Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physical Review A

Reply to “Comment on ‘Effect of entanglement on the decay dynamics of a pair of H( 2p ) atoms due to spontaneous emission’ ”

Takehiko Tanabe, Takeshi Odagiri, M. Nakano, Yoshiaki Kumagai, Isao Suzuki, M. Kitajima, Noriyuki Kouchi

Published Jun 13, 2011• 3 citations
Publisher

Abstract

In this Reply to the preceding Comment by Sancho and Plaja, we point out the difference between the coincidence time spectrum of two Lyman-$\ensuremath{\alpha}$ photons measured by us and their theoretical one.

DOI
10.1103/physreva.83.066102

Related papers

Comment on “Effect of entanglement on the decay dynamics of a pair of H(2 p ) atoms due to spontaneous emission”

Pedro Sancho, Luis Plaja

T. Tanabe et al. [Phys. Rev. A 82, 040101(R) (2010)] have experimentally demonstrated that the emission properties of unstable atoms in entangled and product states are different. The authors define an apparent decay time as a fitting parameter which falls below the lifetime of the single atom for entangled pairs. We argue that their results about coincidence time spectra are correct, but those concerning lifetimes cannot be considered conclusive because they assume the emission of photons by the two atoms to be independent processes, a doubtful hypothesis for entangled states. We suggest an improved evaluation of the lifetimes based on a rigorous approach, which demands some modifications of the experimental procedure.

arXiv:1106.2667•Physical Review A•Jun 13, 2011•8 citations

Effect of entanglement on the decay dynamics of a pair of H( 2p ) atoms due to spontaneous emission

Takehiko Tanabe, Takeshi Odagiri, M. Nakano +4 more

We have measured the coincidence time spectra of two Lyman-$\ensuremath{\alpha}$ photons emitted by a pair of H($2p$) atoms in the photodissociation of ${\text{H}}_{2}$ at the incident photon energy of 33.66 eV and at the hydrogen gas pressures of 0.40 and 0.02 Pa. The decay time constant at 0.02 Pa is approximately half the lifetime of a single H($2p$) atom, 1.60 ns, while the decay time constant at 0.40 Pa is in agreement with the lifetime of a single H($2p$) atom. It turns out that the decay faster than the lifetime of a single H($2p$) atom originates from the entanglement in the pair of H($2p$) atoms. We have demonstrated an effect of entanglement on atomic decay.

Physical Review A•Oct 20, 2010•24 citations

Dynamics of entangled H(2p) pair generated in the photodissociation of H2

Takeshi Odagiri, Takehiko Tanabe, Noriyuki Kouchi

We have measured the coincidence time spectra of two Lyman-α photons emitted by a pair of H(2p) atoms in the photodissociation of H 2 at the incident photon energy of 33.66 eV and at the hydrogen gas pressures of 0.40 Pa and 0.02 Pa, from which the angular distributions of two Lyman-α photons have been obtained. The experimental angular distributions indicate the generation of the entangled pair of H(2p) atoms as predicted by the theory of our group (Miyagi et al 2007 J. Phys. B 40 617) and the role of a new kind of reaction, i.e. the reaction of the entangled pair of H(2p) atoms with an H 2 molecule that efficiently changes the entanglement. It has turned out that more entangled pairs of H(2p) atoms survive at 0.02 Pa than at 0.40 Pa. The decay time constant in the coincidence time spectrum at 0.02 Pa is approximately half the lifetime of a single H(2p) atom, 1.60 ns, while the decay time constant at 0.40 Pa is in agreement with the lifetime of a single H(2p) atom. It follows that the decay faster than the lifetime of a single H(2p) atom originates from the entanglement in the pair of H(2p) atoms.

Journal of Physics Conference Series•Nov 5, 2012•5 citations

Effect of entanglement on the decay dynamics of a pair of H(2p) atoms due to spontaneous emission

健彦 田邊, Takehiko Tanabe, 丈 小田切 +9 more

•Oct 1, 2010•0 citations

Absence of entanglement effect on the decay dynamics of H(2p) pairs produced by VUV photodissociation of H2

Xavier Urbain, Arnaud Dochain, Clément Lauzin +1 more

The effects of entanglement on the spontaneous decay of a pair of H(2 p ) previously observed by Tanabe et al. ( Phys. Rev. A 82 , 040101 (2010)) could not be reproduced despite careful determination of emission times with respect to the synchrotron bunch.

Journal of Physics Conference Series•Sep 7, 2015•5 citations

Large pressure effect on the angular distribution of two Lyman-α photons emitted by an entangled pair of H(2p) atoms in the photodissociation of H_2_

健彦 田邊, Takehiko Tanabe, 丈 小田切 +7 more

•Oct 1, 2009•0 citations
In this Reply to the preceding Comment by Sancho and Plaja, we point out the difference between the coincidence time spectrum of two Lyman-\ensuremathα\ensuremath{\alpha}\ensuremathα photons measured by us and their theoretical one.
T. Tanabe et al. [Phys. Rev. A 82, 040101(R) (2010)] have experimentally demonstrated that the emission properties of unstable atoms in entangled and product states are different. The authors define an apparent decay time as a fitting parameter which falls below the lifetime of the single atom for entangled pairs. We argue that their results about coincidence time spectra are correct, but those concerning lifetimes cannot be considered conclusive because they assume the emission of photons by the two atoms to be independent processes, a doubtful hypothesis for entangled states. We suggest an improved evaluation of the lifetimes based on a rigorous approach, which demands some modifications of the experimental procedure.
We have measured the coincidence time spectra of two Lyman-$\ensuremath{\alpha}$ photons emitted by a pair of H(2p2p2p) atoms in the photodissociation of H2{\text{H}}_{2}H2​ at the incident photon energy of 33.66 eV and at the hydrogen gas pressures of 0.40 and 0.02 Pa. The decay time constant at 0.02 Pa is approximately half the lifetime of a single H(2p2p2p) atom, 1.60 ns, while the decay time constant at 0.40 Pa is in agreement with the lifetime of a single H(2p2p2p) atom. It turns out that the decay faster than the lifetime of a single H(2p2p2p) atom originates from the entanglement in the pair of H(2p2p2p) atoms. We have demonstrated an effect of entanglement on atomic decay.
We have measured the coincidence time spectra of two Lyman-α photons emitted by a pair of H(2p) atoms in the photodissociation of H 2 at the incident photon energy of 33.66 eV and at the hydrogen gas pressures of 0.40 Pa and 0.02 Pa, from which the angular distributions of two Lyman-α photons have been obtained. The experimental angular distributions indicate the generation of the entangled pair of H(2p) atoms as predicted by the theory of our group (Miyagi et al 2007 J. Phys. B 40 617) and the role of a new kind of reaction, i.e. the reaction of the entangled pair of H(2p) atoms with an H 2 molecule that efficiently changes the entanglement. It has turned out that more entangled pairs of H(2p) atoms survive at 0.02 Pa than at 0.40 Pa. The decay time constant in the coincidence time spectrum at 0.02 Pa is approximately half the lifetime of a single H(2p) atom, 1.60 ns, while the decay time constant at 0.40 Pa is in agreement with the lifetime of a single H(2p) atom. It follows that the decay faster than the lifetime of a single H(2p) atom originates from the entanglement in the pair of H(2p) atoms.