The Delayed-Choice Quantum Eraser Leaves No Choice

Qureshi, Tabish

doi:10.1007/s10773-021-04906-w

Cited by 13 publications

(9 citation statements)

References 40 publications

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“…A driving photon pulse d 1 enters the symmetric beam splitter BS in and impinges either of the two atoms. 8 The photon d 1 excites one of the atoms and trigger it to emit a photon γ s , which travels along Path 1 7 In [33], it is claimed that "the delayed-choice quantum eraser leaves no choice" in a particular situation that is equivalent to the configuration with θ1 = π/2, φ1 = π/2 considered in this paper. In this situation, because each individual γs registered in D± corresponds to the initial state…”

Section: A the Setupmentioning

confidence: 94%

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

Chiou¹

2022

Preprint

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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 the Einstein-Podolsky-Rosen-Bohm (EPR-Bohm) experiment. Therefore, the effect of quantum erasure can be understood in terms of the standard EPR correlation.Nevertheless, the quantum eraser still raises a conceptual issue beyond the standard EPR paradox, if counterfactual reasoning is taken into account. Furthermore, the quantum eraser experiments can be classified into two major categories: the entanglement quantum eraser and the Scully-Drühl-type quantum eraser. These two types are formally equivalent to each other, but conceptually the latter presents a "mystery" more prominent than the former. In the Scully-Drühl-type quantum eraser, the statement that the which-way information can be influenced by the delayed-choice measurement is not purely a consequence of counterfactual reasoning but bears some factual significance. Accordingly, it makes good sense to say that the "record" of the which-way information is "erased" if the potentiality to yield a conclusive outcome that discriminates the record is eliminated by the delayed-choice measurement. We also reconsider the quantum eraser in the many-worlds interpretation (MWI), making clear the conceptual merits and demerits of the MWI.

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Section: A the Setupmentioning

confidence: 94%

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

Chiou¹

2022

Preprint

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“…If the switch speed is not a concern, one can simply replace the EOM with a half-wave plate that rotates the input polarization by 45 • for the closed configurations, and remove the half-wave plate for the open configuration. The arrangement devised to recombine the two paths can alternatively be replaced by the method proposed in Figure 1 in [29].…”

Section: A Simple Model Of a Delayed-choice Quantum Erasermentioning

confidence: 99%

“…The same idea of using a Mach-Zehnder interferometer for the delayed-choice quantum eraser has been considered in the literature (see e.g.,[28,29]). Particularly, our setup in Fig.1is very similar to Figure1in[29], except that the latter investigates a different issue and does not consider an adjustable phase shift 2. The adjustable phase shift θ can also be realized by tilting the second beam splitter.…”

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confidence: 99%

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

Chiou¹,

Hsu²

2022

Preprint

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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 to test complementarity relations between interference visibility and whichway distinguishability in the scenario that the which-way information is obtained through entanglement without direct contact with the quantum state for interference. The visibilitydistinguishability relations are investigated from three perspectives that differ in how the which-way information is taken into consideration. These complementarity relations can be understood in terms of entropic uncertainty relations in the information-theoretic framework and the triality relation that incorporates single-particle and bipartite properties. We then perform experiments on the quantum computers provided by the IBM Quantum platform to verify the theoretical predictions. We also apply the delay gate to delay the measurement of the which-way information to affirm that the measurement can be made truly in the "delayed-choice" manner.

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“…It is worth stressing that the measurement outcome on the screen does not depend on the settings on the other path, that is, whether the eraser is on or off does not affect the outcome on the screen. It's just that one can sample the photons in two different groups in two different ways [23,34,52,53].…”

Section: The Quantum Erasermentioning

confidence: 99%

The Quantum Eraser Paradox

Bracken¹,

Hance²,

Hossenfelder³

2021

Preprint

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The Delayed-Choice Quantum Eraser experiment is commonly interpreted as implying that in quantum mechanics a choice made at one time can influence an earlier event. We here suggest an extension of the experiment that results in a paradox when interpreted using a local realist interpretation combined with backward causation ("retrocausality"). We argue that resolving the paradox requires giving up the idea that, in quantum mechanics, a choice can influence the past, and that it instead requires a violation of Statistical Independence without retrocausality. We speculate what the outcome of the experiment would be.

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The Delayed-Choice Quantum Eraser Leaves No Choice

Cited by 13 publications

References 40 publications

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

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

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

The Quantum Eraser Paradox

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