scholarly journals Group of Quantum Bits Acting as a Bit Using a Single-Domain Ferromagnet of Uniaxial Magnetic Ions

ChemPhysChem ◽  
2017 ◽  
Vol 18 (16) ◽  
pp. 2147-2150 ◽  
Author(s):  
Elijah E. Gordon ◽  
Hyun-Joo Koo ◽  
Shuiquan Deng ◽  
Jürgen Köhler ◽  
Myung-Hwan Whangbo
Keyword(s):  
Single Domain ◽  
Quantum Bits ◽  
Magnetic Ions

scholarly journals Single-Domain Ferromagnet of Noncentrosymmetric Uniaxial Magnetic Ions and Magnetoelectric Interaction

2017 ◽  
Vol 129 (34) ◽  
pp. 10330-10333 ◽  
Author(s):  
Hyun-Joo Koo ◽  
Elijah E. Gordon ◽  
Myung-Hwan Whangbo
Keyword(s):  
Single Domain ◽  
Magnetoelectric Interaction ◽  
Magnetic Ions

scholarly journals PARAMAGNETIC MATERIALS AND PRACTICAL ALGORITHMIC COOLING FOR NMR QUANTUM COMPUTING

2005 ◽  
Vol 03 (01) ◽  
pp. 281-285 ◽  
Author(s):  
JOSÉ M. FERNANDEZ ◽  
TAL MOR ◽  
YOSSI WEINSTEIN
Keyword(s):  
Quantum Computing ◽  
Thermal Relaxation ◽  
Quantum Computers ◽  
Thermalization Time ◽  
Quantum Bits ◽  
Simple Quantum ◽  
Paramagnetic Materials ◽  
Paramagnetic Salt ◽  
Magnetic Ions ◽  
Entropy Compression

Algorithmic cooling is a method that uses novel data compression techniques and simple quantum computing devices to improve NMR spectroscopy, and to offer scalable NMR quantum computers. The algorithm recursively employs two steps. A reversible entropy compression of computation quantum-bits (qubits) of the system and an irreversible heat transfer from the system to the environment through a set of reset qubits that reach thermal relaxation rapidly. Is it possible to experimentally demonstrate algorithmic cooling using existing technology? To allow experimental algorithmic cooling, the thermalization time of the reset qubits must be much shorter than the thermalization time of the computation qubits. However, such high thermalization-times ratios have yet to be reported. We investigate here the effect of a paramagnetic salt on the thermalization-times ratio of computation qubits (carbons) and a reset qubit (hydrogen). We show that the thermalization-times ratio is improved by approximately three-fold. Based on this result, an experimental demonstration of algorithmic cooling by thermalization and magnetic ions has been performed by the authors and collaborators.

Polarity Determination in Sphalerite and Wurtzite Structures

1990 ◽  
Vol 48 (2) ◽  
pp. 500-501
Author(s):  
Stuart McKernan ◽  
C. Barry Carter
Keyword(s):  
Opposite Polarity ◽  
Single Domain ◽  
Polar Material ◽  
Electron Microscopic ◽  
Dynamical Interaction ◽  
X Ray ◽  
Polarity Determination ◽  
The Absolute ◽  
Microscopic Techniques

The determination of the absolute polarity of a polar material is often crucial to the understanding of the defects which occur in such materials. Several methods exist by which this determination may be performed. In bulk, single-domain specimens, macroscopic techniques may be used, such as the different etching behavior, using the appropriate etchant, of surfaces with opposite polarity. X-ray measurements under conditions where Friedel’s law (which means that the intensity of reflections from planes of opposite polarity are indistinguishable) breaks down can also be used to determine the absolute polarity of bulk, single-domain specimens. On the microscopic scale, and particularly where antiphase boundaries (APBs), which separate regions of opposite polarity exist, electron microscopic techniques must be employed. Two techniques are commonly practised; the first [1], involves the dynamical interaction of hoLz lines which interfere constructively or destructively with the zero order reflection, depending on the crystal polarity. The crystal polarity can therefore be directly deduced from the relative intensity of these interactions.

Theoretical single-domain size of NiZn ferrite

1998 ◽  
Vol 08 (PR2) ◽  
pp. Pr2-389-Pr2-392 ◽  
Author(s):  
A. Aharoni ◽  
J. P. Jakubovics
Keyword(s):  
Domain Size ◽  
Single Domain
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