Magnetic strong coupling in a spin-photon system and transition to classical regime

Chiorescu, Irinel; Groll, Nickolas; Bertaina, Sylvain; Mori, Toshiyuki; Miyashita, Seiji

doi:10.1103/physrevb.82.024413

Cited by 90 publications

(113 citation statements)

References 27 publications

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“…At the same time, the quasi-harmonic nature of the system can lead to interesting effects, where the two-or multi-level nature of a system can be interchanged and tuned 2 . Spin systems benefit from relatively large coherence and relaxation times, which makes them suitable as quantum bit implementations or as a new type of quantum random access memory 6,10,18,27 . In some studies, spin qubits operation is demonstrated at temperatures up to ambient 1 .…”

Section: Introductionmentioning

confidence: 99%

Tunable multiphoton Rabi oscillations in an electronic spin system

et al. 2011

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We report on multi-photon Rabi oscillations and controlled tuning of a multi-level system at room temperature (S = 5/2 for Mn 2+ :MgO) in and out of a quasi-harmonic level configuration. The anisotropy is much smaller than the Zeeman splittings, such as the six level scheme shows only a small deviation from an equidistant diagram. This allows us to tune the spin dynamics by either compensating the cubic anisotropy with a precise static field orientation, or by microwave field intensity. Using the rotating frame approximation, the experiments are very well explained by both an analytical model and a generalized numerical model. The calculated multi-photon Rabi frequencies are in excellent agreement with the experimental data.

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Section: Introductionmentioning

confidence: 99%

Tunable multiphoton Rabi oscillations in an electronic spin system

et al. 2011

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“…SEs of organic radicals can thus combine narrow magnetic transitions and high spin densities. For this reason, they are particularly suitable for reaching the strong coupling regime in a microwave cavity [18][19][20], while their versatility inspires the implementation of quantum gates [21].Here we exploit these features in order to demonstrate the coherent coupling between distinguishable SEs. By using (3,5-dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl radicals (PyBTM) [22], we first show that the strong-coupling regime is largely achieved in a broad temperature range, with values of the cooperativity reaching 4300 at 2 K. This allows us to provide an experimental evidence of the coherent coupling between up to three spatially separated SEs, mediated by the cavity mode of a high T c YBCO/sapphire coplanar resonator.…”

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Coherently coupling distinct spin ensembles through a high-Tcsuperconducting resonator

et al. 2016

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The problem of coupling multiple spin ensembles through cavity photons is revisited by using PyBTM organic radicals and a high-Tc superconducting coplanar resonator. An exceptionally strong coupling is obtained and up to three spin ensembles are simultaneously coupled. The ensembles are made physically distinguishable by chemically varying the g factor and by exploiting the inhomogeneities of the applied magnetic field. The coherent mixing of the spin and field modes is demonstrated by the observed multiple anticrossing, along with the simulations performed within the input-output formalism, and quantified by suitable entropic measures.PACS numbers: 33.90.+h, 75.50.Xx, 76.30Rn, 07.57.Pt Controlling light-matter interaction at the quantum level is a central problem in modern physics and technology. The paradigmatic system for such investigation is represented by a two-level emitter coupled to a confined mode of the electromagnetic field [1]. The experimental benchmark of a coherent light-matter interaction is the creation of hybridized modes, which can be observed if the coupling between the field and the emitter is larger than that between these and environment. This strongcoupling regime has been achieved by employing a variety of emitters, ranging from Rydberg atoms to superconducting qubits, all characterized by large electric-dipole transition amplitudes [2]. Spin-photon coupling is much weaker, but can be dramatically enhanced by exploiting cooperative phenomena in N -spin ensembles (SEs) [3,4]. In this way, the strong coupling regime has been demonstrated with different spin systems in high quality factor microwave resonators [5][6][7][8]. Along the same lines, experimental evidence of the coherent coupling between 3D-cavity photons and magnons in ferro-and ferri-magnetic crystals has been provided [9-11].Molecular spin systems display features that are potentially exploitable in quantum-information processing [12], such as a wide tunability of the physical parameters and decoherence times exceeding 10 3 the gating times at liquid nitrogen temperature [13][14][15][16]. Organic radicals provide possibly the simplest spin systems, consisting of single unpaired electrons with isotropic g-factors.In addition, the presence of intermolecular exchange interactions in non-diluted ensembles gives rise to exchange narrowing, which averages out the intermolecular dipolar and hyperfine interactions [17]. SEs of organic radicals can thus combine narrow magnetic transitions and high spin densities. For this reason, they are particularly suitable for reaching the strong coupling regime in a microwave cavity [18][19][20], while their versatility inspires the implementation of quantum gates [21].Here we exploit these features in order to demonstrate the coherent coupling between distinguishable SEs. By using (3,5-dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl radicals (PyBTM) [22], we first show that the strong-coupling regime is largely achieved in a broad temperature range, with values of the cooperativity reachi...

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“…Multi-level systems are promising for implementing few-qubits algorithms 12 or as quantum memories [13][14][15][16] . For quantum technology applications, a higher sensitivity electron spin resonance (ESR) measurement is needed to be able to manipulate spins in mesoscopic crystals placed on superconducting chips [17][18][19][20][21] .…”

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Sensitive spin detection using an on-chip SQUID-waveguide resonator

Yue

Chen

Barreda

et al. 2017

Applied Physics Letters

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Precise detection of spin resonance is of paramount importance to achieve coherent spin control in quantum computing. We present a novel setup for spin resonance measurements, which uses a dc-SQUID flux detector coupled to an antenna from a coplanar waveguide. The SQUID and the waveguide are fabricated from 20 nm Nb thin film, allowing high magnetic field operation with the field applied parallel to the chip. We observe a resonance signal between the first and third excited states of Gd spins S = 7/2 in a CaWO 4 crystal, relevant for state control in multi-level systems.Solid state spin-based qubits are studied for quantum computing due to their relatively long coherence time 1,2 . Typical implementations of these qubits are molecule-based magnets 3-6 , nitrogen-vacancy (NV) centers in diamond 7 and quantum spins in crystals 8-11 . These spin-based qubits are designed such that the spins are well separated in the crystal, leading to an increased decoherence time due to weak spin dipolar interactions.Among the rare-earth ions, S-state lanthanide ions doped in a crystal have a rich energy level structure due to their large spin. Multi-level systems are promising for implementing few-qubits algorithms 12 or as quantum memories [13][14][15][16] . For quantum technology applications, a higher sensitivity electron spin resonance (ESR) measurement is needed to be able to manipulate spins in mesoscopic crystals placed on superconducting chips [17][18][19][20][21] .Compared to other ultra-high sensitivity ESR measurements 22,23 , the use of Josephson junctions can increase significantly the spatial resolution of the magnetic detection while allowing an on-chip implementation. For instance, the magnetic signal of one nanoparticle is detectable if placed on the junction of a micrometer sized superconducting quantum interference device (micro-SQUID) 24 . We present a novel setup for ESR measurements, which combines the high spin sensitivity of an on-chip micro-SQUID and the flexibility of a coplanar waveguide for microwave excitation. Different dc-SQUID implementations were also used to detect molecular 25,26 and diluted 27 spins. In our case, the coupling of the two devices generates a cavity effect, which amplifies the microwave power seen by the spins. When using micro-SQUIDs, the samples are positioned close to their loop for increased sensitivity since the device a) Electronic mail: gy10c@my.fsu.edu b) Electronic mail: ic@magnet.fsu. edu FIG. 1. (color online) Scanning electron micrograph of the device and of the micro-SQUID (inset). The darker (blue) area is the coplanar waveguide with the two Ω-loop shortcircuits between the central line and the lateral ground planes. The microwave excitation is depicted by the curvy arrow and an in-plane field B0 is generated by an external coil. The SQUIDs share a common ground (sketched as a white rectangle). Each SQUID has one I − V line shown in green for clarity in their narrowest region.can work under in-plane magnetic fields in the range of ∼Tesla [28][29][30] .Using this s...

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Magnetic strong coupling in a spin-photon system and transition to classical regime

Cited by 90 publications

References 27 publications

Tunable multiphoton Rabi oscillations in an electronic spin system

Tunable multiphoton Rabi oscillations in an electronic spin system

Coherently coupling distinct spin ensembles through a high-Tcsuperconducting resonator

Sensitive spin detection using an on-chip SQUID-waveguide resonator

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