Stroboscopic Qubit Measurement with Squeezed Illumination

Eddins, Andrew; Schreppler, Sydney; Toyli, D.M.; Martin, Leigh S.; Hacohen-Gourgy, Shay; Govia, Luke C. G.; Ribeiro, Hugo; Clerk, Aashish A.; Siddiqi, Irfan

doi:10.1103/physrevlett.120.040505

Cited by 50 publications

(50 citation statements)

References 39 publications

(60 reference statements)

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“…This triggered the development of practical Josephson parametric amplifier (JPA) devices [16][17][18][19] and follow-up amplifier chains such that the output noise is dominated by quantum fluctuations [20]. Microwave squeezed states [20] can then provide a sizable noise reduction, thus improving measurement sensitivity for qubit state readout [21][22][23][24] and nanomechanical resonator motion detection [25]. They have also been investigated for their effect on the dynamics of quantum systems, such as two-level atoms [26][27][28] or mechanical oscillators [29].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Resonance with Squeezed Microwaves

et al. 2017

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Vacuum fluctuations of the electromagnetic field set a fundamental limit to the sensitivity of a variety of measurements, including magnetic resonance spectroscopy. We report the use of squeezed microwave fields, which are engineered quantum states of light for which fluctuations in one field quadrature are reduced below the vacuum level, to enhance the detection sensitivity of an ensemble of electronic spins at millikelvin temperatures. By shining a squeezed vacuum state on the input port of a microwave resonator containing the spins, we obtain a 1.2-dB noise reduction at the spectrometer output compared to the case of a vacuum input. This result constitutes a proof of principle of the application of quantum metrology to magnetic resonance spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Magnetic Resonance with Squeezed Microwaves

et al. 2017

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“…[38][39][40] Recently, qubits have been utilized for detection of non-classical fields such as squeezed states. [41][42][43][44] Our findings will provide a guide for realizing a sensitive measurement of quantum noise 45 caused by a phase shift of such non-classical fields and will contribute to advances in quantum measurements based on qubits through the sensitive measurement of phase shifts of a complex AC magnetic field.…”

Section: Future Prospectmentioning

confidence: 84%

Sensitive measurement of phase shift of an AC magnetic field by quantum sensing with multiple-pulse decoupling sequences

Ishikawa

Yoshizawa

Mawatari

et al. 2019

Journal of Applied Physics

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Magnetometry utilizing a spin qubit in a solid state possesses high sensitivity. In particular, a magnetic sensor with a high spatial resolution can be achieved with the electron-spin states of a nitrogen vacancy (NV) center in diamond. In this study, we demonstrated that NV quantum sensing based on multiple-pulse decoupling sequences can sensitively measure not only the amplitude but also the phase shift of an alternatingcurrent (AC) magnetic field. In the AC magnetometry based on decoupling sequences, the maximum phase accumulation of the NV spin due to an AC field can be generally obtained when the π-pulse period in the sequences matches the half time period of the field and the relative phase difference between the sequences and the field is zero. By contrast, the NV quantum sensor acquires no phase accumulation if the relative phase difference is π/2. Thus, this phase-accumulation condition does not have any advantage for the magnetometry. However, we revealed that the non-phase-accumulation condition is available for detecting a very small phase shift of an AC field from its initial phase. This finding is expected to provide a guide for realizing sensitive measurement of a complex AC magnetic field in micrometer and nanometer scales.

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“…Notably, this dependence on M remains extremely weak, and the Kerr of the fundamental mode varies by only about a factor of two in the large range of M ∈ [5,200]. We believe such a weak dependence accounts for the fact that arraying has not brought significant improvement of the dynamic range in parametric amplifiers, despite the significant effort in this direction by the community.…”

Section: Effect Of the Array Size On Amplifier Mode Structure Andmentioning

confidence: 97%

“…The improved signal-tonoise ratio brought about by these amplifiers is crucial in applications such as real-time feedback in quantum error correction [1,2] but also simply in quantum benchmarking experiments such as qubit lifetime characterization in superconducting circuits [3,4]. These devices are also used as sources of squeezing for enhancement of detection sensitivity [5,6], and sources of entanglement in continuous variable quantum computing [7,8].…”

Section: Introductionmentioning

confidence: 99%

Josephson Array-Mode Parametric Amplifier

et al. 2020

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We introduce a novel near-quantum-limited amplifier with a large tunable bandwidth and high dynamic range -the Josephson Array Mode Parametric Amplifier (JAMPA). The signal and idler modes involved in the amplification process are realized by the array modes of a chain of 1000 flux tunable, Josephson-junction-based, nonlinear elements. The frequency spacing between array modes is comparable to the flux tunability of the modes, ensuring that any desired frequency can be occupied by a resonant mode, which can further be pumped to produce high gain. We experimentally demonstrate that the device can be operated as a nearly quantum-limited parametric amplifier with 20 dB of gain at almost any frequency within (4−12) GHz band. On average, it has a 3 dB bandwidth of 11 MHz and input 1 dB compression power of −108 dBm, which can go as high as −93 dBm. We envision the application of such a device to the time-and frequency-multiplexed readout of multiple qubits, as well as to the generation of continuous-variable cluster states.

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Stroboscopic Qubit Measurement with Squeezed Illumination

Cited by 50 publications

References 39 publications

Magnetic Resonance with Squeezed Microwaves

Magnetic Resonance with Squeezed Microwaves

Sensitive measurement of phase shift of an AC magnetic field by quantum sensing with multiple-pulse decoupling sequences

Josephson Array-Mode Parametric Amplifier

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