# Afshar’s Experiment Does Not Show a Violation of Complementarity

@article{Steuernagel2005AfsharsED, title={Afshar’s Experiment Does Not Show a Violation of Complementarity}, author={Ole Steuernagel}, journal={Foundations of Physics}, year={2005}, volume={37}, pages={1370-1385} }

Abstract
A recent experiment performed by S. Afshar [first reported by M. Chown, New Sci. 183:30, 2004] is analyzed. It was claimed that this experiment could be interpreted as a demonstration of a violation of the principle of complementarity in quantum mechanics. Instead, it is shown here that it can be understood in terms of classical wave optics and the standard interpretation of quantum mechanics. Its performance is quantified and it is concluded that the experiment is suboptimal in the…

## 29 Citations

Complementarity Paradox Solved: Surprising Consequences

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- 2010

Afshar et al. claim that their experiment shows a violation of the complementarity inequality. In this work, we study their claim using a modified Mach-Zehnder setup that represents a simpler version…

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Some modified two-slit interference experiments claim to demonstrate a violation of Bohr’s complementarity principle. A typical such experiment is theoretically analyzed using wave-packet dynamics.…

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Numerical simulations of the double slit experiment with el ectrons, done by Al Rabeh, are repeated and improved. As well, the simulations go from m oved Coulomb charges. These tests are extended…

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## References

SHOWING 1-10 OF 39 REFERENCES

Complementarity in the double-slit experiment: Quantum nonseparability and a quantitative statement of Bohr's principle

- Physics
- 1979

A detailed analysis of Einstein's version of the double-slit experiment, in which one tries to observe both wave and particle properties of light, is performed. Quantum nonseparability appears in the…

Paradox in Wave-Particle Duality

- Physics
- 2007

We report on the simultaneous determination of complementary wave and particle aspects of light in a double-slit type “welcher-weg” experiment beyond the limitations set by Bohr’s Principle of…

Path detection and the uncertainty principle

- PhysicsNature
- 1994

QUANTUM mechanics predicts that any detector capable of determining the path taken by a particle through a double slit will destroy the interference. This follows from the principle of…

Decoherence due to the geometric phase in a "welcher-weg" experiment.

- PhysicsPhysical review letters
- 1992

We describe a new version of the well-known gedanken experiments to determine which of the two paths a particle took in a two-beam interference experiment. In this version the presence of a geometric…

Loss of coherence in interferometry.

- PhysicsPhysical review. A, Atomic, molecular, and optical physics
- 1993

A unified treatment of a number of double-slit experiments which give «which-path» information shows that the loss of coherence may always be described in terms of a stochastic disturbance to the system due to coupling with the path detector.

Generalized absorber theory and the Einstein-Podolsky-Rosen paradox

- Physics
- 1980

A generalized form of Wheeler-Feynman absorber theory is used to explain the quantum-mechanical paradox proposed by Einstein, Podolsky, and Rosen (EPR). The advanced solutions of the electromagnetic…

Quantum optical tests of complementarity

- PhysicsNature
- 1991

Simultaneous observation of wave and particle behaviour is prohibited, usually by the position–momentum uncertainty relation. New detectors, constructed with the aid of modern quantum optics, provide…

Quantum statistics can suppress classical interference

- Physics
- 2001

Classical optical interference experiments correspond to a measurement of the first-order correlation function of the electromagnetic field. The converse of this statement: experiments that measure…

Fringe Visibility and Which-Way Information: An Inequality.

- PhysicsPhysical review letters
- 1996

An inequality is derived according to which the fringe visibility in a two-way interferometer sets an absolute upper bound on the amount of which-way information that is potentially stored in a…

Quantum theory and measurement

- Physics
- 1983

The forty-nine papers collected here illuminate the meaning of quantum theory as it is disclosed in the measurement process. Together with an introduction and a supplemental annotated bibliography,…