Multiphoton Coherent Manipulation in Large-Spin Qubits

Bertaina, Sylvain; Chen, Lin; Groll, Nickolas; Tol, Johan van; Dalal, Naresh S.; Chiorescu, Irinel

doi:10.1103/physrevlett.102.050501

Cited by 51 publications

(57 citation statements)

References 27 publications

(36 reference statements)

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“…We experimentally demonstrated the possibility to perform up to 100 simple one-qubit operations on various X-band EPR transitions of the lowest electronic 8 7 2 S multiplet (this figure can be potentially increased to ~ 10 3 using the off-resonance and the rotation angle error correction schemes). In comparison with the previously studied spin-5/2 systems [16][17][18], the present system offers somewhat larger …”

Section: A Epr Spectra and Transitionsmentioning

confidence: 99%

Coherent spin dynamics in a gadolinium-dopedCaWO4crystal

et al. 2017

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We report the first observation of Rabi oscillations in the spin-7/2 ensemble of trivalent gadolinium ions hosted in CaWO4 single crystal. A number of transitions within the lowest electronic multiplet S of Gd 3+ ion are studied using a combination of continuous-wave and pulsed electron paramagnetic resonance spectroscopy. The corresponding Rabi damping curves and the spin coherence times are detected at varying strengths of the microwave field. These data are well reproduced by a theoretical model which accounts for the intrinsic inhomogeneity of the microwave field within the microwave resonator and the magnetic dipole interactions in the diluted spin ensemble. The results indicate that the studied 8-level ground manifold of Gd 3+ ion can represent an effective three-qubit quantum system.

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Section: A Epr Spectra and Transitionsmentioning

confidence: 99%

Coherent spin dynamics in a gadolinium-dopedCaWO4crystal

et al. 2017

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“…Typical implementations of these qubits are molecule-based magnets [3][4][5][6] , nitrogen-vacancy (NV) centers in diamond 7 and quantum spins in crystals [8][9][10][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.…”

mentioning

confidence: 99%

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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“…Other important experimental parameters are the sample temperature and external field orientation (parameter p). In the current work, the temperature was set at 50 K which provides a long enough Rabi coherence time (∼ 1µs), while keeping the relaxation time sufficiently short to ensure a fast acquisition time 6,12 . Thus, the waiting time between the pump and probe pulses was set at 3 µs, larger than the decoherence time, but shorter than the relaxation time.…”

Section: Methodsmentioning

confidence: 99%

“…Fundamental and technological advances can be achieved by strongly coupling spins with photons in a cavity [8][9][10] , leading to a new type of hybrid quantum memory 11 . Recently, we proposed a tunable multi-level system as a potential candidate for multiqubit implementation 6,12 which could be used to implement Grover's algorithm [13][14][15] for instance. We describe in this work a two-tone experiment using the S = 5/2 spin of Mn 2+ ions diluted in MgO.…”

Section: Introductionmentioning

confidence: 99%

Resonant single-photon and multiphoton coherent transitions in a detuned regime

et al. 2015

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We performed quantum manipulations of the multi-level spin system S=5/2 of a Mn 2+ ion, by means of a two-tone pulse drive. The detuning between the excitation and readout radio frequency pulses allows one to select the number of photons involved in a Rabi oscillation as well as increase the frequency of this nutation. Thus detuning can lead to a resonant multi-photon process. Our analytical model for a two-photon process as well as a numerical generalization fit well the experimental findings, with implications in the use of multi-level spin systems as tunable solid state qubits.

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Multiphoton Coherent Manipulation in Large-Spin Qubits

Cited by 51 publications

References 27 publications

Coherent spin dynamics in a gadolinium-dopedCaWO4crystal

Coherent spin dynamics in a gadolinium-dopedCaWO4crystal

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

Resonant single-photon and multiphoton coherent transitions in a detuned regime

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