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Journal articles on the topic 'Molecular Spin Qubits'

Author: Grafiati
Published: 10 March 2023

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1

Yamamoto, Satoru, Shigeaki Nakazawa, Kenji Sugisaki, Kazunobu Sato, Kazuo Toyota, Daisuke Shiomi, and Takeji Takui. "Adiabatic quantum computing with spin qubits hosted by molecules." Physical Chemistry Chemical Physics 17, no. 4 (2015): 2742–49. http://dx.doi.org/10.1039/c4cp04744c.

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2

Tahan, Charles. "Opinion: Democratizing Spin Qubits." Quantum 5 (November 18, 2021): 584. http://dx.doi.org/10.22331/q-2021-11-18-584.

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I've been building Powerpoint-based quantum computers with electron spins in silicon for 20 years. Unfortunately, real-life-based quantum dot quantum computers are harder to implement. Materials, fabrication, and control challenges still impede progress. The way to accelerate discovery is to make and measure more qubits. Here I discuss separating the qubit realization and testing circuitry from the materials science and on-chip fabrication that will ultimately be necessary. This approach should allow us, in the shorter term, to characterize wafers non-invasively for their qubit-relevant properties, to make small qubit systems on various different materials with little extra cost, and even to test spin-qubit to superconducting cavity entanglement protocols where the best possible cavity quality is preserved. Such a testbed can advance the materials science of semiconductor quantum information devices and enable small quantum computers. This article may also be useful as a light and light-hearted introduction to quantum dot spin qubits.
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3

Mani, Tomoyasu. "Molecular qubits based on photogenerated spin-correlated radical pairs for quantum sensing." Chemical Physics Reviews 3, no. 2 (June 2022): 021301. http://dx.doi.org/10.1063/5.0084072.

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Photogenerated spin-correlated radical pairs (SCRPs) in electron donor–bridge–acceptor (D–B–A) molecules can act as molecular qubits and inherently spin qubit pairs. SCRPs can take singlet and triplet spin states, comprising the quantum superposition state. Their synthetic accessibility and well-defined structures, together with their ability to be prepared in an initially pure, entangled spin state and optical addressability, make them one of the promising avenues for advancing quantum information science. Coherence between two spin states and spin selective electron transfer reactions form the foundation of using SCRPs as qubits for sensing. We can exploit the unique sensitivity of the spin dynamics of SCRPs to external magnetic fields for sensing applications including resolution-enhanced imaging, magnetometers, and magnetic switch. Molecular quantum sensors, if realized, can provide new technological developments beyond what is possible with classical counterparts. While the community of spin chemistry has actively investigated magnetic field effects on chemical reactions via SCRPs for several decades, we have not yet fully exploited the synthetic tunability of molecular systems to our advantage. This review offers an introduction to the photogenerated SCRPs-based molecular qubits for quantum sensing, aiming to lay the foundation for researchers new to the field and provide a basic reference for researchers active in the field. We focus on the basic principles necessary to construct molecular qubits based on SCRPs and the examples in quantum sensing explored to date from the perspective of the experimentalist.
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4

Bahari, Iskandar, Timothy P. Spiller, Shane Dooley, Anthony Hayes, and Francis McCrossan. "Collapse and revival of entanglement between qubits coupled to a spin coherent state." International Journal of Quantum Information 16, no. 02 (March 2018): 1850017. http://dx.doi.org/10.1142/s021974991850017x.

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We extend the study of the Jayne–Cummings (JC) model involving a pair of identical two-level atoms (or qubits) interacting with a single mode quantized field. We investigate the effects of replacing the radiation field mode with a composite spin, comprising [Formula: see text] qubits, or spin-1/2 particles. This model is relevant for physical implementations in superconducting circuit QED, ion trap and molecular systems. For the case of the composite spin prepared in a spin coherent state, we demonstrate the similarities of this set-up to the qubits-field model in terms of the time evolution, attractor states and in particular the collapse and revival of the entanglement between the two qubits. We extend our analysis by taking into account an effect due to qubit imperfections. We consider a difference (or “mismatch”) in the dipole interaction strengths of the two qubits, for both the field mode and composite spin cases. To address decoherence due to this mismatch, we then average over this coupling strength difference with distributions of varying width. We demonstrate in both the field mode and the composite spin scenarios that increasing the width of the “error” distribution increases suppression of the coherent dynamics of the coupled system, including the collapse and revival of the entanglement between the qubits.
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5

Xue, Xiao, Maximilian Russ, Nodar Samkharadze, Brennan Undseth, Amir Sammak, Giordano Scappucci, and Lieven M. K. Vandersypen. "Quantum logic with spin qubits crossing the surface code threshold." Nature 601, no. 7893 (January 19, 2022): 343–47. http://dx.doi.org/10.1038/s41586-021-04273-w.

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AbstractHigh-fidelity control of quantum bits is paramount for the reliable execution of quantum algorithms and for achieving fault tolerance—the ability to correct errors faster than they occur1. The central requirement for fault tolerance is expressed in terms of an error threshold. Whereas the actual threshold depends on many details, a common target is the approximately 1% error threshold of the well-known surface code2,3. Reaching two-qubit gate fidelities above 99% has been a long-standing major goal for semiconductor spin qubits. These qubits are promising for scaling, as they can leverage advanced semiconductor technology4. Here we report a spin-based quantum processor in silicon with single-qubit and two-qubit gate fidelities, all of which are above 99.5%, extracted from gate-set tomography. The average single-qubit gate fidelities remain above 99% when including crosstalk and idling errors on the neighbouring qubit. Using this high-fidelity gate set, we execute the demanding task of calculating molecular ground-state energies using a variational quantum eigensolver algorithm5. Having surpassed the 99% barrier for the two-qubit gate fidelity, semiconductor qubits are well positioned on the path to fault tolerance and to possible applications in the era of noisy intermediate-scale quantum devices.
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6

Koiller, Belita, Xuedong Hu, Rodrigo B. Capaz, Adriano S. Martins, and Sankar Das Sarma. "Silicon-based spin and charge quantum computation." Anais da Academia Brasileira de Ciências 77, no. 2 (June 2005): 201–22. http://dx.doi.org/10.1590/s0001-37652005000200002.

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Silicon-based quantum-computer architectures have attracted attention because of their promise for scalability and their potential for synergetically utilizing the available resources associated with the existing Si technology infrastructure. Electronic and nuclear spins of shallow donors (e.g. phosphorus) in Si are ideal candidates for qubits in such proposals due to the relatively long spin coherence times. For these spin qubits, donor electron charge manipulation by external gates is a key ingredient for control and read-out of single-qubit operations, while shallow donor exchange gates are frequently invoked to perform two-qubit operations. More recently, charge qubits based on tunnel coupling in P+2 substitutional molecular ions in Si have also been proposed. We discuss the feasibility of the building blocks involved in shallow donor quantum computation in silicon, taking into account the peculiarities of silicon electronic structure, in particular the six degenerate states at the conduction band edge. We show that quantum interference among these states does not significantly affect operations involving a single donor, but leads to fast oscillations in electron exchange coupling and on tunnel-coupling strength when the donor pair relative position is changed on a lattice-parameter scale. These studies illustrate the considerable potential as well as the tremendous challenges posed by donor spin and charge as candidates for qubits in silicon.
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7

Levi, Barbara Goss. "Making molecular-spin qubits more robust." Physics Today 69, no. 5 (May 2016): 17–21. http://dx.doi.org/10.1063/pt.3.3157.

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8

Affronte, Marco, Filippo Troiani, Alberto Ghirri, Stefano Carretta, Paolo Santini, Valdis Corradini, Raffael Schuecker, Chris Muryn, Grigore Timco, and Richard E. Winpenny. "Molecular routes for spin cluster qubits." Dalton Transactions, no. 23 (2006): 2810. http://dx.doi.org/10.1039/b515731e.

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9

Altintas, Azmi Ali, Fatih Ozaydin, Cihan Bayindir, and Veysel Bayrakci. "Prisoners’ Dilemma in a Spatially Separated System Based on Spin–Photon Interactions." Photonics 9, no. 9 (August 30, 2022): 617. http://dx.doi.org/10.3390/photonics9090617.

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Having access to ideal quantum mechanical resources, the prisoners’ dilemma can be ceased Here, we propose a distributed quantum circuit to allow spatially separated prisoners to play the prisoners’ dilemma game. Decomposing the circuit into controlled-Z and single-qubit gates only, we design a corresponding spin–photon-interaction-based physical setup within the reach of current technology. In our setup, spins are considered to be the players’ logical qubits, which can be realized via nitrogen-vacancy centers in diamond or quantum dots coupled to optical cavities, and the game is played via a flying photon realizing logic operations by interacting with the spatially separated optical cavities to which the spin qubits are coupled. We also analyze the effect of the imperfect realization of two-qubit gates on the game, and discuss the revival of the dilemma and the emergence of new Nash equilibria.
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10

Kurganskii, Ivan V., Evgeniya S. Bazhina, Alexander A. Korlyukov, Konstantin A. Babeshkin, Nikolay N. Efimov, Mikhail A. Kiskin, Sergey L. Veber, Alexey A. Sidorov, Igor L. Eremenko, and Matvey V. Fedin. "Mapping Magnetic Properties and Relaxation in Vanadium(IV) Complexes with Lanthanides by Electron Paramagnetic Resonance." Molecules 24, no. 24 (December 14, 2019): 4582. http://dx.doi.org/10.3390/molecules24244582.

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Vanadium(IV) complexes are actively studied as potential candidates for molecular spin qubits operating at room temperatures. They have longer electron spin decoherence times than many other transition ions, being the key property for applications in quantum information processing. In most cases reported to date, the molecular complexes were optimized through the design for this purpose. In this work, we investigate the relaxation properties of vanadium(IV) ions incorporated in complexes with lanthanides using electron paramagnetic resonance (EPR). In all cases, the VO6 moieties with no nuclear spins in the first coordination sphere are addressed. We develop and implement the approaches for facile diagnostics of relaxation characteristics in individual VO6 moieties of such compounds. Remarkably, the estimated relaxation times are found to be close to those of other vanadium-based qubits obtained previously. In the future, a synergistic combination of qubit-friendly properties of vanadium ions with single-molecule magnetism and luminescence of lanthanides can be pursued to realize new functionalities of such materials.
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11

Aravena, Daniel, and Eliseo Ruiz. "Spin dynamics in single-molecule magnets and molecular qubits." Dalton Transactions 49, no. 29 (2020): 9916–28. http://dx.doi.org/10.1039/d0dt01414a.

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12

Wasielewski, Michael R. "Light-driven spin chemistry for quantum information science." Physics Today 76, no. 3 (March 1, 2023): 28–34. http://dx.doi.org/10.1063/pt.3.5196.

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13

Kintzel, Benjamin, Michael Böhme, Junjie Liu, Anja Burkhardt, Jakub Mrozek, Axel Buchholz, Arzhang Ardavan, and Winfried Plass. "Molecular electronic spin qubits from a spin-frustrated trinuclear copper complex." Chemical Communications 54, no. 92 (2018): 12934–37. http://dx.doi.org/10.1039/c8cc06741d.

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The trinuclear copper(ii) complex [Cu3(saltag)(py)6]ClO4 (H5saltag = tris(2-hydroxybenzylidene)triaminoguanidine) was synthesized and characterized by experimental as well as theoretical methods.
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14

Lunghi, Alessandro, and Stefano Sanvito. "Electronic spin-spin decoherence contribution in molecular qubits by quantum unitary spin dynamics." Journal of Magnetism and Magnetic Materials 487 (October 2019): 165325. http://dx.doi.org/10.1016/j.jmmm.2019.165325.

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15

Picó-Cortés, Jordi, and Gloria Platero. "Dynamical second-order noise sweetspots in resonantly driven spin qubits." Quantum 5 (December 23, 2021): 607. http://dx.doi.org/10.22331/q-2021-12-23-607.

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Quantum dot-based quantum computation employs extensively the exchange interaction between nearby electronic spins in order to manipulate and couple different qubits. The exchange interaction, however, couples the qubit states to charge noise, which reduces the fidelity of the quantum gates that employ it. The effect of charge noise can be mitigated by working at noise sweetspots in which the sensitivity to charge variations is reduced. In this work we study the response to charge noise of a double quantum dot based qubit in the presence of ac gates, with arbitrary driving amplitudes, applied either to the dot levels or to the tunneling barrier. Tuning with an ac driving allows to manipulate the sign and strength of the exchange interaction as well as its coupling to environmental electric noise. Moreover, we show the possibility of inducing a second-order sweetspot in the resonant spin-triplet qubit in which the dephasing time is significantly increased.
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16

Baldoví, José J., Lorena E. Rosaleny, Vasanth Ramachandran, Jonathan Christian, Naresh S. Dalal, Juan M. Clemente-Juan, Peng Yang, Ulrich Kortz, Alejandro Gaita-Ariño, and Eugenio Coronado. "Molecular spin qubits based on lanthanide ions encapsulated in cubic polyoxopalladates: design criteria to enhance quantum coherence." Inorganic Chemistry Frontiers 2, no. 10 (2015): 893–97. http://dx.doi.org/10.1039/c5qi00142k.

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17

Sproules, Stephen. "Electronic structure study of divanadium complexes with rigid covalent coordination: potential molecular qubits with slow spin relaxation." Dalton Transactions 50, no. 14 (2021): 4778–82. http://dx.doi.org/10.1039/d1dt00709b.

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18

Bonizzoni, C., A. Ghirri, K. Bader, J. van Slageren, M. Perfetti, L. Sorace, Y. Lan, O. Fuhr, M. Ruben, and M. Affronte. "Coupling molecular spin centers to microwave planar resonators: towards integration of molecular qubits in quantum circuits." Dalton Transactions 45, no. 42 (2016): 16596–603. http://dx.doi.org/10.1039/c6dt01953f.

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19

Yousefjani, Rozhin, and Abolfazl Bayat. "Parallel entangling gate operations and two-way quantum communication in spin chains." Quantum 5 (May 26, 2021): 460. http://dx.doi.org/10.22331/q-2021-05-26-460.

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The power of a quantum circuit is determined through the number of two-qubit entangling gates that can be performed within the coherence time of the system. In the absence of parallel quantum gate operations, this would make the quantum simulators limited to shallow circuits. Here, we propose a protocol to parallelize the implementation of two-qubit entangling gates between multiple users which are spatially separated, and use a commonly shared spin chain data-bus. Our protocol works through inducing effective interaction between each pair of qubits without disturbing the others, therefore, it increases the rate of gate operations without creating crosstalk. This is achieved by tuning the Hamiltonian parameters appropriately, described in the form of two different strategies. The tuning of the parameters makes different bilocalized eigenstates responsible for the realization of the entangling gates between different pairs of distant qubits. Remarkably, the performance of our protocol is robust against increasing the length of the data-bus and the number of users. Moreover, we show that this protocol can tolerate various types of disorders and is applicable in the context of superconductor-based systems. The proposed protocol can serve for realizing two-way quantum communication.
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20

Benci, Tesi, Atzori, Sessoli, and Torre. "Spin Dynamics and Phonons, Insights into Potential Molecular Qubits." Proceedings 26, no. 1 (September 5, 2019): 46. http://dx.doi.org/10.3390/proceedings2019026046.

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21

Lunghi, Alessandro, and Stefano Sanvito. "How do phonons relax molecular spins?" Science Advances 5, no. 9 (September 2019): eaax7163. http://dx.doi.org/10.1126/sciadv.aax7163.

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The coupling between electronic spins and lattice vibrations is fundamental for driving relaxation in magnetic materials. The debate over the nature of spin-phonon coupling dates back to the 1940s, but the role of spin-spin, spin-orbit, and hyperfine interactions has never been fully established. Here, we present a comprehensive study of the spin dynamics of a crystal of Vanadyl-based molecular qubits by means of first-order perturbation theory and first-principles calculations. We quantitatively determine the role of the Zeeman, hyperfine, and electronic spin dipolar interactions in the direct mechanism of spin relaxation. We show that, in a high magnetic field regime, the modulation of the Zeeman Hamiltonian by the intramolecular components of the acoustic phonons dominates the relaxation mechanism. In low fields, hyperfine coupling takes over, with the role of spin-spin dipolar interaction remaining the less important for the spin relaxation.
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22

Cardona-Serra, S., and A. Gaita-Ariño. "Vanadyl dithiolate single molecule transistors: the next spintronic frontier?" Dalton Transactions 47, no. 16 (2018): 5533–37. http://dx.doi.org/10.1039/c8dt00139a.

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23

Bader, K., S. H. Schlindwein, D. Gudat, and J. van Slageren. "Molecular qubits based on potentially nuclear-spin-free nickel ions." Physical Chemistry Chemical Physics 19, no. 3 (2017): 2525–29. http://dx.doi.org/10.1039/c6cp08161d.

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24

Najafian, Kaveh, Ziv Meir, and Stefan Willitsch. "From megahertz to terahertz qubits encoded in molecular ions: theoretical analysis of dipole-forbidden spectroscopic transitions in N2+." Physical Chemistry Chemical Physics 22, no. 40 (2020): 23083–98. http://dx.doi.org/10.1039/d0cp03906c.

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25

Robert, Jérôme, Nathalie Parizel, Philippe Turek, and Athanassios K. Boudalis. "Relevance of Dzyaloshinskii–Moriya spectral broadenings in promoting spin decoherence: a comparative pulsed-EPR study of two structurally related iron(iii) and chromium(iii) spin-triangle molecular qubits." Physical Chemistry Chemical Physics 21, no. 35 (2019): 19575–84. http://dx.doi.org/10.1039/c9cp03422f.

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Two related iron(iii) and chromium(iii) spin-triangle molecular qubits show coherent driving of their spins, and decoherence that is not significantly affected by Dzyaloshikskii–Moriya spectral broadenings.
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26

Escalera-Moreno, Luis, José J. Baldoví, Alejandro Gaita-Ariño, and Eugenio Coronado. "Spin states, vibrations and spin relaxation in molecular nanomagnets and spin qubits: a critical perspective." Chemical Science 9, no. 13 (2018): 3265–75. http://dx.doi.org/10.1039/c7sc05464e.

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27

Santanni, Fabio, Andrea Albino, Matteo Atzori, Davide Ranieri, Enrico Salvadori, Mario Chiesa, Alessandro Lunghi, et al. "Probing Vibrational Symmetry Effects and Nuclear Spin Economy Principles in Molecular Spin Qubits." Inorganic Chemistry 60, no. 1 (December 11, 2020): 140–51. http://dx.doi.org/10.1021/acs.inorgchem.0c02573.

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28

Simoni, Mario, Giovanni Amedeo Cirillo, Giovanna Turvani, Mariagrazia Graziano, and Maurizio Zamboni. "Towards Compact Modeling of Noisy Quantum Computers: A Molecular-Spin-Qubit Case of Study." ACM Journal on Emerging Technologies in Computing Systems 18, no. 1 (January 31, 2022): 1–26. http://dx.doi.org/10.1145/3474223.

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Classical simulation of Noisy Intermediate Scale Quantum computers is a crucial task for testing the expected performance of real hardware. The standard approach, based on solving Schrödinger and Lindblad equations, is demanding when scaling the number of qubits in terms of both execution time and memory. In this article, attempts in defining compact models for the simulation of quantum hardware are proposed, ensuring results close to those obtained with standard formalism. Molecular Nuclear Magnetic Resonance quantum hardware is the target technology, where three non-ideality phenomena—common to other quantum technologies—are taken into account: decoherence, off-resonance qubit evolution, and undesired qubit-qubit residual interaction. A model for each non-ideality phenomenon is embedded into a MATLAB simulation infrastructure of noisy quantum computers. The accuracy of the models is tested on a benchmark of quantum circuits, in the expected operating ranges of quantum hardware. The corresponding outcomes are compared with those obtained via numeric integration of the Schrödinger equation and the Qiskit’s QASMSimulator. The achieved results give evidence that this work is a step forward towards the definition of compact models able to provide fast results close to those obtained with the traditional physical simulation strategies, thus paving the way for their integration into a classical simulator of quantum computers.
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29

Timco, Grigore, Simone Marocchi, Elena Garlatti, Claire Barker, Morten Albring, Valerio Bellini, Franca Manghi, et al. "Heterodimers of heterometallic rings." Dalton Transactions 45, no. 42 (2016): 16610–15. http://dx.doi.org/10.1039/c6dt01941b.

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30

Mayländer, Maximilian, Su Chen, Emmaline R. Lorenzo, Michael R. Wasielewski, and Sabine Richert. "Exploring Photogenerated Molecular Quartet States as Spin Qubits and Qudits." Journal of the American Chemical Society 143, no. 18 (April 30, 2021): 7050–58. http://dx.doi.org/10.1021/jacs.1c01620.

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31

Timco, Grigore A., Stefano Carretta, Filippo Troiani, Floriana Tuna, Robin J. Pritchard, Christopher A. Muryn, Eric J. L. McInnes, et al. "Engineering the coupling between molecular spin qubits by coordination chemistry." Nature Nanotechnology 4, no. 3 (February 1, 2009): 173–78. http://dx.doi.org/10.1038/nnano.2008.404.

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32

Shiddiq, Muhandis, Dorsa Komijani, Yan Duan, Alejandro Gaita-Ariño, Eugenio Coronado, and Stephen Hill. "Enhancing coherence in molecular spin qubits via atomic clock transitions." Nature 531, no. 7594 (March 2016): 348–51. http://dx.doi.org/10.1038/nature16984.

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33

Yu, Chung-Jui, Stephen von Kugelgen, Matthew D. Krzyaniak, Woojung Ji, William R. Dichtel, Michael R. Wasielewski, and Danna E. Freedman. "Spin and Phonon Design in Modular Arrays of Molecular Qubits." Chemistry of Materials 32, no. 23 (November 22, 2020): 10200–10206. http://dx.doi.org/10.1021/acs.chemmater.0c03718.

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34

Atzori, Matteo, Stefano Benci, Elena Morra, Lorenzo Tesi, Mario Chiesa, Renato Torre, Lorenzo Sorace, and Roberta Sessoli. "Structural Effects on the Spin Dynamics of Potential Molecular Qubits." Inorganic Chemistry 57, no. 2 (December 27, 2017): 731–40. http://dx.doi.org/10.1021/acs.inorgchem.7b02616.

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35

Musfeldt, Janice L., Zhenxian Liu, Diego López-Alcalá, Yan Duan, Alejandro Gaita-Ariño, José J. Baldoví, and Eugenio Coronado. "Vibronic Relaxation Pathways in Molecular Spin Qubit Na9[Ho(W5O18)2]·35H2O under Pressure." Magnetochemistry 9, no. 2 (February 9, 2023): 53. http://dx.doi.org/10.3390/magnetochemistry9020053.

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In order to explore how spectral sparsity and vibronic decoherence pathways can be controlled in a model qubit system with atomic clock transitions, we combined diamond anvil cell techniques with synchrotron-based far infrared spectroscopy and first-principles calculations to reveal the vibrational response of Na9[Ho(W5O18)2]·35H2O under compression. Because the hole in the phonon density of states acts to reduce the overlap between the phonons and f manifold excitations in this system, we postulated that pressure might move the HoO4 rocking, bending, and asymmetric stretching modes that couple with the MJ = ±5, ±2, and ±7 levels out of resonance, reducing their interactions and minimizing decoherence processes, while a potentially beneficial strategy for some molecular qubits, pressure slightly hardens the phonons in Na9[Ho(W5O18)2]·35H2O and systematically fills in the transparency window in the phonon response. The net result is that the vibrational spectrum becomes less sparse and the overlap with the various MJ levels of the Ho3+ ion actually increases. These findings suggest that negative pressure, achieved using chemical means or elongational strain, could further open the transparency window in this rare earth-containing spin qubit system, thus paving the way for the use of device surfaces and interface elongational/compressive strains to better manage decoherence pathways.
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36

Huo, Jian-Li, and Shun-Jin Wang. "Quantum logic gates for spin cluster qubits." Journal of Physics B: Atomic, Molecular and Optical Physics 43, no. 12 (June 1, 2010): 125503. http://dx.doi.org/10.1088/0953-4075/43/12/125503.

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37

Yan, Xiruo, Sebastian Gitt, Becky Lin, Donald Witt, Mahssa Abdolahi, Abdelrahman Afifi, Adan Azem, et al. "Silicon photonic quantum computing with spin qubits." APL Photonics 6, no. 7 (July 1, 2021): 070901. http://dx.doi.org/10.1063/5.0049372.

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38

Freedman, Michael H., Matthew B. Hastings, and Modjtaba Shokrian Zini. "Symmetry Protected Quantum Computation." Quantum 5 (September 28, 2021): 554. http://dx.doi.org/10.22331/q-2021-09-28-554.

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We consider a model of quantum computation using qubits where it is possible to measure whether a given pair are in a singlet (total spin 0) or triplet (total spin 1) state. The physical motivation is that we can do these measurements in a way that is protected against revealing other information so long as all terms in the Hamiltonian are SU(2)-invariant. We conjecture that this model is equivalent to BQP. Towards this goal, we show: (1) this model is capable of universal quantum computation with polylogarithmic overhead if it is supplemented by single qubit X and Z gates. (2) Without any additional gates, it is at least as powerful as the weak model of "permutational quantum computation" of Jordan [14, 18]. (3) With postselection, the model is equivalent to PostBQP.
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39

Porfyrakis, Kyriakos. "(Invited) N@C60 and N@C70 for Quantum Information Processing: Beyond Qubits." ECS Meeting Abstracts MA2022-01, no. 11 (July 7, 2022): 817. http://dx.doi.org/10.1149/ma2022-0111817mtgabs.

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Endohedral fullerenes such as N@C60, where a single atomic nitrogen is trapped inside the fullerene cage, have been proposed as qubit architectures due to the remarkably long relaxation times of their p-electron spins (T1 = 0.375 ms, T2 = 0.25 ms). Molecular quantum computers are still at the fringes of the field as recent developments have focused on other implementations such as superconducting qubits. However, molecular approaches present some advantages such as the ability to use chemical functionalization for scaling up qubit architectures. This, combined with continuous progress on miniaturization of electrodes via e-beam lithography and other techniques, means that molecular approaches will continue to be of interest. In this talk, I will review the field of fullerene-based quantum information processing. I will present progress on the synthesis, chemical functionalization and alignment of N@C60 and N@C70 in different matrices. Recently, we were able to align N@C60 and N@C70 derivatives in a liquid crystal matrix with ordering parameter Ozz = 0.61. With the aligned samples, we were able to achieve addressability of the available 4-electron spin levels in endohedral nitrogen by coherent manipulations. Furthermore, these functionalized molecules give rise to endohedral fullerene qudits: multi-level computational units alternative to the conventional 2-level qubits. Qudits offer a larger state space for encoding information and thus can offer enhancement of quantum algorithm efficiency. Indeed, we were able to demonstrate the first ever geometric phase using pulsed EPR; something that was first proposed over 30 years ago!
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40

Starikova, А. А., M. G. Chegerev, A. G. Starikov, and V. I. Minkin. "Dinuclear cobalt and iron complexes with azomethine derivative of 1,10-phenanthroline: quantum chemical study." Доклады Академии наук 487, no. 1 (July 19, 2019): 36–40. http://dx.doi.org/10.31857/s0869-5652487136-40.

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Geometry, energy and magnetic characteristics of binuclear compounds of 5,6-bis(salicylideneimino)-1,10-phenanthroline with cobalt and iron have been computationally studied by means of density functional theory method (DFT UTPSSh/6-311++G(d, p)). Complexes comprising two magnetically active fragments capable of manifesting spin-crossover and valence tautomerism have been constructed via completion of the coordination sphere of the metal ions with ancillary ligands. These effects provide for variation of spin states in a wide range, which endows the studied compounds properties of molecular switches and spin qubits.
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41

Cimatti, I., L. Bondì, G. Serrano, L. Malavolti, B. Cortigiani, E. Velez-Fort, D. Betto, et al. "Vanadyl phthalocyanines on graphene/SiC(0001): toward a hybrid architecture for molecular spin qubits." Nanoscale Horizons 4, no. 5 (2019): 1202–10. http://dx.doi.org/10.1039/c9nh00023b.

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42

Chiesa, A., F. Petiziol, E. Macaluso, S. Wimberger, P. Santini, and S. Carretta. "Embedded quantum-error correction and controlled-phase gate for molecular spin qubits." AIP Advances 11, no. 2 (February 1, 2021): 025134. http://dx.doi.org/10.1063/9.0000166.

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43

Bader, K., M. Winkler, and J. van Slageren. "Tuning of molecular qubits: very long coherence and spin–lattice relaxation times." Chemical Communications 52, no. 18 (2016): 3623–26. http://dx.doi.org/10.1039/c6cc00300a.

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44

Chen, Jia, Cong Hu, John F. Stanton, Stephen Hill, Hai-Ping Cheng, and Xiao-Guang Zhang. "Decoherence in Molecular Electron Spin Qubits: Insights from Quantum Many-Body Simulations." Journal of Physical Chemistry Letters 11, no. 6 (February 25, 2020): 2074–78. http://dx.doi.org/10.1021/acs.jpclett.0c00193.

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45

Giménez-Santamarina, Silvia, Salvador Cardona-Serra, Juan M. Clemente-Juan, Alejandro Gaita-Ariño, and Eugenio Coronado. "Exploiting clock transitions for the chemical design of resilient molecular spin qubits." Chemical Science 11, no. 39 (2020): 10718–28. http://dx.doi.org/10.1039/d0sc01187h.

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46

Ardavan, Arzhang, Alice M. Bowen, Antonio Fernandez, Alistair J. Fielding, Danielle Kaminski, Fabrizio Moro, Christopher A. Muryn, et al. "Engineering coherent interactions in molecular nanomagnet dimers." npj Quantum Information 1, no. 1 (December 8, 2015). http://dx.doi.org/10.1038/npjqi.2015.12.

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AbstractProposals for systems embodying condensed matter spin qubits cover a very wide range of length scales, from atomic defects in semiconductors all the way to micron-sized lithographically defined structures. Intermediate scale molecular components exhibit advantages of both limits: like atomic defects, large numbers of identical components can be fabricated; as for lithographically defined structures, each component can be tailored to optimise properties such as quantum coherence. Here we demonstrate what is perhaps the most potent advantage of molecular spin qubits, the scalability of quantum information processing structures using bottom-up chemical self-assembly. Using Cr7Ni spin qubit building blocks, we have constructed several families of two-qubit molecular structures with a range of linking strategies. For each family, long coherence times are preserved, and we demonstrate control over the inter-qubit quantum interactions that can be used to mediate two-qubit quantum gates.
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47

Yoneda, J., W. Huang, M. Feng, C. H. Yang, K. W. Chan, T. Tanttu, W. Gilbert, et al. "Coherent spin qubit transport in silicon." Nature Communications 12, no. 1 (July 5, 2021). http://dx.doi.org/10.1038/s41467-021-24371-7.

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AbstractA fault-tolerant quantum processor may be configured using stationary qubits interacting only with their nearest neighbours, but at the cost of significant overheads in physical qubits per logical qubit. Such overheads could be reduced by coherently transporting qubits across the chip, allowing connectivity beyond immediate neighbours. Here we demonstrate high-fidelity coherent transport of an electron spin qubit between quantum dots in isotopically-enriched silicon. We observe qubit precession in the inter-site tunnelling regime and assess the impact of qubit transport using Ramsey interferometry and quantum state tomography techniques. We report a polarization transfer fidelity of 99.97% and an average coherent transfer fidelity of 99.4%. Our results provide key elements for high-fidelity, on-chip quantum information distribution, as long envisaged, reinforcing the scaling prospects of silicon-based spin qubits.
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48

Noiri, Akito, Kenta Takeda, Takashi Nakajima, Takashi Kobayashi, Amir Sammak, Giordano Scappucci, and Seigo Tarucha. "A shuttling-based two-qubit logic gate for linking distant silicon quantum processors." Nature Communications 13, no. 1 (September 30, 2022). http://dx.doi.org/10.1038/s41467-022-33453-z.

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AbstractControl of entanglement between qubits at distant quantum processors using a two-qubit gate is an essential function of a scalable, modular implementation of quantum computation. Among the many qubit platforms, spin qubits in silicon quantum dots are promising for large-scale integration along with their nanofabrication capability. However, linking distant silicon quantum processors is challenging as two-qubit gates in spin qubits typically utilize short-range exchange coupling, which is only effective between nearest-neighbor quantum dots. Here we demonstrate a two-qubit gate between spin qubits via coherent spin shuttling, a key technology for linking distant silicon quantum processors. Coherent shuttling of a spin qubit enables efficient switching of the exchange coupling with an on/off ratio exceeding 1000, while preserving the spin coherence by 99.6% for the single shuttling between neighboring dots. With this shuttling-mode exchange control, we demonstrate a two-qubit controlled-phase gate with a fidelity of 93%, assessed via randomized benchmarking. Combination of our technique and a phase coherent shuttling of a qubit across a large quantum dot array will provide feasible path toward a quantum link between distant silicon quantum processors, a key requirement for large-scale quantum computation.
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49

Piot, N., B. Brun, V. Schmitt, S. Zihlmann, V. P. Michal, A. Apra, J. C. Abadillo-Uriel, et al. "A single hole spin with enhanced coherence in natural silicon." Nature Nanotechnology, September 22, 2022. http://dx.doi.org/10.1038/s41565-022-01196-z.

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AbstractSemiconductor spin qubits based on spin–orbit states are responsive to electric field excitations, allowing for practical, fast and potentially scalable qubit control. Spin electric susceptibility, however, renders these qubits generally vulnerable to electrical noise, which limits their coherence time. Here we report on a spin–orbit qubit consisting of a single hole electrostatically confined in a natural silicon metal-oxide-semiconductor device. By varying the magnetic field orientation, we reveal the existence of operation sweet spots where the impact of charge noise is minimized while preserving an efficient electric-dipole spin control. We correspondingly observe an extension of the Hahn-echo coherence time up to 88 μs, exceeding by an order of magnitude existing values reported for hole spin qubits, and approaching the state-of-the-art for electron spin qubits with synthetic spin–orbit coupling in isotopically purified silicon. Our finding enhances the prospects of silicon-based hole spin qubits for scalable quantum information processing.
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50

Landig, A. J., J. V. Koski, P. Scarlino, C. Müller, J. C. Abadillo-Uriel, B. Kratochwil, C. Reichl, et al. "Virtual-photon-mediated spin-qubit–transmon coupling." Nature Communications 10, no. 1 (November 6, 2019). http://dx.doi.org/10.1038/s41467-019-13000-z.

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Abstract Spin qubits and superconducting qubits are among the promising candidates for realizing a solid state quantum computer. For the implementation of a hybrid architecture which can profit from the advantages of either approach, a coherent link is necessary that integrates and controllably couples both qubit types on the same chip over a distance that is several orders of magnitude longer than the physical size of the spin qubit. We realize such a link with a frequency-tunable high impedance SQUID array resonator. The spin qubit is a resonant exchange qubit hosted in a GaAs triple quantum dot. It can be operated at zero magnetic field, allowing it to coexist with superconducting qubits on the same chip. We spectroscopically observe coherent interaction between the resonant exchange qubit and a transmon qubit in both resonant and dispersive regimes, where the interaction is mediated either by real or virtual resonator photons.
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