Realizing a Circuit Analog of an Optomechanical System with Longitudinally Coupled Superconducting Resonators

Eichler, Christopher; Petta, J. R.

doi:10.1103/physrevlett.120.227702

Cited by 45 publications

(33 citation statements)

References 61 publications

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“…We show that this strategy does not depend on what Hamiltonian is used to read the qubit. However, we make the assumption that the state of the system (qubit + cavity) is at all times in a state ρ = a |g, α g (t) g, α g (t)| + b |e, α e (t) e, α e (t)| + c |e, α e (t) g, α g (t)| + d |g, α g (t) e, α e (t)| (20) From this we usually perform a polaron transform [5,12]. Here, we first displace the cavity to the barycenter of the two coherent states (α g + α e )/2.…”

Section: Dephasing Rate and Efficiencymentioning

confidence: 99%

Gated Conditional Displacement Readout of Superconducting Qubits

et al. 2019

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We have realized a new interaction between superconducting qubits and a readout cavity that results in the displacement of a coherent state in the cavity, conditioned on the state of the qubit. This conditional state, when it reaches the cavity-following, phase-sensitive amplifier, matches its measured observable, namely the in-phase quadrature. In a setup where several qubits are coupled to the same readout resonator, we show it is possible to measure the state of a target qubit with minimal dephasing of the other qubits. Our results suggest novel directions for faster readout of superconducting qubits and implementations of bosonic quantum error-correcting codes.

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Section: Dephasing Rate and Efficiencymentioning

confidence: 99%

Gated Conditional Displacement Readout of Superconducting Qubits

et al. 2019

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“…Very recently, photon-pressure–coupled circuits are also discussed as in the context of fault-tolerant quantum computing using bosonic codes ( 29 ) and quantum-enhanced dark matter axion detection at low-energy scales ( 43 , 44 ). To date, however, photon-pressure–coupled superconducting circuits have only been realized in the classical regime and in the presence of large residual thermal fluctuations ( 25 , 26 ).…”

Section: Introductionmentioning

confidence: 99%

Cooling photon-pressure circuits into the quantum regime

2021

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Quantum control of electromagnetic fields was initially established in the optical domain and has been advanced to lower frequencies in the gigahertz range during the past decades extending quantum photonics to broader frequency regimes. In standard cryogenic systems, however, thermal decoherence prevents access to the quantum regime for photon frequencies below the gigahertz domain. Here, we engineer two superconducting LC circuits coupled by a photon-pressure interaction and demonstrate sideband cooling of a hot radio frequency (RF) circuit using a microwave cavity. Because of a substantially increased coupling strength, we obtain a large singlephoton quantum cooperativity 𝒞 𝒞 q0 ∼ 1 and reduce the thermal RF occupancy by 75% with less than one pump photon. For larger pump powers, the coupling rate exceeds the RF thermal decoherence rate by a factor of 3, and the RF circuit is cooled into the quantum ground state. Our results lay the foundation for RF quantum photonics.

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“…(C) Electronic circuits composed of transmon qubits in superconducting cavities [48] have been identified as possible HD [19]. The analog of a mechanical mode in such circuits may be implemented by a transmission line and optomechanical-like coupling can be induced between superconducting microwave resonators [49,50]. Fig.…”

Section: Experimental Realizationsmentioning

confidence: 99%

Minimal quantum heat manager boosted by bath spectral filtering

Naseem

Misra

Müstecaplıoğlu

et al. 2020

Phys. Rev. Research

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We reveal the potentially important role of a general mechanism in quantum heat management schemes, namely, spectral filtering of the coupling between the heat baths in the setup and the quantum system that controls the heat flow. Such filtering is enabled by interfaces between the system and the baths by means of harmonic-oscillator modes whose resonant frequencies and coupling strengths are used as control parameters of the system-bath coupling spectra. We show that this uniquely quantum-electrodynamic mechanism, here dubbed bath spectral filtering, boosts the performance of a minimal quantum heat manager comprised of two interacting qubits or an analogous optomechanical system, allowing this device to attain either perfect heat diode action or strongly enhanced heat transistor action.

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Realizing a Circuit Analog of an Optomechanical System with Longitudinally Coupled Superconducting Resonators

Cited by 45 publications

References 61 publications

Gated Conditional Displacement Readout of Superconducting Qubits

Gated Conditional Displacement Readout of Superconducting Qubits

Cooling photon-pressure circuits into the quantum regime

Minimal quantum heat manager boosted by bath spectral filtering

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