scholarly journals Molecular spin qubits based on lanthanide ions encapsulated in cubic polyoxopalladates: design criteria to enhance quantum coherence

2015 ◽  
Vol 2 (10) ◽  
pp. 893-897 ◽  
Author(s):  
José J. Baldoví ◽  
Lorena E. Rosaleny ◽  
Vasanth Ramachandran ◽  
Jonathan Christian ◽  
Naresh S. Dalal ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Axial Compression ◽  
Quantum Coherence ◽  
Lanthanide Ions ◽  
Design Criteria ◽  
Spin Qubits ◽  
Molecular Spin ◽  
Coherent Spin

Axial compression and a magnetic field can help to get coherent spin qubits.

scholarly journals Quantum coherence in a processable vanadyl complex: new tools for the search of molecular spin qubits

2016 ◽  
Vol 7 (3) ◽  
pp. 2074-2083 ◽  
Author(s):  
Lorenzo Tesi ◽  
Eva Lucaccini ◽  
Irene Cimatti ◽  
Mauro Perfetti ◽  
Matteo Mannini ◽  
...  
Keyword(s):  
Spin System ◽  
Quantum Coherence ◽  
Spin Qubits ◽  
Vanadyl Complex ◽  
Molecular Spin

A multitechnique investigation of an evaporable vanadyl spin system with long-lived quantum coherence that self-assembles on gold.

Room-Temperature Quantum Coherence and Rabi Oscillations in Vanadyl Phthalocyanine: Toward Multifunctional Molecular Spin Qubits

2016 ◽  
Vol 138 (7) ◽  
pp. 2154-2157 ◽  
Author(s):  
Matteo Atzori ◽  
Lorenzo Tesi ◽  
Elena Morra ◽  
Mario Chiesa ◽  
Lorenzo Sorace ◽  
...  
Keyword(s):  
Quantum Coherence ◽  
Room Temperature ◽  
Rabi Oscillations ◽  
Spin Qubits ◽  
Molecular Spin

Engineering Electronic Structure to Protect Phase Memory in Molecular Qubits by Minimising Orbital Angular Momentum

2018 ◽  
Author(s):  
Ana Maria Ariciu ◽  
David H. Woen ◽  
Daniel N. Huh ◽  
Lydia Nodaraki ◽  
Andreas Kostopoulos ◽  
...  
Keyword(s):  
Electron Spin ◽  
Quantum Coherence ◽  
Quantum Information Processing ◽  
Pulse Sequences ◽  
Grover Algorithm ◽  
Ligand Shell ◽  
Information Strategies ◽  
Spin Qubit ◽  
Molecular Spin ◽  
The Impact

Using electron spins within molecules for quantum information processing (QIP) was first proposed by Leuenberger and Loss (1), who showed how the Grover algorithm could be mapped onto a Mn12 cage (2). Since then several groups have examined two-level (S = ½) molecular spin systems as possible qubits (3-12). There has also been a report of the implementation of the Grover algorithm in a four-level molecular qudit (13). A major challenge is to protect the spin qubit from noise that causes loss of phase information; strategies to minimize the impact of noise on qubits can be categorized as corrective, reductive, or protective. Corrective approaches allow noise and correct for its impact on the qubit using advanced microwave pulse sequences (3). Reductive approaches reduce the noise by minimising the number of nearby nuclear spins (7-11), and increasing the rigidity of molecules to minimise the effect of vibrations (which can cause a fluctuating magnetic field via spin-orbit coupling) (9,11); this is essentially engineering the ligand shell surrounding the electron spin. A protective approach would seek to make the qubit less sensitive to noise: an example of the protective approach is the use of clock transitions to render spin states immune to magnetic fields at first order (12). Here we present a further protective method that would complement reductive and corrective approaches to enhancing quantum coherence in molecular qubits. The target is a molecular spin qubit with an effective 2S ground state: we achieve this with a family of divalent rare-earth molecules that have negligible magnetic anisotropy such that the isotropic nature of the electron spin renders the qubit markedly less sensitive to magnetic noise, allowing coherent spin manipulations even at room temperature. If combined with the other strategies, we believe this could lead to molecular qubits with substantial advantages over competing qubit proposals.<br>

Magnetic field effects in rigidly linked D-A dyads: Extreme on-resonance quantum coherence effect on charge recombination

2019 ◽  
Vol 151 (24) ◽  
pp. 244308 ◽  
Author(s):  
David Mims ◽  
Alexander Schmiedel ◽  
Marco Holzapfel ◽  
Nikita N. Lukzen ◽  
Christoph Lambert ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Coherence ◽  
Charge Recombination ◽  
Magnetic Field Effects ◽  
Field Effects ◽  
Coherence Effect

External magnetic field dependent influence of lanthanide ions on the chemistry of radical pairs in micelles

1985 ◽  
Vol 120 (4-5) ◽  
pp. 397-400 ◽  
Author(s):  
Nicholas J. Turro ◽  
Xuegong Lei ◽  
Ian R. Gould ◽  
Matthew B. Zimmt
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Lanthanide Ions ◽  
Radical Pairs ◽  
Field Dependent

Adiabatic quantum computing with spin qubits hosted by molecules

2015 ◽  
Vol 17 (4) ◽  
pp. 2742-2749 ◽  
Author(s):  
Satoru Yamamoto ◽  
Shigeaki Nakazawa ◽  
Kenji Sugisaki ◽  
Kazunobu Sato ◽  
Kazuo Toyota ◽  
...  
Keyword(s):  
Quantum Computing ◽  
Spin Qubits ◽  
Adiabatic Quantum Computing ◽  
Acid Radical ◽  
Glutaconic Acid ◽  
Molecular Spin ◽  
Phthalocyanine Derivative

Molecular spin QCs for adiabatic quantum computing: a phthalocyanine derivative with three electron qubits and a glutaconic acid radical with one electron bus qubit and two nuclear client qubits.

scholarly journals Enhancing coherence in molecular spin qubits via atomic clock transitions

Nature ◽  
2016 ◽  
Vol 531 (7594) ◽  
pp. 348-351 ◽  
Author(s):  
Muhandis Shiddiq ◽  
Dorsa Komijani ◽  
Yan Duan ◽  
Alejandro Gaita-Ariño ◽  
Eugenio Coronado ◽  
...  
Keyword(s):  
Atomic Clock ◽  
Spin Qubits ◽  
Molecular Spin

Magnetoresistance in Granular Metals

1990 ◽  
Vol 195 ◽  
Author(s):  
W.L. Mclean
Keyword(s):  
Magnetic Field ◽  
Quantum Coherence ◽  
The Other ◽  
Variable Range Hopping ◽  
Mobility Edge ◽  
Variable Range ◽  
Quantum Coherence Effects ◽  
The Magnetic Field ◽  
Scaling Arguments ◽  
Granular Aluminum

ABSTRACTWe review the origins of the magnetoresistance in granular metals with emphasis on the quantum coherence effects arising from the interference of electrons traveling by different paths. We discuss the maximum in the magnetoresistance expected from scaling arguments and observed in granular aluminum. Two theories of the magnetoresistance in the variable range hopping regime, one based on the magnetic-field induced shift of the mobility edge and the other dealing with ‘directed’ hopping, are compared with experiments.

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