Realization of a causal-modeled delayed-choice experiment using single photons

Yu, Shang; Sun, Yong-Nan; Liu, Wei; Liu, Zhao‐Di; Ke, Zhi‐Jin; Wang, Yi Tao; Tang, Jian‐Shun; Li, Chuan‐Feng; Guo, Guang‐Can

doi:10.1103/physreva.100.012115

Cited by 20 publications

(7 citation statements)

References 27 publications

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“…We next follow the approach of Chaves, Lemos and Pienaar (CLP) [26], by demonstrating violation of the dimension witness inequality [27,[58][59][60][61][62]. Here, one considers two-dimensional models and, within this framework, confirms the failure of all non-retrocausal models.…”

Section: Dimension Witness Testmentioning

confidence: 88%

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

Thenabadu,

Reid

2021

Preprint

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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 via a unitary interaction U (θ) based on a nonlinear Hamiltonian, in analogy with polarising beam splitters used in photonic experiments. Macroscopic delayed-choice experiments give a compelling reason to develop interpretations not allowing macroscopic retrocausality (MrC). We therefore consider weak macroscopic realism (wMR), which specifies a hidden variable λ θ to determine the macroscopic qubit value (analogous to 'which-way' information), independent of any future measurement setting φ. Using entangled cat states, we demonstrate a quantum eraser where the choice to measure a which-way or wave-type property is delayed. Consistency with wMR is possible, if we interpret the macroscopic qubit value to be determined by λ θ without specification of the state at the level of order , where fringes manifest. We then demonstrate violations of a delayed-choice Leggett-Garg inequality, and of the dimension witness inequality applied to the Wheeler-Chaves-Lemos-Pienaar experiment, where measurements need only distinguish the macroscopic qubit states. This negates all two-dimensional non-retrocausal models, thereby suggesting MrC. However, one can interpret consistently with wMR, thus avoiding conclusions of MrC, by noting extra dimensions, and by noting that the violations require further unitary dynamics U for each system. The violations are then explained as failure of deterministic macroscopic realism (dMR), which specifies validity of λ θ prior to the dynamics U (θ) determining the measurement setting θ. Finally, although there is consistency with wMR for macroscopic observations, we demonstrate Einstein-Podolsky-Rosen-type paradoxes at a microscopic level, based on fringe distributions.

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Section: Dimension Witness Testmentioning

confidence: 88%

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

Thenabadu,

Reid

2021

Preprint

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“…1(b), individual coherence time τ 𝑖𝑖 of each entangled photon pair should be much longer than the effective coherence time 𝜏𝜏 0 (= Δ −1 ) of the ensemble, i.e., τ 𝑖𝑖 ≫ 𝜏𝜏 0 [12,18,22]. This coherence condition beyond the space-like separation is thus the dilemma of the present coherence approach, which has not been yet considered carefully in the quantum information community [1][2][3][6][7][8][9][10][11][12][13][14][15][16][17][18]. Thus, such a coherence condition between local detectors by D0 and D1 in Eq.…”

Section: Discussionmentioning

confidence: 99%

“…For this, various kinds of photons and measurement techniques have been used to understand quantum mechanics [6][7][8][9][10]. For the quantum eraser, the violation of classical physics, i.e., violation of causality has been tested using delayed-choice measurements whose delay between the cause and effect events meets the space-like separation [11][12][13][14][15]. In both cases of the delayed-choice and quantum eraser, the minimum condition of a light source is a single photon or an equivalent entity to work with the wave-particle duality.…”

Section: Introductionmentioning

confidence: 99%

Coherence interpretations of nonlocal quantum correlation based on a quantum eraser

Ham

2022

Preprint

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Bell inequality violation is a quantitative measurement tool of quantum entanglement between space-like separated particles. Quantum entanglement is the heart of quantum information science, in which the resulting nonlocal correlation between the paired particles is a unique property of quantum mechanics. Over the last few decades, intensive research has been conducted to understand nonlocal quantum features based on the particle nature of quantum mechanics. Here, the role of coincidence detection is analyzed in a simple interferometer using a quantum eraser. To understand the nonlocal quantum feature, coincidence detection between two output photons of an interferometer is coherently analyzed for Bell inequality violations. Based on this understanding, a classical model of the nonlocal quantum correlation is finally presented using coherent light via wave mixing and heterodyne detection.

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“…Besides the applications to quantum metrology and in general to quantum information tasks, a MZI can be also the testbed for foundational tests, like those exploring waveparticle duality of photons [256][257][258][259][260][261][262][263][264] or even quantum gravity phenomena when the probes are massive systems [265][266][267] .…”

Section: A Phase Estimation Problemmentioning

confidence: 99%

Photonic Quantum Metrology

Polino¹,

Valeri²,

Spagnolo³

et al. 2020

Preprint

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Quantum Metrology is one of the most promising application of quantum technologies. The aim of this research field is the estimation of unknown parameters exploiting quantum resources, whose application can lead to enhanced performances with respect to classical strategies. Several physical quantum systems can be employed to develop quantum sensors, and photonic systems represent ideal probes for a large number of metrological tasks. Here we review the basic concepts behind quantum metrology and then focus on the application of photonic technology for this task, with particular attention to phase estimation. We describe the current state of the art in the field in terms of platforms and quantum resources. Furthermore, we present the research area of multiparameter quantum metrology, where multiple parameters have to be estimated at the same time. We conclude by discussing the current experimental and theoretical challenges, and the open questions towards implementation of photonic quantum sensors with quantum-enhanced performances in the presence of noise.

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Realization of a causal-modeled delayed-choice experiment using single photons

Cited by 20 publications

References 27 publications

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

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

Coherence interpretations of nonlocal quantum correlation based on a quantum eraser

Photonic Quantum Metrology

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