Number-Resolved Photocounter for Propagating Microwave Mode

Dassonneville, Rémy; Assouly, Réouven; Peronnin, Théau; Rouchon, Pierre; Huard, Benjamin

doi:10.1103/physrevapplied.14.044022

Cited by 38 publications

(27 citation statements)

References 57 publications

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“…While surprising when considering the average experiment, it is well explained by a weak-value model. Looking forward, it would be interesting to perform a full quantum tomography of the drive state using newly-developed itinerant mode detectors [36,37] by first displacing the quantum state towards low photon numbers. From a thermodynamic point of view, this measurement backaction on the energy could be used to build new thermodynamic engines that are powered by measurement [38][39][40][41][42][43][44][45][46][47][48][49][50].…”

mentioning

confidence: 99%

Energetics of a Single Qubit Gate

Stevens,

Szombati,

Maffei

et al. 2021

Preprint

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Qubits are physical, a quantum gate thus not only acts on the information carried by the qubit but also on its energy. What is then the corresponding flow of energy between the qubit and the controller that implements the gate? Here we exploit a superconducting platform to answer this question in the case of a quantum gate realized by a resonant drive field. During the gate, the superconducting qubit becomes entangled with the microwave drive pulse so that there is a quantum superposition between energy flows. We measure the energy change in the drive field conditioned on the outcome of a projective qubit measurement. We demonstrate that the drive's energy change associated with the measurement backaction can exceed by far the energy that can be extracted by the qubit. This can be understood by considering the qubit as a weak measurement apparatus of the driving field.

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mentioning

confidence: 99%

Energetics of a Single Qubit Gate

Stevens,

Szombati,

Maffei

et al. 2021

Preprint

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“…In this context, there is a strong incentive to develop efficient and practical detectors operating in the microwave range. Although some detectors for itinerant microwave photons recently managed to reach single-photon sensitivity with efficiencies up to 96% [20][21][22] , they rely on discrete qubit transitions or on cavity-confined photons to facilitate detection 23,24 . This limits signal amplitude calibration to a narrow relative bandwidth 25 with the possibility of extending it to 1 GHz by observing a high-level ac Stark shift in a multilevel quantum system with a large frequency detuning 26,27 , but this extension comes at the cost of reduced energy sensitivity.…”

Section: Mainmentioning

confidence: 99%

Cryogenic power sensor enabling broad-band and traceable measurements

Girard¹,

W.²,

Kokkoniemi³

et al. 2021

Preprint

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Recently, great progress has been made in the field of ultrasensitive microwave detectors, reaching even the threshold for utilization in circuit quantum electrodynamics (cQED). However, these cryogenic sensors lack the ability to perform broad-band metrologically traceable power absorption measurements, which limits their scope of applications. Here, we demonstrate such measurements using an ultralow-noise nanobolometer supplemented by an additional direct-current (dc) input. The tracing of the absorbed power relies on comparing the response of the bolometer between radio frequency (rf) and dc heating powers traced through the Josephson voltage and quantum Hall resistance. To illustrate this technique, we demonstrate a fast calibration process of an attenuated input line over more than nine octaves of bandwidth with an rf heating power of −114 dBm and uncertainty down to 0.33 dB.

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“…gigahertz astronomy and axions search [1][2][3], quantum computing [4] and superconducting electronics [5][6][7], for which very fast, low noise, and extremely sensitive detectors in the microwave-to-Terahertz range are required. Indeed, in recent years the progresses of nanotechnologies for superconducting devices have led to the design of highly sensitive superconducting detectors for electromagnetic radiation, such as transition edge sensors [8,9], kinetic inductance detectors [10], Josephson escape sensors [11] and travelling-wave parametric amplifiers [12,13], highsensitivity calorimeters [14][15][16] and nanobolometers [17], graphene- [18][19][20][21] and qubit-based detectors [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Josephson-based scheme for the detection of microwave photons

Guarcello,

Komnang,

Barone

et al. 2021

Preprint

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We propose a scheme for the detection of microwave induced photons through current-biased Josephson junction, from the point of view of the statistical decision theory. Our analysis is based on the numerical study of the zero voltage lifetime distribution in response to a periodic train of pulses, that mimics the absorption of photons. The statistical properties of the detection are retrieved comparing the thermally induced transitions with the distribution of the switchings to the finite voltage state due to the joint action of thermal noise and of the incident pulses. The capability to discriminate the photon arrival can be quantified through the Kumar-Caroll index, which is a good indicator of the Signal-to-Noise-Ratio. The index can be exploited to identify the system parameters best suited for the detection of weak microwave photons.

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Number-Resolved Photocounter for Propagating Microwave Mode

Cited by 38 publications

References 57 publications

Energetics of a Single Qubit Gate

Energetics of a Single Qubit Gate

Cryogenic power sensor enabling broad-band and traceable measurements

Josephson-based scheme for the detection of microwave photons

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