Energy downconversion between classical electromagnetic fields via a quantum mechanical SQUID ring

Everitt, Mark J.; Clark, T. D.; Stiffell, P.B.; Ralph, Jason F.; Harland, C.J.

doi:10.1103/physrevb.72.094509

Cited by 4 publications

(5 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[10]. Examples of spin ensembles are cold-atomic gases, nitrogen-vacancy (NV) centers in diamonds, and rare-earth-doped crystals, of which the strong coupling of a magnetic-dipole transition with a microwave resonator has been recently experimentally demonstrated [11][12][13][14][15][16][17]. Such a great variety of spin ensembles exhibit different features, which require the application of adequate conversion protocols [18].…”

Section: Introductionmentioning

confidence: 98%

Interfacing microwave qubits and optical photons via spin ensembles

et al. 2015

View full text Add to dashboard Cite

A protocol is discussed which allows one to realize a transducer for single photons between the optical and the microwave frequency range. The transducer is a spin ensemble, where the individual emitters possess both an optical and a magnetic-dipole transition. Reversible frequency conversion is realized by combining optical photon storage, by means of EIT, with the controlled switching of the coupling between the magnetic-dipole transition and a superconducting qubit, which is realized by means of a microwave cavity. The efficiency is quantified by the global fidelity for transferring coherently a qubit excitation between a single optical photon and the superconducting qubit. We test various strategies and show that the total efficiency is essentially limited by the optical quantum memory: It can exceed 80% for ensembles of NV centers and approaches 99% for cold atomic ensembles, assuming state-of-the-art experimental parameters. This protocol allows one to bridge the gap between the optical and the microwave regime so to efficiently combine superconducting and optical components in quantum networks

show abstract

Section: Introductionmentioning

confidence: 98%

Interfacing microwave qubits and optical photons via spin ensembles

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Indeed with capacitive coupling the external flux is likely to appear in Lindblads at all orders. As the Josephson coupling energy dictates the height of the potential well, and therefore the tunnelling probability, SQUIDs are (notoriously) sensitive to external magnetic fields and so it is reasonable to expect a strong external flux dependence 19,20,53 ; Eq. (30) shows such a dependence lies also within the dissipator.…”

Section: Discussionmentioning

confidence: 99%

Some implications of superconducting quantum interference to the application of master equations in engineering quantum technologies

et al. 2016

Self Cite

View full text Add to dashboard Cite

In this paper we consider the modelling and simulation of open quantum systems from a device engineering perspective. We derive master equations at different levels of approximation for a Superconducting Quantum Interference Device (SQUID) ring coupled to an ohmic bath. We demonstrate that the master equations we consider produce decoherences that are qualitatively and quantitativly dependent on both the level of approximation and the ring's external flux bias. We discuss the issues raised when seeking to obtain Lindbladian dissipation and show, in this case, that the external flux (which may be considered to be a control variable in some applications) is not confined to the Hamiltonian, as often assumed in quantum control, but also appears in the Lindblad terms.

show abstract

“…Thus, we have obtained the system of equations ( 7), ( 8), (10), and (15), which describe the interaction of the classical tank circuit and the quantum circuits (qubits). More accurate (quantum-mechanical) analysis would start the description from the Hamiltonian of the whole system in terms of the operators for both the tank circuit and the qubits with averaging the equations afterwards, as in Ref.…”

Section: Effective Inductance Of Qubitsmentioning

confidence: 99%

“…More accurate (quantum-mechanical) analysis would start the description from the Hamiltonian of the whole system in terms of the operators for both the tank circuit and the qubits with averaging the equations afterwards, as in Ref. [14] (see also the discussion about similar systems in [15] and [16]). Since this analysis would yield the same equations for the observable values (V T = V T , etc.…”

Section: Effective Inductance Of Qubitsmentioning

confidence: 99%

Impedance measurement technique for quantum systems

Shevchenko

2008

Eur. Phys. J. B

View full text Add to dashboard Cite

The impedance measurement technique consists in that the phase-dependent (parametric) inductance of the system is probed by the classical tank circuit via measuring the voltage. The notion of the parametric inductance for the impedance measurement technique is revisited for the case when a quantum system is probed. Measurement of the quantum state of the system of superconducting circuits (qubits) is studied theoretically. It is shown that the result of the measurement is defined by the partial energy levels populations in the qubits.

show abstract

Energy downconversion between classical electromagnetic fields via a quantum mechanical SQUID ring

Cited by 4 publications

References 33 publications

Interfacing microwave qubits and optical photons via spin ensembles

Interfacing microwave qubits and optical photons via spin ensembles

Some implications of superconducting quantum interference to the application of master equations in engineering quantum technologies

Impedance measurement technique for quantum systems

Contact Info

Product

Resources

About