Strong photon coupling to the quadrupole moment of an electron in a solid-state qubit

Koski, Jonne; Landig, Andreas; Russ, Maximilian; Abadillo-Uriel, J. C.; Scarlino, Pasquale; Kratochwil, Benedikt; Reichl, Christian; Wegscheider, Werner; Burkard, Guido; Friesen, Mark; Coppersmith, S. N.; Wallraff, Andreas; Ensslin, Klaus; Ihn, Thomas

doi:10.1038/s41567-020-0862-4

Cited by 32 publications

(43 citation statements)

References 23 publications

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“…However, the magnitude of tunneling noise is much weaker than that of the detuning noise. [ 46 ] Here, the error in the AC‐driven field ε AC is neglected, which is also much weaker than the detuning noise. [ 32 ] In addition, the fluctuation in the Overhauser field (nuclear noise) in GaAs can lead to unwanted error in

Δ B

and also introduce relaxation.…”

Section: Resultsmentioning

confidence: 99%

Universal Singlet‐Triplet Qubits Implemented Near the Transverse Sweet Spot

2021

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The key to realizing fault‐tolerant quantum computation for singlet‐triplet (ST) qubits in semiconductor double quantum dot (DQD) is to operate both the single‐ and two‐qubit gates with high fidelity. The feasible way includes operating the qubit near the transverse sweet spot (TSS) to reduce the leading order of the noise, as well as adopting the proper pulse sequences which are immune to noise. The single‐qubit gates can be achieved by introducing an AC drive on the detuning near the TSS. The large dipole moment of the DQDs at the TSS has enabled strong coupling between the qubits and the cavity resonator, which leads to two‐qubit entangling gates. When operating in the proper region and applying modest pulse sequences, both single‐ and two‐qubit gates have fidelity higher than 99%. The results in this paper suggest that taking advantage of the appropriate pulse sequences near the TSS can be effective to obtain high‐fidelity ST qubits.

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Δ B

and also introduce relaxation.…”

Section: Resultsmentioning

confidence: 99%

Universal Singlet‐Triplet Qubits Implemented Near the Transverse Sweet Spot

2021

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“…Thus, these results indicate that this hybrid system has the potential for investigating novel phenomena in multiple dots [26][27][28][29][30][31] and engineering various interacting many-body models. [1,33] Further, the tunability of this cavity coupled multi-dot system provides the opportunity for fundamental studies of matter-light interaction [36][37][38][39][40][41][42][43][44] and nonlinear process in quantum optics. [45][46][47]50] Appendix A: Theoretical Description with Input-Output Theory…”

Section: Discussionmentioning

confidence: 99%

“…Recently, many studies have demonstrated the dipole coupling between semiconductor QDs and cavity photons employing circuit quantum electrodynamics (cQED). [35][36][37][38][39][40][41][42] Such systems enable the study of matter-light interaction, [36][37][38][39][40][41][42][43][44] high-order effects, [45][46][47] and various fundamental physics in quantum optics. [46][47][48][49][50] Furthermore, the interaction between the cavity photon and QDs is exploited for characterization, which is harnessed to read out the charge distribution in multiple quantum dots as well as study valley splitting [51] and tunnel coupling.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Triple Quantum Dot via an On‐chip Microwave Resonator

Wang

Mingbo

et al. 2021

Adv Quantum Tech

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The hybrid circuit quantum electrodynamics architecture integrated quantum dots with a microwave resonator results in the creation of a controllable artificial system and enriches its physics through electron-photon interaction. In this study, a hybrid device is investigated, wherein a triple quantum dot (TQD) is dipole coupled with electric field of a superconducting quantum interference device array resonator. The quantum cellular automata (QCA) process of TQD, related to charge reconfiguration as a result of Coulomb interaction between each dot, is observed by probing reflectance of the resonator. The suppressed cavity reflectance signal of the QCA process may experimentally provide the evidence for the different measurement mechanism of the cavity from external electrometers like quantum point contact. Furthermore, on careful tuning of multiple energy level differences of the TQD to match the cavity photon frequency, four tunneling processes assisted by the absorption of the cavity photons occur simultaneously, contributing to "photon-assisted" quadruple point. Consequently, these two specific phenomena are found to be closely dependent on the relationship between the various Coulomb energy in TQD and the cavity photon energy. The results are consistent with the theoretical model presented and imply that this hybrid system has the potential for investigating exotic many-body effects and matter-light interaction.

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“…A triple‐dot charge qubit is usually conceived in a linear array . In this system, an electron resides in a triple‐quantum‐dot system, giving rise to three states.…”

Section: Introductionmentioning

confidence: 99%

“…In the lateral geometry, the tunneling between the two outermost dots is neglected, and one is left with only two barriers to address . It is argued that if the energies of the two barriers can be kept equal for the duration of the operation, and the same can be done for the energies of the two outmost dots, the qubit has a certain level of resistance against charge noise with which the fidelity may be improved . However, practically such a stringent requirement is difficult to satisfy, and even a slight deviation would cause considerable leakage of encoded information into non‐qubit state as the leaked state is energetically very close to the qubit states.…”

Section: Introductionmentioning

confidence: 99%

Suppression of Leakage for a Charge Qubit in Triangular Triple Quantum Dots

Xuan

Wang

2019

Adv Quantum Tech

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This paper presents a simple yet effective strategy to suppress the leakage in a three‐quantum‐dot charge qubit system by having the dots in a triangle as opposed to the linear geometry commonly conceived. It is found that the tunnel coupling between the two outmost dots is amplified in triangular triple dots, which consequently reduces leakage by separating the leaked state and qubit states. It has been found that the leakage can be suppressed by as much as five orders of magnitude when the dots form an equilateral triangle, with further improvement of control fidelities possible if composite pulses are applied.

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Strong photon coupling to the quadrupole moment of an electron in a solid-state qubit

Cited by 32 publications

References 23 publications

Universal Singlet‐Triplet Qubits Implemented Near the Transverse Sweet Spot

Universal Singlet‐Triplet Qubits Implemented Near the Transverse Sweet Spot

Characterization of a Triple Quantum Dot via an On‐chip Microwave Resonator

Suppression of Leakage for a Charge Qubit in Triangular Triple Quantum Dots

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