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

arXiv:nucl-ex/0411050

Remote Stimulated Triggering of Quantum Entangled Nuclear Metastable States of 115mIn

Daniel L. Van Gent

Published Nov 24, 2004• 2 citations
arXivHTMLPDF

Abstract

We report experiments in which two indium foils were quantum entangled via photoexcitation of stable 115In to radioactive 115mIn by utilizing Bremsstrahlung gamma photons produced by a Varian Compact Linear Accelerator (CLINAC). After photo-excitation, remote triggering of the "master" foil with low energy gamma photons, yielded stimulated emissions of 336 keV gamma photons from quantum entangled 115mIn in the "slave" foil located up to 1600 m away from the "master" foil. These experiments strongly demonstrate that useful quantum information can be transferred through quantum channels via modulation of quantum noise (accelerated radioactive decay of 115mIn metastable nuclei). Thus, this modality of QE transmission is fundamentally different from optical QE information transfer via quantum entangled space "q-bits" as developed by information theorists for quantum channel information transfer. Additionally, there is no obvious potential for signal degradation with increasing distance nor the problems associated with misalignment of optical information transfer systems.

DOI
10.48550/arxiv.nucl-ex/0411050

Related papers

Induced Quantum Entanglement of Nuclear Metastable States of 115In

Daniel L. Van Gent

Experiments conducted in our laboratory conclusively demonstrated that at least 20% of 115In metastable states become quantum entangled (QE) during gamma photo-excitation processes where a significant fraction of the photo-excitation gamma (E > 1.02 MeV) are QE. In addition, it was found that the half-life of 115mIn populations in identical photo-excited indium foils varied as much as 70% depending on whether the 99.999% purity indium foils were photo-excited with a High Intensity 60Co Source (HICS) or a Varian CLINAC (Compact Linear Accelerator) with average energy 2 MeV and maximum energy 6 MeV Bremsstrahlung photo-excitation quanta. Decay kinetics of 115mIn populations in indium foils demonstrate that these metastable states are primarily QE in pairs when photo-excited in the HICS apparatus and at higher orders of entanglement of triplets and possibly quadruplets when photo-excited with the CLINAC. It appears that QE gamma photons can transfer quantum entangled properties to radioactive metastable states.

arXiv:nucl-ex/0411047•Nov 23, 2004•3 citations

Remote Stimulated Triggering of Quantum Entangled Photoluminescent Molecules of Strontium Aluminate

D.L. Van Gent, Robert Desbrandes

We report experiments in which two photoluminescent samples of Strontium Aluminate pigments and Zinc Sulfide pebbles were quantum entangled via photoexcitation with entangled photons from a mercury lamp and a CRT screen. After photo-excitation, remote triggering of one of the sample with infrared (IR) photons yielded stimulated light variation from the quantum entangled other sample located 4 m away. The initial half-life of Strontium Aluminate is approximately one minute. However, molecules with a longer half-life may be found in the future. These experiments demonstrate that useful quantum information could be transferred through quantum channels via de-excitation of one sample of photoluminescent material quantum entangled with another.

arXiv:physics/0503052•Mar 7, 2005•2 citations

A Municipal Quantum Network Link with Entangled Infrared-Photons Emitted from Strontium Ions

Norbert M. Linke

In analogy to the development of classical computing, the true potential of quantum devices at scale lies in their interconnection within a network. The “quantum internet” [1] is still a distant aspiration with the main limitation being the remote entanglement generation rate dropping off sharply with distance due to the fiber losses of the visible and UV photons involved. Still, there have been a number of successful demonstrations of remote entanglement with different platforms [2]–[5]. Ongoing efforts have focused on converting entangled photons emitted from atomic systems into fiber-compatible wavelengths, but this conversion process incurs efficiency loss, noise, and system complexity. In this conference paper, we present initial results from direct transmission of infrared ion-photons emitted from Strontium ions at 1,092 nm through a municipal dark fiber link. This wavelength falls into a low-loss window in fiber transmission that will allow for local area quantum networks without the frequency-conversion overhead. This comes at the cost of a smaller branching ratio, limiting the transmission rate. However, there is a distance range of a few kilometers where this is an advantageous choice, making this scheme highly promising for city-scale quantum networks. We stimulate trapped Strontium ions to emit single photons at 1,092 nm. After emission, the ion is left in one of two states, which form a metastable qubit (see diagram in figure 1).

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)•Jun 23, 2025•0 citations

Possible Stimulated Emission of Entangled Rhodium Mossbauer Gammas

Cheng Yao, Wang, Zhongming

Observation of possible stimulated emission of Mossbauer gamma is reported by liquid-nitrogen quenching of rhodium sample from room temperature to 77K in the time-resolved Mossbauer spectroscopy. Recently, we have demonstrated the anomalous emission of three entangled gammas of the E3 Mossbauer transition generated by bremsstrahlung irradiation. In this work, we further report the high-speed decay of excited state. We conjecture that cooling shrinkage, gravitational redshift and crystal lattice collimate entangled gammas in a linear cavity. This opens up a new approach towards gamma lasing, if the stimulated emission occurs at this obtained low excitation density.

arXiv:quant-ph/0611031•Nov 2, 2006•1 citation

Quantum teleportation between remote atomic-ensemble quantum memories

Xiao‐Hui Bao, Xiao-Fan Xu, Che‐Ming Li +3 more

Quantum teleportation and quantum memory are two crucial elements for large-scale quantum networks. With the help of prior distributed entanglement as a "quantum channel," quantum teleportation provides an intriguing means to faithfully transfer quantum states among distant locations without actual transmission of the physical carriers [Bennett CH, et al. (1993) Phys Rev Lett 70(13):1895-1899]. Quantum memory enables controlled storage and retrieval of fast-flying photonic quantum bits with stationary matter systems, which is essential to achieve the scalability required for large-scale quantum networks. Combining these two capabilities, here we realize quantum teleportation between two remote atomic-ensemble quantum memory nodes, each composed of ∼10(8) rubidium atoms and connected by a 150-m optical fiber. The spin wave state of one atomic ensemble is mapped to a propagating photon and subjected to Bell state measurements with another single photon that is entangled with the spin wave state of the other ensemble. Two-photon detection events herald the success of teleportation with an average fidelity of 88(7)%. Besides its fundamental interest as a teleportation between two remote macroscopic objects, our technique may be useful for quantum information transfer between different nodes in quantum networks and distributed quantum computing.

arXiv:1211.2892•Proceedings of the National Academy of Sciences•Nov 9, 2012•114 citations

Coherent gamma photon generation in a Bose–Einstein condensate of 135m Cs

Luca Marmugi, P. M. Walker, Ferruccio Renzoni

We have identified a mechanism of collective nuclear de-excitation in a Bose–Einstein condensate of 135Cs atoms in their isomeric state, 135mCs, suitable for the generation of coherent gamma photons. The process described here relies on coherence transfer from the Bose–Einstein condensate to the photon field, leading to collective decay triggered by spontaneous emission of a gamma photon. The mechanism differs from single-pass amplification, which cannot occur in atomic systems due to the nuclear recoil and the associated large shift between absorption and emission lines, nor does it require the large densities necessary for standard Dicke super-radiance. This overcomes the limitations that have been hindering the production of coherent gamma photons in many systems. Therefore, we propose an approach for generation of coherent gamma rays, which relies on a combination of well established techniques of nuclear and atomic physics, and can be realized with currently available technology.

arXiv:1608.03468•Physics Letters B•Dec 18, 2017•16 citations
We report experiments in which two indium foils were quantum entangled via photoexcitation of stable 115In to radioactive 115mIn by utilizing Bremsstrahlung gamma photons produced by a Varian Compact Linear Accelerator (CLINAC). After photo-excitation, remote triggering of the "master" foil with low energy gamma photons, yielded stimulated emissions of 336 keV gamma photons from quantum entangled 115mIn in the "slave" foil located up to 1600 m away from the "master" foil. These experiments strongly demonstrate that useful quantum information can be transferred through quantum channels via modulation of quantum noise (accelerated radioactive decay of 115mIn metastable nuclei). Thus, this modality of QE transmission is fundamentally different from optical QE information transfer via quantum entangled space "q-bits" as developed by information theorists for quantum channel information transfer. Additionally, there is no obvious potential for signal degradation with increasing distance nor the problems associated with misalignment of optical information transfer systems.
Experiments conducted in our laboratory conclusively demonstrated that at least 20% of 115In metastable states become quantum entangled (QE) during gamma photo-excitation processes where a significant fraction of the photo-excitation gamma (E > 1.02 MeV) are QE. In addition, it was found that the half-life of 115mIn populations in identical photo-excited indium foils varied as much as 70% depending on whether the 99.999% purity indium foils were photo-excited with a High Intensity 60Co Source (HICS) or a Varian CLINAC (Compact Linear Accelerator) with average energy 2 MeV and maximum energy 6 MeV Bremsstrahlung photo-excitation quanta. Decay kinetics of 115mIn populations in indium foils demonstrate that these metastable states are primarily QE in pairs when photo-excited in the HICS apparatus and at higher orders of entanglement of triplets and possibly quadruplets when photo-excited with the CLINAC. It appears that QE gamma photons can transfer quantum entangled properties to radioactive metastable states.
We report experiments in which two photoluminescent samples of Strontium Aluminate pigments and Zinc Sulfide pebbles were quantum entangled via photoexcitation with entangled photons from a mercury lamp and a CRT screen. After photo-excitation, remote triggering of one of the sample with infrared (IR) photons yielded stimulated light variation from the quantum entangled other sample located 4 m away. The initial half-life of Strontium Aluminate is approximately one minute. However, molecules with a longer half-life may be found in the future. These experiments demonstrate that useful quantum information could be transferred through quantum channels via de-excitation of one sample of photoluminescent material quantum entangled with another.
In analogy to the development of classical computing, the true potential of quantum devices at scale lies in their interconnection within a network. The “quantum internet” [1] is still a distant aspiration with the main limitation being the remote entanglement generation rate dropping off sharply with distance due to the fiber losses of the visible and UV photons involved. Still, there have been a number of successful demonstrations of remote entanglement with different platforms [2]–[5]. Ongoing efforts have focused on converting entangled photons emitted from atomic systems into fiber-compatible wavelengths, but this conversion process incurs efficiency loss, noise, and system complexity. In this conference paper, we present initial results from direct transmission of infrared ion-photons emitted from Strontium ions at 1,092 nm through a municipal dark fiber link. This wavelength falls into a low-loss window in fiber transmission that will allow for local area quantum networks without the frequency-conversion overhead. This comes at the cost of a smaller branching ratio, limiting the transmission rate. However, there is a distance range of a few kilometers where this is an advantageous choice, making this scheme highly promising for city-scale quantum networks. We stimulate trapped Strontium ions to emit single photons at 1,092 nm. After emission, the ion is left in one of two states, which form a metastable qubit (see diagram in figure 1).
Observation of possible stimulated emission of Mossbauer gamma is reported by liquid-nitrogen quenching of rhodium sample from room temperature to 77K in the time-resolved Mossbauer spectroscopy. Recently, we have demonstrated the anomalous emission of three entangled gammas of the E3 Mossbauer transition generated by bremsstrahlung irradiation. In this work, we further report the high-speed decay of excited state. We conjecture that cooling shrinkage, gravitational redshift and crystal lattice collimate entangled gammas in a linear cavity. This opens up a new approach towards gamma lasing, if the stimulated emission occurs at this obtained low excitation density.
Quantum teleportation and quantum memory are two crucial elements for large-scale quantum networks. With the help of prior distributed entanglement as a "quantum channel," quantum teleportation provides an intriguing means to faithfully transfer quantum states among distant locations without actual transmission of the physical carriers [Bennett CH, et al. (1993) Phys Rev Lett 70(13):1895-1899]. Quantum memory enables controlled storage and retrieval of fast-flying photonic quantum bits with stationary matter systems, which is essential to achieve the scalability required for large-scale quantum networks. Combining these two capabilities, here we realize quantum teleportation between two remote atomic-ensemble quantum memory nodes, each composed of ∼10(8) rubidium atoms and connected by a 150-m optical fiber. The spin wave state of one atomic ensemble is mapped to a propagating photon and subjected to Bell state measurements with another single photon that is entangled with the spin wave state of the other ensemble. Two-photon detection events herald the success of teleportation with an average fidelity of 88(7)%. Besides its fundamental interest as a teleportation between two remote macroscopic objects, our technique may be useful for quantum information transfer between different nodes in quantum networks and distributed quantum computing.
We have identified a mechanism of collective nuclear de-excitation in a Bose–Einstein condensate of 135Cs atoms in their isomeric state, 135mCs, suitable for the generation of coherent gamma photons. The process described here relies on coherence transfer from the Bose–Einstein condensate to the photon field, leading to collective decay triggered by spontaneous emission of a gamma photon. The mechanism differs from single-pass amplification, which cannot occur in atomic systems due to the nuclear recoil and the associated large shift between absorption and emission lines, nor does it require the large densities necessary for standard Dicke super-radiance. This overcomes the limitations that have been hindering the production of coherent gamma photons in many systems. Therefore, we propose an approach for generation of coherent gamma rays, which relies on a combination of well established techniques of nuclear and atomic physics, and can be realized with currently available technology.