Quantum eraser: A proposed photon correlation experiment concerning observation and "delayed choice" in quantum mechanics

Scully, Marlan O.; Drühl, Kai J.

doi:10.1103/physreva.25.2208

Cited by 642 publications

(595 citation statements)

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“…Would such a quantum eraser process restore the interference fringes? The answer is "yes" [3], and this has been verified experimentally [4,5]. This erasure and fringe retrieval can be achieved even after the atoms hit the screen [6].…”

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confidence: 78%

Quantum disentanglement eraser: A cavity QED implementation

2004

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A possible experimental scheme of the Garisto-Hardy disentanglement eraser based on a cavity QED system is presented. This scheme can be used for a delayed choice quantum eraser. It also allows us to acquire single-qubit control over teleportation of an arbitrary binary state. Complementarity lies at the heart of quantum mechanics [1]. A classic example is the Young's double-slit experiment in which a "particle" exhibits wavelike behavior by displaying interference if it goes through both slits. The interference disappears and a particlelike behavior is exhibited if the which-path information becomes available [2]. The question then is: What would happen if we erase the which-path information after the particle has passed through the slits? Would such a quantum eraser process restore the interference fringes? The answer is "yes" [3], and this has been verified experimentally [4,5]. This erasure and fringe retrieval can be achieved even after the atoms hit the screen [6].There is a close link between the notions of quantum eraser and entanglement. For example, in any setup for quantum eraser, the which-path information, and therefore the disappearance of the fringes, is achieved by entangling the state of the particle with another controlling qubit that contains the which-path information. One can, however, restore the fringes by erasing the which-path information contained in the controlling qubit.Garisto and Hardy [7] described an interesting new class of quantum erasers, called disentanglement eraser. These consist of at least three subsystems: A, B, and T. The AB subsystem is prepared in an entangled state, ͑1͒If the pieces of this entangled state are tagged with T, such that the state of the whole system is ͑2͒then the purity of the entanglement of the subsystem AB is lost as the state of the AB subsystem is described by the statistical mixture,However, if the tagged information is erased, then the entanglement of the AB subsystem is restored. In order to see this we define the superposition states of the tagged stateThe state of the combined ABT system (2) can then be rewritten asAn outcome ͉+ T ͘ for the tagged state therefore restores the original state (1) for the AB subsystem, whereas the outcomeA phase shift then restores the original state. Thus a measurement of tagging qubit restores the entangled state. This disentanglement eraser of Garisto and Hardy shows that "the entanglement of any two particles that do not interact (directly or indirectly), never disappears but rather is encoded in the ancilla of the system." An implementation of such eraser has been demonstrated in NMR systems [8].In this paper, we propose the usage of two high quality cavities to realize a new type of quantum eraser as proposed by Garisto and Hardy [7]. In our work, we use an auxiliary atom's passage through the first cavity to control the degree of entanglement between the two cavities. We further discuss how these changes can be studied by using a probe atom and post measurement on the auxiliary atom.We consider a system o...

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confidence: 78%

Quantum disentanglement eraser: A cavity QED implementation

2004

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“…In the present description, however, this is not a pertinent explanation. It is true that the Raman scattered light does not interfere with the reference light from the source: the respective final atomic states are orthogonal and the two amplitudes do not describe indistinguishable processes (this is a typical "which-path" argument [38,39]). But a photon scattered elastically along the direct path interferes very well with the same photon scattered along the reverse path -as long as the internal states of all atoms in both processes are identical, no matter whether they describe degenerate Raman or Rayleigh transitions.…”

Section: The Role Of Degenerate Raman Transitionsmentioning

confidence: 99%

Weak localization of light by cold atoms: The impact of quantum internal structure

et al. 2001

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Since the work of Anderson on localization, interference effects for the propagation of a wave in the presence of disorder have been extensively studied, as exemplified in coherent backscattering (CBS) of light. In the multiple scattering of light by a disordered sample of thermal atoms, interference effects are usually washed out by the fast atomic motion. This is no longer true for cold atoms where CBS has recently been observed. However, the internal structure of the atoms strongly influences the interference properties. In this paper, we consider light scattering by an atomic dipole transition with arbitrary degeneracy and study its impact on coherent backscattering. We show that the interference contrast is strongly reduced. Assuming a uniform statistical distribution over internal degrees of freedom, we compute analytically the single and double scattering contributions to the intensity in the weak localization regime. The so-called ladder and crossed diagrams are generalized to the case of atoms and permit to calculate enhancement factors and backscattering intensity profiles for polarized light and any closed atomic dipole transition.

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“…In 1982, Scully and Drühl [14] did not suggest the use of entangled particles in any aspect of their proposed experiment. In 2012, Menzel et al [10] reported an experiment in which they inferred the traversed slit by means of the entangled particle and still Menzel et al [10] clearly state on p. 9314 that the entangled particles are crucial to ascertaining the traversed slit: "In the present paper we report the results of a double-slit experiment that brings out an additional layer of this principle.…”

Section: Origin Of Entangled Quantum Particle Pairs From the Sourcementioning

confidence: 99%

Challenges to Bohr’s Wave-Particle Complementarity Principle

Rabinowitz¹

2012

Int J Theor Phys

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Contrary to Bohr's complementarity principle, in 1995 Rabinowitz proposed that by using entangled particles from the source it would be possible to determine which slit a particle goes through while still preserving the interference pattern in the Young's two slit experiment. In 2000, Kim et al used spontaneous parametric down conversion to prepare entangled photons as their source, and almost achieved this. In 2012, Menzel et al. experimentally succeeded in doing this. When the source emits entangled particle pairs, the traversed slit is inferred from measurement of the entangled particle's location by using triangulation. The violation of complementarity breaches the prevailing probabilistic interpretation of quantum mechanics, and benefits Bohm's pilot-wave theory.

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Quantum eraser: A proposed photon correlation experiment concerning observation and "delayed choice" in quantum mechanics

Cited by 642 publications

References 3 publications

Quantum disentanglement eraser: A cavity QED implementation

Quantum disentanglement eraser: A cavity QED implementation

Weak localization of light by cold atoms: The impact of quantum internal structure

Challenges to Bohr’s Wave-Particle Complementarity Principle

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