scholarly journals Coupling light to a nuclear spin gas with a two-photon linewidth of five millihertz

2021 ◽  
Vol 7 (14) ◽  
pp. eabe9164
Author(s):  
Or Katz ◽  
Roy Shaham ◽  
Ofer Firstenberg
Keyword(s):  
Noble Gas ◽  
Optical Excitation ◽  
Coherence Time ◽  
Nuclear Spins ◽  
Spin Coherence ◽  
Coherent Interface ◽  
Two Photon ◽  
Alkali Atoms ◽  
Optical Domain ◽  
Photon Spectra

Nuclear spins of noble gases feature extremely long coherence times but are inaccessible to optical photons. Here, we realize a coherent interface between light and noble-gas spins that is mediated by alkali atoms. We demonstrate the optical excitation of the noble-gas spins and observe the coherent back action on the light in the form of high-contrast two-photon spectra. We report on a record two-photon linewidth of 5 ± 0.7 mHz above room temperature, corresponding to a 1-min coherence time. This experiment provides a demonstration of coherent bidirectional coupling between light and noble-gas spins, rendering their long-lived spin coherence accessible for manipulations in the optical domain.

scholarly journals Limit on Lorentz-Invariance- and CPT-Violating Neutron Spin Interactions Using a 3He-129Xe Comagnetometer

2016 ◽  
Vol 40 ◽  
pp. 1660082 ◽  
Author(s):  
F. Allmendinger ◽  
U. Schmidt ◽  
W. Heil ◽  
S. Karpuk ◽  
Yu. Sobolev ◽  
...  
Keyword(s):  
Lorentz Invariance ◽  
Background Field ◽  
Coherence Time ◽  
Neutron Spin ◽  
Nuclear Spins ◽  
Spin Coherence ◽  
Spin Interactions ◽  
Laboratory Reference Frame ◽  
Background Fields ◽  
Spin Coherence Time

We performed a search for a Lorentz-invariance- and CPT-violating coupling of the 3He and [Formula: see text]Xe nuclear spins to posited background fields. Our experimental approach is to measure the free precession of nuclear spin polarized 3He and [Formula: see text]Xe atoms using SQUIDs as detectors. As the laboratory reference frame rotates with respect to distant stars, we look for a sidereal modulation of the Larmor frequencies of the co-located spin samples. As a result we obtain an upper limit on the equatorial component of the background field [Formula: see text] GeV (68% C.L.). This experiment is currently the most precise test of spin anisotropy due to the excellent long spin-coherence time.

scholarly journals Fine structures of valley-polarized excitonic states in monolayer transitional metal dichalcogenides

Nanophotonics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 1811-1829 ◽  
Author(s):  
Zhipeng Li ◽  
Tianmeng Wang ◽  
Shengnan Miao ◽  
Zhen Lian ◽  
Su-Fei Shi
Keyword(s):  
Optical Excitation ◽  
Coherence Time ◽  
Two Dimensions ◽  
Degree Of Freedom ◽  
Research Progress ◽  
Many Body ◽  
Transitional Metal ◽  
Metal Dichalcogenides ◽  
Fine Structures ◽  
Excitonic States

AbstractMonolayer transitional metal dichalcogenides (TMDCs), a new class of atomically thin semiconductor, respond to optical excitation strongly with robust excitons, which stem from the reduced screening in two dimensions. These excitons also possess a new quantum degree of freedom known as valley spin, which has inspired the field of valleytronics. The strongly enhanced Coulomb interaction allows the exciton to bind with other particles to form new excitonic states. However, despite the discovery of trions, most of the excitonic states in monolayer TMDCs remain elusive until recently, when new light was shed into the fascinating excitonic fine structures with drastically improved sample quality through boron nitride encapsulation. Here, we review the latest research progress on fine structures of excitonic states in monolayer TMDCs, with a focus on tungsten-based TMDCs and related alloy. Many of the new excitonic complexes inherit the valley degree of freedom, and the valley-polarized dark excitonic states are of particular interest because of their long lifetime and possible long valley coherence time. The capability of resolving the excitonic fine structures also enables the investigation of exciton–phonon interactions. The knowledge of the interlayer between excitons and other particles not only advances our understanding of many-body effects in the monolayer TMDCs but also provides guidance on future applications based on TMDCs.

scholarly journals Controlling Quantum Interference between Virtual and Dipole Two-Photon Optical Excitation Pathways Using Phase-Shaped Laser Pulses

2021 ◽  
Author(s):  
J. Lahiri ◽  
S. H. Yuwono ◽  
I. Magoulas ◽  
M. Moemeni ◽  
B. Borhan ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Optical Excitation ◽  
Laser Pulses ◽  
Two Photon

scholarly journals Room-temperature control and electrical readout of individual nitrogen-vacancy nuclear spins

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Michal Gulka ◽  
Daniel Wirtitsch ◽  
Viktor Ivády ◽  
Jelle Vodnik ◽  
Jaroslav Hruby ◽  
...  
Keyword(s):  
Dipolar Interaction ◽  
Coherence Time ◽  
Wide Bandgap ◽  
Nitrogen Vacancy ◽  
Ambient Conditions ◽  
Nuclear Spins ◽  
Quantum Device ◽  
Nanoscale Electronics ◽  
Quantum Processor ◽  
Processor Unit

AbstractNuclear spins in semiconductors are leading candidates for future quantum technologies, including quantum computation, communication, and sensing. Nuclear spins in diamond are particularly attractive due to their long coherence time. With the nitrogen-vacancy (NV) centre, such nuclear qubits benefit from an auxiliary electronic qubit, which, at cryogenic temperatures, enables probabilistic entanglement mediated optically by photonic links. Here, we demonstrate a concept of a microelectronic quantum device at ambient conditions using diamond as wide bandgap semiconductor. The basic quantum processor unit – a single 14N nuclear spin coupled to the NV electron – is read photoelectrically and thus operates in a manner compatible with nanoscale electronics. The underlying theory provides the key ingredients for photoelectric quantum gate operations and readout of nuclear qubit registers. This demonstration is, therefore, a step towards diamond quantum devices with a readout area limited by inter-electrode distance rather than by the diffraction limit. Such scalability could enable the development of electronic quantum processors based on the dipolar interaction of spin-qubits placed at nanoscopic proximity.

scholarly journals Second-scale nuclear spin coherence time of ultracold23Na40K molecules

Science ◽  
2017 ◽  
Vol 357 (6349) ◽  
pp. 372-375 ◽  
Author(s):  
Jee Woo Park ◽  
Zoe Z. Yan ◽  
Huanqian Loh ◽  
Sebastian A. Will ◽  
Martin W. Zwierlein
Keyword(s):  
Nuclear Spin ◽  
Coherence Time ◽  
Spin Coherence ◽  
Spin Coherence Time

Dynamics of spin–orbit recoupling in collisions of alkali atoms with noble-gas atoms using atomic core potentials

2003 ◽  
Vol 119 (23) ◽  
pp. 12316-12322 ◽  
Author(s):  
A. Reyes ◽  
D. A. Micha
Keyword(s):  
Noble Gas ◽  
Spin Orbit ◽  
Atomic Core ◽  
Alkali Atoms

Erratum: Two-photon spectra of single-crystal gadolinium diglycolate

1991 ◽  
Vol 44 (14) ◽  
pp. 7769-7769
Author(s):  
Tapanendu Kundu ◽  
Asok K. Banerjee ◽  
Mihir Chowdhury
Keyword(s):  
Single Crystal ◽  
Two Photon ◽  
Photon Spectra

Optically addressable nuclear spins in a solid with a six-hour coherence time

Nature ◽  
2015 ◽  
Vol 517 (7533) ◽  
pp. 177-180 ◽  
Author(s):  
Manjin Zhong ◽  
Morgan P. Hedges ◽  
Rose L. Ahlefeldt ◽  
John G. Bartholomew ◽  
Sarah E. Beavan ◽  
...  
Keyword(s):  
Coherence Time ◽  
Nuclear Spins

Two-photon spectra of C 60 and C 70 films between 0.74 and 1.7 μm

1997 ◽  
Author(s):  
Friedrich P. Strohkendl ◽  
Theresa J. Axenson ◽  
R. J. Larsen ◽  
Larry R. Dalton ◽  
Robert W. Hellwarth ◽  
...  
Keyword(s):  
Two Photon ◽  
Photon Spectra
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