scholarly journals Decoherence of nuclear spins due to dipole-dipole interactions probed by resistively detected nuclear magnetic resonance

2007 ◽  
Vol 91 (19) ◽  
pp. 193101 ◽  
Author(s):  
T. Ota ◽  
G. Yusa ◽  
N. Kumada ◽  
S. Miyashita ◽  
T. Fujisawa ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nuclear Spins ◽  
Dipole Interactions ◽  
Nuclear Magnetic

scholarly journals Analysis of the transient response of nuclear spins in GaAs with/without nuclear magnetic resonance

AIP Advances ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 056305 ◽  
Author(s):  
Mahmoud Rasly ◽  
Zhichao Lin ◽  
Masafumi Yamamoto ◽  
Tetsuya Uemura
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transient Response ◽  
Nuclear Spins ◽  
Nuclear Magnetic

QUBIT DECOHERENCE IN A NUCLEAR MAGNETIC RESONANCE-LIKE QUANTUM PROCESSOR WITH TRAPPED PARTICLES

2006 ◽  
Vol 20 (11n13) ◽  
pp. 1699-1710 ◽  
Author(s):  
G. CIARAMICOLI ◽  
I. MARZOLI ◽  
P. TOMBESI
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Charged Particles ◽  
Penning Traps ◽  
Nuclear Spins ◽  
Cyclotron Motion ◽  
Trapped Particles ◽  
Depth Analysis ◽  
Quantum Processor ◽  
Nuclear Magnetic

We present an in-depth analysis of a potentially significant source of decoherence for a quantum processor, we proposed in our previous paper.1 The processor consists of an array of charged particles confined in planar micro-Penning traps. Qubits are encoded in the particle spins, that are mutually coupled as nuclear spins in a nuclear magnetic resonance-molecule. In this paper, we study in detail the de-phasing effect on the qubit dynamics produced by thermal excitations in the cyclotron motion of the particles.

Coherence Time of Nuclear Spins in GaAs Quantum Well Probed by Submicron-Scale All-Electrical Nuclear Magnetic Resonance Device

2008 ◽  
Vol 47 (4) ◽  
pp. 3115-3117 ◽  
Author(s):  
Takeshi Ota ◽  
Norio Kumada ◽  
Go Yusa ◽  
Sen Miyashita ◽  
Toshimasa Fujisawa ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Quantum Well ◽  
Coherence Time ◽  
Nuclear Spins ◽  
Submicron Scale ◽  
Nuclear Magnetic

scholarly journals Constraints on bosonic dark matter from ultralow-field nuclear magnetic resonance

2019 ◽  
Vol 5 (10) ◽  
pp. eaax4539 ◽  
Author(s):  
Antoine Garcon ◽  
John W. Blanchard ◽  
Gary P. Centers ◽  
Nataniel L. Figueroa ◽  
Peter W. Graham ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Dark Matter ◽  
Magnetic Resonance ◽  
Direct Detection ◽  
Dark Matter Halo ◽  
Nuclear Spins ◽  
Dark Matter Search ◽  
Modern Physics ◽  
The Universe ◽  
Nuclear Magnetic

The nature of dark matter, the invisible substance making up over 80% of the matter in the universe, is one of the most fundamental mysteries of modern physics. Ultralight bosons such as axions, axion-like particles, or dark photons could make up most of the dark matter. Couplings between such bosons and nuclear spins may enable their direct detection via nuclear magnetic resonance (NMR) spectroscopy: As nuclear spins move through the galactic dark-matter halo, they couple to dark matter and behave as if they were in an oscillating magnetic field, generating a dark-matter–driven NMR signal. As part of the cosmic axion spin precession experiment (CASPEr), an NMR-based dark-matter search, we use ultralow-field NMR to probe the axion-fermion “wind” coupling and dark-photon couplings to nuclear spins. No dark matter signal was detected above background, establishing new experimental bounds for dark matter bosons with masses ranging from 1.8 × 10−16 to 7.8 × 10−14 eV.

scholarly journals On the quantumness of correlations in nuclear magnetic resonance

2012 ◽  
Vol 370 (1976) ◽  
pp. 4821-4836 ◽  
Author(s):  
D. O. Soares-Pinto ◽  
R. Auccaise ◽  
J. Maziero ◽  
A. Gavini-Viana ◽  
R. M. Serra ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Quantum Dynamics ◽  
Information Science ◽  
Single Photon ◽  
Quantum Correlations ◽  
Nuclear Spins ◽  
Separable States ◽  
Experimental Implementation ◽  
Nuclear Magnetic

Nuclear magnetic resonance (NMR) was successfully employed to test several protocols and ideas in quantum information science. In most of these implementations, the existence of entanglement was ruled out. This fact introduced concerns and questions about the quantum nature of such bench tests. In this paper, we address some issues related to the non-classical aspects of NMR systems. We discuss some experiments where the quantum aspects of this system are supported by quantum correlations of separable states. Such quantumness, beyond the entanglement–separability paradigm, is revealed via a departure between the quantum and the classical versions of information theory. In this scenario, the concept of quantum discord seems to play an important role. We also present an experimental implementation of an analogue of the single-photon Mach–Zehnder interferometer employing two nuclear spins to encode the interferometric paths. This experiment illustrates how non-classical correlations of separable states may be used to simulate quantum dynamics. The results obtained are completely equivalent to the optical scenario, where entanglement (between two field modes) may be present.

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