Opportunities for Long-Range Magnon-Mediated Entanglement of Spin Qubits via On- and Off-Resonant Coupling

Fukami, Masaya; Candido, Denis R.; Awschalom, D. D.; Flatté, Michael E.

doi:10.1103/prxquantum.2.040314

Cited by 77 publications

(38 citation statements)

References 88 publications

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“…Nonetheless, the spin echo coherence time ( T 2 up to 400 μs) is competitive with near bulk-like properties, and the free induction decay ( T 2 * up to 150 μs) outperforms commercially available bulk material due to the 12 C purification. Therefore, the coherence times presented herein are fully compatible with applications in quantum sensing and hybrid quantum systems. ,, …”

Section: Resultsmentioning

confidence: 74%

“…Therefore, the coherence times presented herein are fully compatible with applications in quantum sensing and hybrid quantum systems. 47 , 50 , 51 …”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the coherence times presented herein are fully compatible with applications in quantum sensing and hybrid quantum systems. 47,50,51 This membrane fabrication technique is also highly amenable to in situ δ-doping of 15 N during overgrowth. 1 δ-Doping allows deterministic incorporation of dopants (N, Ge, Si, etc.)…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Tunable and Transferable Diamond Membranes for Integrated Quantum Technologies

et al. 2021

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Color centers in diamond are widely explored as qubits in quantum technologies. However, challenges remain in the effective and efficient integration of these diamond-hosted qubits in device heterostructures. Here, nanoscale-thick uniform diamond membranes are synthesized via “smart-cut” and isotopically ( 12 C) purified overgrowth. These membranes have tunable thicknesses (demonstrated 50 to 250 nm), are deterministically transferable, have bilaterally atomically flat surfaces ( R q ≤ 0.3 nm), and bulk-diamond-like crystallinity. Color centers are synthesized via both implantation and in situ overgrowth incorporation. Within 110-nm-thick membranes, individual germanium-vacancy (GeV – ) centers exhibit stable photoluminescence at 5.4 K and average optical transition line widths as low as 125 MHz. The room temperature spin coherence of individual nitrogen-vacancy (NV – ) centers shows Ramsey spin dephasing times ( T 2 * ) and Hahn echo times ( T 2 ) as long as 150 and 400 μs, respectively. This platform enables the straightforward integration of diamond membranes that host coherent color centers into quantum technologies.

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Section: Resultsmentioning

confidence: 74%

“…Therefore, the coherence times presented herein are fully compatible with applications in quantum sensing and hybrid quantum systems. 47 , 50 , 51 …”

Section: Resultsmentioning

confidence: 99%

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Tunable and Transferable Diamond Membranes for Integrated Quantum Technologies

et al. 2021

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“…Inspired by studies in the field of plasmonics, where plasmonic surfaces and plasmonic dimers have been shown to support fields with much larger electric field gradients and magnitudes, respectively, we also expect optimization of the geometry of magnonic cavities to be fruitful. For instance, Fukami et al recently predicted that spatial guiding of magnon modes using ferromagnetic bar and waveguide structures dramatically improves the range of spin–spin coupling interactions to more than 2 μm . Finally, coupling of host lattice magnons, which can be driven by ultrafast pulses or phonons, , may offer similar selectivity over arbitrarily long distances, as with host lattice phonon-mediated quantum interfaces.…”

Section: Coupling Mechanisms and Quantum Interfacesmentioning

confidence: 99%

“…For instance, Fukami et al recently predicted that spatial guiding of magnon modes using ferromagnetic bar and waveguide structures dramatically improves the range of spin− spin coupling interactions to more than 2 μm. 88 Finally, coupling of host lattice magnons, which can be driven by ultrafast pulses or phonons, 89,90 may offer similar selectivity over arbitrarily long distances, as with host lattice phononmediated quantum interfaces.…”

Section: Phonons Have Been Envisioned As Universal Quantum Transducer...mentioning

confidence: 99%

Quantum Interfaces to the Nanoscale

2021

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Graphene‐Enhanced Single Ion Detectors for Deterministic Near‐Surface Dopant Implantation in Diamond

Collins,

Jakob,

Robson

et al. 2023

Adv Funct Materials

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Diamond color centers with applications to single photon sources, quantum computation, and magnetic field sensing down to the nanoscale have been investigated using ensembles of near‐surface implanted atoms. Deterministic ion implantation for ions stopping between 30 and 130 nm deep is demonstrated by configuring an electronic‐grade diamond substrate with a biased surface graphene electrode connected to charge sensitive electronics. The thin graphene electrode has a negligible surface dead layer, so implantation events are signaled from the drift of electron–hole pairs induced by the dissipation of ion kinetic energy in the substrate. Ion beam induced charge maps from a scanned 1 MeV He microbeam show the graphene electrode is highly effective with a charge collection efficiency up to 86% compared to an O‐terminated diamond surface of 30%. For lower energy ions, applicable to near surface implantation, single ion detection confidence is >99(1)% for 19.5 keV H and 85(2)% for 24 keV N ions to allow maps of device surface features by employing a focused ion beam microscope or an atomic force microscope cantilever incorporating a nanostencil beam collimator. In the near‐term, this system can be used to investigate the annealing dynamics for the conversion of single implanted ions into diamond color centers.

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Opportunities for Long-Range Magnon-Mediated Entanglement of Spin Qubits via On- and Off-Resonant Coupling

Cited by 77 publications

References 88 publications

Tunable and Transferable Diamond Membranes for Integrated Quantum Technologies

Tunable and Transferable Diamond Membranes for Integrated Quantum Technologies

Quantum Interfaces to the Nanoscale

Graphene‐Enhanced Single Ion Detectors for Deterministic Near‐Surface Dopant Implantation in Diamond

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