Microwave Photon Counter Based on Josephson Junctions

Chen, Yung Fu; Hover, David; Sendelbach, S.; Maurer, Leon; Merkel, Seth; Pritchett, Emily; Wilhelm, Frank K.; McDermott, Robert

doi:10.1103/physrevlett.107.217401

Cited by 227 publications

(210 citation statements)

References 33 publications

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“…The search for longer coherence times of superconducting qubits brought the study of finite-frequency electromagnetic properties of mesoscopic superconductors to the forefront of experimental research [1][2][3][4][5][6] . The majority of experiments until recently was performed on structures using Josephson junctions as "weak" superconductors, and substantial progress in recognizing the coherencelimiting mechanisms was achieved.…”

Section: Pacs Numbersmentioning

confidence: 99%

Frequency-dependent admittance of a short superconducting weak link

2013

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We consider the linear and non-linear electromagnetic responses of a nanowire connecting two bulk superconductors. Andreev states appearing at a finite phase bias substantially affect the finite-frequency admittance of such a wire junction. Electron transitions involving Andreev levels are easily saturated, leading to the nonlinear effects in photon absorption for the sub-gap photon energies. We evaluate the complex admittance analytically at arbitrary frequency and arbitrary, possibly non-equilibrium, occupation of Andreev levels. Special care is given to the limits of a single-channel contact and a disordered metallic weak link. We also evaluate the quasi-static fluctuations of admittance induced by fluctuations of the occupation factors of Andreev levels. In view of possible qubit applications, we compare properties of a weak link with those of a tunnel Josephson junction. Compared to the latter, a weak link has smaller low-frequency dissipation. However, because of the deeper Andreev levels, the low-temperature quasi-static fluctuations of the inductance of a weak link are exponentially larger than of a tunnel junction. These fluctuations limit the applicability of nanowire junctions in superconducting qubits

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Section: Pacs Numbersmentioning

confidence: 99%

Frequency-dependent admittance of a short superconducting weak link

2013

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“…Recent works using current biased Josephson Junctions (CBJJ) have made both experimental [19] and theoretical [20][21][22] progress towards a single microwave photon detector. The aim of this work is to contribute to these developments by studying the response of the CBJJ coupled to a λ/4-resonator in the few photon regime (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Quantized resonator field coupled to a current-biased Josephson junction in circuit QED

et al. 2014

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“…Namely, a single photon deterministically excites the qubit. Therefore, by performing the dispersive quantum-nondemolition readout of the qubit [23,24] within a relatively long qubit lifetime (∼ γ −1 ), we can apply this setup to the detection of single microwave photons [25][26][27]. A large dispersive shift is advantageous also in this regard.…”

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confidence: 99%

Implementation of an Impedance-MatchedΛSystem by Dressed-State Engineering

et al. 2013

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In one-dimensional optical setups, light-matter interaction is drastically enhanced by the interference between the incident and scattered fields. Particularly, in the impedance-matched Λ-type three-level systems, a single photon deterministically induces the Raman transition and switches the electronic state of the system. Here we show that such a Λ system can be implemented by using dressed states of a driven superconducting qubit and a resonator. The input microwave photons are perfectly absorbed and are down-converted into other frequency modes in the same waveguide. The proposed setup is applicable to single-photon detection in the microwave domain.PACS numbers: 03.67. Lx, 85.25.Cp, 42.50.Pq In one-dimensional optical setups, radiation from a quantum emitter is guided completely to specified onedimensional propagating modes. We can realize such setups in a variety of physical systems, such as optical cavity quantum electrodynamics (QED) systems using atoms or quantum dots [1][2][3] and circuit QED systems using superconducting qubits [4][5][6]. When we apply a field to excite the emitter through the one-dimensional mode in these setups, the incident field inevitably interferes with the field scattered by the emitter due to the low dimensionality [7]. As a result, we can realize unique optical phenomena that are not achievable in three-dimensional free space. A classical example is the complete transmission of a resonant field through a two-sided cavity, in which reflection from the cavity is forbidden due to the destructive interference between the incident field and the cavity emission in the reflection direction. Such one-dimensional optical setups in which reflection from the emitter is forbidden are called impedance-matched, in analogy with properly terminated electric circuits [8,9]. Recently, perfect reflection of the incident field by a single emitter has been confirmed in both optical cavity QED and circuit QED systems [2,4]. Here, transmission is forbidden by the destructive interference occurring in the transmission direction.In this study, we investigate a three-level Λ system interacting with a semi-infinite one-dimensional field in a reflection geometry (Fig. 1). We denote the three levels of the Λ system by |g , |m and |e from the lowest. We assume that |m decays to |g with a finite lifetime and therefore that the system is in |g when stationary. When a single photon resonant to the |g → |e transition is input, there are three possible processes: (a) simple reflection without exciting the system, (b) elastic scattering, inducing the |g → |e → |g transitions, and (c) inelastic scattering, inducing the |g → |e → |m → |g transitions. Destructive interference occurs here between processes (a) and (b). In particular, they cancel each other completely when the two decay rates from the top level |e are identical (Γ eg = Γ em ) and the coherence length of the input photon is sufficiently long. As a result, the input photon is down-converted deterministically, inducing the Raman transition in the sy...

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Microwave Photon Counter Based on Josephson Junctions

Cited by 227 publications

References 33 publications

Frequency-dependent admittance of a short superconducting weak link

Frequency-dependent admittance of a short superconducting weak link

Quantized resonator field coupled to a current-biased Josephson junction in circuit QED

Implementation of an Impedance-MatchedΛSystem by Dressed-State Engineering

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