Stabilizing Rabi oscillation of a charge qubit via the atomic clock technique

Yu, Deshui; Landra, Alessandro; Kwek, Leong Chuan; Amico, Luigi; Dumke, Rainer

doi:10.1088/1367-2630/aaa643

Cited by 14 publications

(14 citation statements)

References 55 publications

(101 reference statements)

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“…where ρ is the density operator of the system and we have defined the energy-relaxation and dephasing rates γ − = 2π × 0.06 GHz and γ ϕ = 2π × 0.13 GHz of the charge qubit [4] and the Lindblad superoperator…”

Section: And Have Energy Gaps Of Hmentioning

confidence: 99%

“…However, current practical execution is significantly limited by their short energy-relaxation and dephasing times (tens of microseconds [2]). Feedback control may persist the Rabi oscillation of superconducting qubits infinitely [3] and efficiently suppresses the low-frequency 1/f fluctuation in circuits [4,5]. In addition, hybrid schemes composed of superconducting circuits and neutral atoms potentially implement the quantum-state transfer between a rapid quantum processor and long-term memory [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear circuit quantum electrodynamics based on the charge-qubit–resonator interface

Kwek

Amico

et al. 2018

Phys. Rev. A

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We theoretically explore the applications of a nonlinear circuit QED system, where a charge qubit is inductively coupled to an LC resonator, in the photonic engineering and ultrastrong-coupling multiphoton quantum optics. An arbitrary Fock-state pulsed maser, where the artificial qubit plays the gain-medium role, is achieved via simply sweeping the gate-voltage bias. The resonantly pumped parametric qubit-resonator interface leads to a squeezed intraresonator field, which is utilizable for the quantum-limited microwave amplification. Moreover, upwards and downwards multiphoton quantum jumps may be observed in the driving-free steady-state system.

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Section: And Have Energy Gaps Of Hmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear circuit quantum electrodynamics based on the charge-qubit–resonator interface

Kwek

Amico

et al. 2018

Phys. Rev. A

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“…When the qubit working point departs from N g 1 2 = , the 1/f noise significantly reduces T 2 [14][15][16]. Nevertheless, the influence of the 1/f noise may be weakened via stabilizing the superconducting qubit to a high-Q resonator [41] and the feedback control method [42,43], which potentially extends the dephasing time T 2 .…”

Section: Dissipative Systemmentioning

confidence: 99%

Relaxation of Rabi dynamics in a superconducting multiple-qubit circuit

Kwek

Dumke

2018

J. Phys. Commun.

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We investigate a superconducting circuit consisting of multiple capacitively-coupled charge qubits. The collective Rabi oscillation of qubits is numerically studied in detail by imitating environmental fluctuations according to the experimental measurement. For the quantum circuit composed of identical qubits, the energy relaxation of the system strongly depends on the interqubit coupling strength. As the qubit-qubit interaction is increased, the system's relaxation rate is enhanced first and then significantly reduced. In contrast, the inevitable inhomogeneity caused by the nonideal fabrication always accelerates the collective energy relaxation of the system and weakens the interqubit correlation. However, such an inhomogeneous quantum circuit is an interesting test bed for studying the effect of the system inhomogeneity in quantum many-body simulation. IntroductionOwing to the fascinating properties such as flexibility, tunability, scalability, and strong interaction with electromagnetic fields, superconducting Josephson-junction circuits provide an outstanding platform for quantum information processing (QIP) [1, 2], quantum simulation of many-body physics [3][4][5], and exploring the fundamentals of quantum electrodynamics in and beyond the ultrastrong-coupling regime [6,7]. Additionally, hybridizing these solid-state devices with the atoms may enable the information transfer between macroscopic and microscopic quantum systems [8][9][10][11][12][13], where the superconducting circuits play the role of rapid processor while the atoms act as the long-term memory. Nonetheless, the strong coupling to the environmental noise significantly limits the energy-relaxation (T 1 ) and dephasing (T 2 ) times of superconducting circuits [14][15][16].Recently, there has been focus on large-scale QIP [17,18]. Several network schemes have already been demonstrated in experiments: one-dimensional spin chain with the nearest-neighbor interaction [19,20], twodimensional lattice with quantum-bus-linked qubits [21,22], multiple artificial atoms interacting with the same resonator [17], and many cavities coupled to a superconducting qubit [23]. However, only little attention has been paid to the quantum circuit composed of nearly identical superconducting qubits, where an arbitrary individual directly interacts with others and, in addition, all qubits are biased by the same voltage, current, or magnetic bias and are exposed to the same fluctuation source. Studying such a multiple-qubit architecture is of importance to superconducting QIP network. For one thing, the nearest-or next-nearest-neighbour-coupling approximation, which is commonly employed in scalable superconducting schemes [24][25][26], does not always hold the truth in realistic systems. For another, transferring the quantum information from one processor to another over a long distance, which relies on the long-range interqubit coupling, is essential for cluster quantum computing [27] and quantum algorithms [28]. Moreover, in a large-scale network composed of strong o...

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“…Here, we formulate and study a Rabi-type minimal model describing qubit-qudit interaction mediated by a single mode quantum bosonic field. This type of models has emerged recently in several studies of specific systems where atoms, solid state devices (such as superconducting and quantum dot qubits) are assembled together to form hybrid quantum networks [6,[13][14][15][16][17][18][19][20]. In this context, entangling quantum systems of heterogeneous nature is sought intensively [21][22][23], as such hybrid entangled states could become useful in converting quantum information between different encodings [24].…”

Section: Introductionmentioning

confidence: 99%

GHZ-like states in the Qubit-Qudit Rabi model

et al. 2021

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We study a Rabi type Hamiltonian system in which a qubit and a dd-level quantum system (qudit) are coupled through a common resonator. In the weak and strong coupling limits the spectrum is analysed through suitable perturbative schemes. The analysis show that the presence of the multilevels of the qudit effectively enhance the qubit-qudit interaction. The ground state of the strongly coupled system is found to be of Greenberger-Horne-Zeilinger (GHZ) type. Therefore, despite the qubit-qudit strong coupling, the nature of the specific tripartite entanglement of the GHZ state suppresses the bipartite entanglement. We analyze the system dynamics under quenching and adiabatic switching of the qubit-resonator and qudit-resonator couplings. In the quench case, we found that the non-adiabatic generation of photons in the resonator is enhanced by the number of levels in the qudit. The adiabatic control represents a possible route for preparation of GHZ states. Our analysis provides relevant information for future studies on coherent state transfer in qubit-qudit systems.

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Stabilizing Rabi oscillation of a charge qubit via the atomic clock technique

Cited by 14 publications

References 55 publications

Nonlinear circuit quantum electrodynamics based on the charge-qubit–resonator interface

Nonlinear circuit quantum electrodynamics based on the charge-qubit–resonator interface

Relaxation of Rabi dynamics in a superconducting multiple-qubit circuit

GHZ-like states in the Qubit-Qudit Rabi model

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