Incoherent-mediator for quantum state transfer in the ultrastrong coupling regime

Cárdenas-López, F. A.; Albarrán-Arriagada, F.; Barrios, G. Alvarado; Retamal, J. C.; Romero, G.

doi:10.1038/s41598-017-04467-1

Cited by 7 publications

(11 citation statements)

References 59 publications

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“…In summary, we have numerically shown that a (or more) nonlinear system(s) coupled to a high-impedance LC circuit can beat the pure oscillators' (classical) limit 2g ≤ √ ω q ω r by engineering suitable parameters. Having obtained and analyzed the Hamiltonian for the two CPBs USC-coupled to an oscillator, let us study the feasibility of using this compound unit as an incoherent mediator [73] to perform a quantum state transfer protocol.…”

Section: Choice Of Parametersmentioning

confidence: 99%

“…However, a successful information exchange often relies on having a highly controllable and coherent third-party quantum system that acts as a mediator/coupler. A radically different approach is to design a protocol which is insensitive to the state of the mediator [73], with the advantage that the coupler does not require preparation or postselection [75].…”

Section: Choice Of Parametersmentioning

confidence: 99%

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Charge qubits in the ultrastrong coupling regime

Cárdenas-López¹,

Yu²,

Andersen³

et al. 2021

Preprint

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We study the feasibility of reaching the ultrastrong (USC) and deep-strong coupling (DSC) regimes of lightmatter interaction, in particular at resonance condition, with a superconducting charge qubit, also known as Cooper-Pair box (CPB). We show that by shunting the charge qubit with a high-impedance LC-circuit, one can maximally reach both USC and DSC regimes exceeding the classical upper bound |g| ≤ √ ωqωr/2 between two harmonic systems with frequencies ωq and ωr. In our case, the fundamental model corresponds to an enhanced quantum Rabi model, which contains a displacement field operator that breaks its internal parity symmetry. Furthermore, we consider a multipartite device consisting of two CPBs ultrastrongly coupled to an oscillator as a mediator and study a quantum state transfer protocol between a pair of transmon qubits, all of them subjected to local incoherent noise channels with realistic parameters. This work opens the door for studying light-matter interactions beyond the quantum Rabi model at extreme coupling strengths, providing a new building block for applications within quantum computation and quantum information processing.

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Section: Choice Of Parametersmentioning

confidence: 99%

Section: Choice Of Parametersmentioning

confidence: 99%

Charge qubits in the ultrastrong coupling regime

Cárdenas-López¹,

Yu²,

Andersen³

et al. 2021

Preprint

Self Cite

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show abstract

“…The light-matter interaction in the USC regime presents interesting properties, such as parity symmetry, and anharmonic energy spectrum [ 32 ]. These properties have led to remarkable applications of systems described by the USC, also termed quantum Rabi systems (QRS), such as fast quantum gates [ 33 ], efficient energy transfer [ 34 , 35 ], and generation of non-classical states [ 36 , 37 ]. Further, current progress in superconducting circuit technology has enabled the manipulation of several parameters of QRSs [ 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

Quantum Mechanical Engine for the Quantum Rabi Model

Barrios

Peña

Albarrán-Arriagada

et al. 2018

Entropy

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We consider a purely mechanical quantum cycle comprised of adiabatic and isoenergetic processes. In the latter, the system interacts with an energy bath keeping constant the expectation value of the Hamiltonian. In this work, we study the performance of the quantum cycle for a system described by the quantum Rabi model for the case of controlling the coupling strength parameter, the resonator frequency, and the two-level system frequency. For the cases of controlling either the coupling strength parameter or the resonator frequency, we find that it is possible to closely approach to maximal unit efficiency when the parameter is sufficiently increased in the first adiabatic stage. In addition, for the first two cases the maximal work extracted is obtained at parameter values corresponding to high efficiency, which constitutes an improvement over current proposals of this cycle.

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“…The light-matter interaction in the USC regime presents interesting properties, such as parity symmetry, and anharmonic energy spectrum [18]. These properties have led to remarkable applications of systems described by the USC, also termed quantum Rabi systems (QRS), such as fast quantum gates [19], efficient energy transfer [20,21], and genera- * Gabriel Alvarado gabriel.alvarado@usach.cl tion of non-classical states [22,23]. Further, current progress in superconducting circuit technology has enabled the manipulation of several parameters of QRSs [24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Isoenergetic Cycle for the Quantum Rabi Model

Barrios¹,

Peña²,

Albarrán-Arriagada³

et al. 2018

Preprint

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The isoenergetic cycle is a purely mechanical cycle comprised of adiabatic and isoenergetic processes. In the latter the system interacts with an energy bath keeping constant the expectation value of the Hamiltonian. This cycle has been mostly studied in systems consisting of particles confined in a power-law trap. In this work we study the performance of the isoenergetic cycle for a system described by the quantum Rabi model for the case of controlling the coupling strength parameter, the resonator frequency and the two-level system frequency. For the cases of controlling either the coupling strength parameter or the resonator frequency, we find that it is possible to closely approach to maximal unit efficiency when the parameter is sufficiently increased in the first adiabatic stage. In addition, for the first two cases the maximal work extracted is obtained at parameter values corresponding to high efficiency which constitutes an improvement over current proposals of this cycle.

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Incoherent-mediator for quantum state transfer in the ultrastrong coupling regime

Cited by 7 publications

References 59 publications

Charge qubits in the ultrastrong coupling regime

Charge qubits in the ultrastrong coupling regime

Quantum Mechanical Engine for the Quantum Rabi Model

Isoenergetic Cycle for the Quantum Rabi Model

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