Theory of double Cooper-pair tunneling and light emission mediated by a resonator

Morley, William; Marco, A. Di; Mantovani, Mattia; Stadler, Pascal; Belzig, Wolfgang; Rastelli, Gianluca; Armour, A. D.

doi:10.1103/physrevb.100.054515

Cited by 12 publications

(10 citation statements)

References 54 publications

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“…The present work is thus a prime example of the emerging field of mesoscopic quantum electrodynamics of coherent conductors where numerous interesting phenomena were already recently predicted and demonstrated for producing e.g. sub-Poissonian photon sources [12,14,[44][45][46][47][48], novel types of lasers [49][50][51][52], near-quantum limited amplifiers [53,54], squeezed radiation [2,3,5,55], or new types of Q-Bits [56], or two-photon losses [57].…”

Section: Discussionmentioning

confidence: 88%

Generating two continuous entangled microwave beams using a dc-biased Josephson junction

Peugeot,

Ménard,

Dambach

et al. 2020

Preprint

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We show experimentally that a dc-biased Josephson junction in series with two microwave resonators emits entangled beams of microwaves leaking out of the resonators. In the absence of a stationary phase reference for characterizing the entanglement of the outgoing beams, we measure second-order coherence functions for proving entanglement up to an emission rate of 2.5 billion photon pairs per second. The experimental results are found in quantitative agreement with theory, proving that the low frequency noise of the dc bias is the main limitation for the coherence time of the entangled beams. This agreement allows us to evaluate the entropy of entanglement of the resonators, and to identify the improvements that could bring this device closer to a useful bright source of entangled microwaves for quantum-technological applications.

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Section: Discussionmentioning

confidence: 88%

Generating two continuous entangled microwave beams using a dc-biased Josephson junction

Peugeot,

Ménard,

Dambach

et al. 2020

Preprint

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“…A coherent state ansatz can be used to obtain a simpler approximate description of the system's dynamics 9,30,31 . The idea is to assume that each mode is in a coherent state, ρ α = N l=1 |α l α l |, described by a complex amplitude α l .…”

Section: Coherent State Ansatzmentioning

confidence: 99%

Josephson photonics with simultaneous resonances

2021

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Inelastic Cooper pair tunneling across a voltage-biased Josephson junction in series with one or more microwave cavities can generate photons via resonant processes in which the energy lost by the Cooper pair matches that of the photon(s) produced. We generalise previous theoretical treatments of such systems to analyse cases where two or more different photon generation processes are resonant simultaneously. We also explore in detail a specific case where generation of a single photon in one cavity mode is simultaneously resonant with the generation of two photons in a second mode. We find that the coexistence of the two resonances leads to effective couplings between the modes which in turn generate entanglement.

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“…A coherent state ansatz can be used to obtain a simpler approximate description of the system's dynamics 9,31,32 . The idea is to assume that each mode is in a coherent state, ρ α = N l=1 |α l α l |, described by a complex amplitude α l .…”

Section: Coherent State Ansatzmentioning

confidence: 99%

Josephson Photonics with Simultaneous Resonances

Wood,

Armour,

Lang

2021

Preprint

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Inelastic Cooper pair tunneling across a voltage-biased Josephson junction in series with one or more microwave cavities can generate photons via resonant processes in which the energy lost by the Cooper pair matches that of the photon(s) produced. We generalise previous theoretical treatments of such systems to analyse cases where two or more different photon generation processes are resonant simultaneously. We also explore in detail a specific case where generation of a single photon in one cavity mode is simultaneously resonant with the generation of two photons in a second mode. We find that the competition between the two resonances leads to entanglement of the modes.

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Theory of double Cooper-pair tunneling and light emission mediated by a resonator

Cited by 12 publications

References 54 publications

Generating two continuous entangled microwave beams using a dc-biased Josephson junction

Generating two continuous entangled microwave beams using a dc-biased Josephson junction

Josephson photonics with simultaneous resonances

Josephson Photonics with Simultaneous Resonances

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