanglement angles.

Absolute efficiency and time-response measurement of single-photon detectors.

- PhysicsApplied optics
- 1994

Using correlated photons from spontaneous parametric downconversion, both the absolute quantum efficiencies and the time responses of four single-photon detectors are measured and the presence of afterpulses and the effects of saturation and varying device parameters are investigated.

Measurement of the quantum efficiency of photodetectors by parametric fluorescence

- Physics
- 1998

An experimental setup has been developed at the Istituto Elettrotecnico Nazionale G. Ferraris (IEN) for the absolute calibration of photodetectors in the photon-counting regime by means of correlated…

Absolute detector quantum-efficiency measurements using correlated photons

- Physics, Environmental Science
- 1995

An experimental system using correlated photons for radiometric purposes has been set up at the National Institute of Standards and Technology (NIST). We use pairs of correlated photons to produce…

Optical Coherence and Quantum Optics

- Physics
- 1995

Preface 1. Elements of probability theory 2. Random (or stochastic) processes 3. Some useful mathematical techniques 4. Second-order coherence theory of scalar wavefields 5. Radiation from sources of…

Photon counting techniques with silicon avalanche photodiodes.

- PhysicsApplied optics
- 1993

The properties of avalanche photodiodes and associated electronics required for photon counting in the Geiger and the sub-Geiger modes are reviewed and significant improvements reported in overall photon detection efficiencies and a timing jitter are reported.