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Crossed broadband coplanar-waveguide circuits for extension of the spin dephasing time T2* of NV-center ensembles in bulk diamonds

T. Sekiguchi, Yuki Kamitsubo, 増山雄太 +8 more

The Japan Society of Applied PhysicsMar 18, 20210 citations

Cross-type two-layer coplanar waveguide circuit toward spin-noise decoupling of ensemble NV centers in large-volume diamond

Yuki Kamitsubo, Y. MASUYAMA, T. Sekiguchi +5 more

The Japan Society of Applied PhysicsJan 28, 20200 citations

Improving spin dephasing time of perfectly aligned NV center in CVD diamond

Tzyy Zheng Neo, 睦子波多野, Mutsuko Hatano +2 more

Oct 1, 20240 citations

Long dephasing time of NV center spins in diamond layers formed by hot ion implantation and high pressure high temperature annealing

V. P. Popov, Sergey N. Podlesny, I. A. Kartashov +2 more

Crossed two-layer coplanar-waveguide circuit for extending spin dephasing time T2* of ensemble NV centers in a bulk diamond

Y. Kamitsubo, T. Sekiguchi, Masuyama Yuta +10 more

The nitrogen-vacancy (NV) center in diamond is extensively studied for a next-generation high-sensitivity magnetometer. The DC magnetic sensitivity can be improved by extending the inhomogeneous spin dephasing time through suppressing the effects of inhomogeneous fluctuations or by increasing the number of effective NV centers through expanding the sensor volume. It has been demonstrated that strain-induced dephasing can be suppressed by double quantum (DQ) technique with two-tone microwaves (MW), and spin bath-induced dephasing can be suppressed by spin bath drive (SBD) technique with multi-tone radio-frequency (RF) to drive the P1 centers. To combine these T2* -extension techniques with a bulk diamond, it is necessary to apply MW and RF uniformly to the sample. A coplanar waveguide (CPW) circuit has been reported to be useful for uniform microwave irradiation to a bulk sample. In this study, we reports the newly designed and fabricated a cross-aligned two-layer CPW circuit.The nitrogen-vacancy (NV) center in diamond is extensively studied for a next-generation high-sensitivity magnetometer. The DC magnetic sensitivity can be improved by extending the inhomogeneous spin dephasing time through suppressing the effects of inhomogeneous fluctuations or by increasing the number of effective NV centers through expanding the sensor volume. It has been demonstrated that strain-induced dephasing can be suppressed by double quantum (DQ) technique with two-tone microwaves (MW), and spin bath-induced dephasing can be suppressed by spin bath drive (SBD) technique with multi-tone radio-frequency (RF) to drive the P1 centers. To combine these T2* -extension techniques with a bulk diamond, it is necessary to apply MW and RF uniformly to the sample. A coplanar waveguide (CPW) circuit has been reported to be useful for uniform microwave irradiation to a bulk sample. In this study, we reports the newly designed and fabricated a cross-aligned two-layer CPW circuit.

Dec 17, 20200 citations

Microwave-induced fluorescence of ensemble NV centers using PCB-based RF devices for quantum sensing

Atefe Safinezhad, Aashutosh Kumar, Richard Al Hadi +1 more

Nitrogen-vacancy (NV) centers in diamond are solid-state quantum sensors that operate at room temperature and allow optical readout of spin states through optically detected magnetic resonance (ODMR). Reliable ODMR measurements need controlled microwave excitation to manipulate NV spin states and modulate their fluorescence. In this paper, we report on ensemble NV centers’ interaction with microwave fields transmitted by printed-circuit-board (PCB) radio-frequency (RF) devices. Two microwave structures, a coplanar waveguide transmission line (CPW-TL) and a single-finger interdigitated capacitor (IDC), are designed and impedance-matched at the NV zero-field splitting frequency. Nanodiamond solutions containing NV ensembles are deposited as few-microliter droplets onto the PCB devices and dried, forming localized NV layers on the RF structures. Two-dimensional fluorescence scans are used to link spatial changes in NV fluorescence to the microwave field distributions created by each device geometry. CPW-TLs enable interaction over extended regions along the transmission line, while IDCs produce localized excitation near the capacitive gaps.Nitrogen-vacancy (NV) centers in diamond are solid-state quantum sensors that operate at room temperature and allow optical readout of spin states through optically detected magnetic resonance (ODMR). Reliable ODMR measurements need controlled microwave excitation to manipulate NV spin states and modulate their fluorescence. In this paper, we report on ensemble NV centers’ interaction with microwave fields transmitted by printed-circuit-board (PCB) radio-frequency (RF) devices. Two microwave structures, a coplanar waveguide transmission line (CPW-TL) and a single-finger interdigitated capacitor (IDC), are designed and impedance-matched at the NV zero-field splitting frequency. Nanodiamond solutions containing NV ensembles are deposited as few-microliter droplets onto the PCB devices and dried, forming localized NV layers on the RF structures. Two-dimensional fluorescence scans are used to link spatial changes in NV fluorescence to the microwave field distributions created by each device geometry. CPW-TLs enable interaction over extended regions along the transmission line, while IDCs produce localized excitation near the capacitive gaps.

Photonics for Quantum (PfQ)Jul 22, 20260 citations

Crossed two-layer coplanar-waveguide circuit for extending spin dephasing time T2* of ensemble NV centers in a bulk diamond

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Crossed two-layer coplanar-waveguide circuit for extending spin dephasing time T2* of ensemble NV centers in a bulk diamond

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