High cooperativity coupling to nuclear spins on a circuit quantum electrodynamics architecture

Rollano, V.; Ory, Marina Calero de; Buch, Christian Dirk; Rubín-Osanz, Marcos; Zueco, David; Sánchez-Azqueta, Carlos; Chiesa, Alessandro; Granados, Daniel; Carretta, S.; Gómez, A.; Piligkos, Stergios; Luìs, Fernando

doi:10.1038/s42005-022-01017-8

Cited by 19 publications

(24 citation statements)

References 70 publications

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“…This could be done by employing a multimode resonator; it has been suggested that excitation bandwidths of 4 GHz could be possible . Alternatively, one could employ an architecture based on superconducting resonators, where frequencies differing by more than a factor of 7 have already been demonstrated . These devices typically operate in the few tens of GHz range .…”

Section: Discussionmentioning

confidence: 99%

Five-Spin Supramolecule for Simulating Quantum Decoherence of Bell States

et al. 2022

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We report a supramolecule that contains five spins of two different types and with, crucially, two different and predictable interaction energies between the spins. The supramolecule is characterized, and the interaction energies are demonstrated by electron paramagnetic resonance (EPR) spectroscopy. Based on the measured parameters, we propose experiments that would allow this designed supramolecule to be used to simulate quantum decoherence in maximally entangled Bell states that could be used in quantum teleportation.

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Section: Discussionmentioning

confidence: 99%

Five-Spin Supramolecule for Simulating Quantum Decoherence of Bell States

et al. 2022

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“…The inherent limitation of pulsing at multiple resonance frequencies to achieve the necessary entangled states may be realised using circuit quantum electrodynamic (QED) architectures, as applied recently to Yb(trensal) molecular spin qubits. [52] The weak dipolar interactions in the multi-qubit model system necessitate long pulses to implement the corresponding gate operations, however optimal control pulse shaping techniques may circumvent this by reducing the probability of unwanted transitions, even with fast pulses. [53] Moreover, stronger dipolar interactions obtained by chemically controlling the inter-qubit distance would not be detrimental to such a protocol as a result of the individually addressable gvalues of each spin qubit.…”

Section: Methodsmentioning

confidence: 99%

Modelling Conformational Flexibility in a Spectrally Addressable Molecular Multi‐Qubit Model System

et al. 2022

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Dipolar coupled multi-spin systems have the potential to be used as molecular qubits. Herein we report the synthesis of a molecular multi-qubit model system with three individually addressable, weakly interacting, spin 1 = 2 centres of differing g-values. We use pulsed Electron Paramagnetic Resonance (EPR) techniques to characterise and separately address the individual electron spin qubits; Cu II , Cr 7 Ni ring and a nitroxide, to determine the strength of the inter-qubit dipolar interaction. Orientation selective Relaxation-Induced Dipolar Modulation Enhancement (os-RIDME) detecting across the Cu II spectrum revealed a strongly correlated Cu II -Cr 7 Ni ring relationship; detecting on the nitroxide resonance measured both the nitroxide and Cu II or nitroxide and Cr 7 Ni ring correlations, with switchability of the interaction based on differing relaxation dynamics, indicating a handle for implementing EPR-based quantum information processing (QIP) algorithms.

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“…Transmission measurements detected the regime of high cooperative coupling (Ω > κ, γ) of resonator photons to both electron and nuclear spins. 80 The spectral map reflecting one of the nuclear spin transitions in 173 Yb(trensal) is shown in Figure 4i. Avoided crossing at around 17 mT is clearly visible, similar to the one in Figure 4d, while the driving frequency is one order of magnitude lower for nuclear spin transitions.…”

Section: Hybrid Msqds: Coupling Molecular Spins To Photons Of a Mw Re...mentioning

confidence: 99%

Toward Molecular Spin Qubit Devices: Integration of Magnetic Molecules into Solid-State Devices

Fursina

Sinitskii

2023

ACS Appl. Electron. Mater.

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We review the progress made in integrating magnetic molecules containing transition metal ions into nanoelectronic solid-state devices and using them as molecular spin qubits. Molecular spin qubits offer numerous advantages over other material platforms, such as being inherently quantum systems with discrete energy levels, having a rich variety of possible chemical designs, and being synthesizable in large quantities with atomic precision. However, the integration of magnetic molecules into practical and scalable molecular spin qubit devices (MSQDs) that offer initialization, coherent control, and readout of quantum spin states remains one of the major bottlenecks on the way toward applications of these systems in quantum computing technologies. We discuss the evolution of the field of MSQDs and review the first successful implementation of essential qubit operations in a single-molecule transistor based on a TbPc 2 molecule. Further development has been achieved through the merging of molecular electronics with the circuit quantum electrodynamics (cQED) approach where molecular spin states can be manipulated by the microwave frequency photons confined in a superconducting waveguide resonator. We discuss examples of such hybrid devices operating via coupling of a superconducting resonator to large spin ensembles, such as bulk samples and thin films. We also review a possible architecture for single-molecule cQED devices and the potential advantages that it offers. Then, we highlight the possibility and benefits of the optical initialization and readout of molecular spin states. This approach has been realized by using an optical pumping technique for the initialization and changes in photoluminescence for the readout of large molecular spin ensembles coupled to a superconducting resonator. The field of MSQDs is highly interdisciplinary, bringing together progress in synthetic chemistry, molecular electronics, cQED, and optical measurements. While it is still in its infancy, there are promising theoretical designs and encouraging proof-of-concept experiments, and we discuss several proposed device architectures that are eagerly awaiting experimental realization. Advances in hybrid MSQDs will open horizons for quantum technologies.

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High cooperativity coupling to nuclear spins on a circuit quantum electrodynamics architecture

Cited by 19 publications

References 70 publications

Five-Spin Supramolecule for Simulating Quantum Decoherence of Bell States

Five-Spin Supramolecule for Simulating Quantum Decoherence of Bell States

Modelling Conformational Flexibility in a Spectrally Addressable Molecular Multi‐Qubit Model System

Toward Molecular Spin Qubit Devices: Integration of Magnetic Molecules into Solid-State Devices

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