# The ‘Delayed Choice Quantum Eraser’ Neither Erases Nor Delays

@article{Kastner2019TheC, title={The ‘Delayed Choice Quantum Eraser’ Neither Erases Nor Delays}, author={Ruth E. Kastner}, journal={Foundations of Physics}, year={2019}, pages={1-11} }

It is demonstrated that ‘quantum eraser’ (QE) experiments do not erase any information. Nor do they demonstrate ‘temporal nonlocality’ in their ‘delayed choice’ form, beyond standard EPR correlations. It is shown that the erroneous erasure claims arise from assuming that the improper mixed state of the signal photon physically prefers either the ‘which way’ or ‘both ways’ basis, when no such preference is warranted. The latter point is illustrated through comparison of the QE spatial state…

## 12 Citations

### Delayed-choice quantum erasers and the Einstein-Podolsky-Rosen paradox

- Physics
- 2022

Considering the delayed-choice quantum eraser using a Mach-Zehnder interferometer with a nonsymmetric beam splitter, we explicitly demonstrate that it shares exactly the same formal structure with…

### Delayed-choice quantum erasers and the Einstein-Podolsky-Rosen paradox

- Physics
- 2022

Considering the delayed-choice quantum eraser using a Mach-Zehnder interferometer with a nonsymmetric beam splitter, we explicitly demonstrate that it shares exactly the same formal structure with…

### Taming the Delayed Choice Quantum Eraser

- PhysicsQuanta
- 2019

I discuss the delayed choice quantum eraser experiment by drawing an analogy to a Bell-type measurement and giving a straightforward account in standard quantum mechanics. The delayed choice quantum…

### The Delayed-Choice Quantum Eraser Leaves No Choice

- PhysicsInternational Journal of Theoretical Physics
- 2021

A realizable delayed-choice quantum eraser, using a modified Mach-Zehnder (MZ) interferometer and polarization entangled photons, is theoretically analyzed here. The signal photon goes through a…

### Demystifying the delayed-choice quantum eraser

- PhysicsEuropean Journal of Physics
- 2020

The delayed-choice quantum eraser has long been a subject of controversy, and has been looked at as being incomprehensible to having retro-causal effect in time. Here the delayed-choice quantum…

### The Vienna Delayed-Choice Quantum Eraser Leaves No Choice

- Physics
- 2020

A realizable delayed-choice quantum eraser, using a modified Mach-Zehnder (MZ) interferometer and polarization entangled photons, is theoretically analyzed here. The signal photon goes through a…

### Macroscopic delayed-choice and retrocausality: quantum eraser, Leggett-Garg and dimension witness tests with cat states

- Physics
- 2021

We propose delayed choice experiments carried out with macroscopic qubits, realised as macroscopically-distinct coherent states |α〉 and | − α〉. Quantum superpositions of |α〉 and | − α〉 are created…

### Complementarity relations of a delayed-choice quantum eraser in a quantum circuit

- Physics
- 2022

We propose a quantum circuit that emulates a delayed-choice quantum eraser via bipartite entanglement with the extension that the degree of entanglement is adjustable. This provides a broader setting…

### On delayed choice and quantum erasure in two-slit experiment for testing complementarity

- PhysicsJournal of Physics Communications
- 2021

The principle of complementarity is one of the cornerstones of quantum theory. The aim of this study was to advance our understanding of complementarity by analyzing the role of delayed choice and…

### Can Quantum Correlations Lead to Violation of the Second Law of Thermodynamics?

- PhysicsEntropy
- 2021

A technical discussion of the expected results on the role of quantum entanglement in thermodynamics and quantum correlations cannot lead to a violation of the second law of thermodynamics in any of its formulations.

## References

SHOWING 1-6 OF 6 REFERENCES

### Quantum erasure with causally disconnected choice

- PhysicsProceedings of the National Academy of Sciences
- 2013

A quantum eraser experiment in which, by enforcing Einstein locality, no such communication is possible by independent active choices, which are space-like separated from the interference.

### Double-slit quantum eraser

- Physics
- 2002

We report a quantum eraser experiment which actually uses a Young double slit to create interference. The experiment can be considered an optical analogy of an experiment proposed by Scully, Englert,…

### Why delayed choice experiments do Not imply retrocausality

- Physics
- 2015

Although retrocausality might be involved in quantum mechanics in a number of ways, the focus here is on the delay-choice arguments popularized by John Archibald Wheeler. There is a common fallacy…

### Probability relations between separated systems

- PhysicsMathematical Proceedings of the Cambridge Philosophical Society
- 1936

The paper first scrutinizes thoroughly the variety of compositions which lead to the same quantum-mechanical mixture (as opposed to state or pure state). With respect to a given mixture every state…

### The Structure and Interpretation of Quantum Mechanics

- Physics
- 1989

Preface Introduction. The Stern-Gerlach Experiment PART I THE STRUCTURE OF QUANTUM THEORY 1. Vector Spaces Vectors Operators Eigenvectors and Eigenvalues Inner Products of Vectors in R2 Complex…

### Delayed "Choice" quantum eraser

- PhysicsPhysical review letters
- 2000

The experimental results demonstrate the possibility of delayed determination of particlelike or wavelike behavior via quantum entanglement, and the which-path or both-path information of a quantum can be marked or erased by its entangled twin even after the registration of the quantum.