A tunable hybrid qubit in a triple quantum dot

Abstract

We experimentally demonstrate quantum coherent dynamics of a triple-dot-based multi-electron hybrid qubit. Pulsed experiments show that this system can be conveniently initialized, controlled, and measured electrically, and has good coherence time as compared to gate time. Furthermore, the current multi-electron hybrid qubit has an operation frequency that is tunable in a wide range, from 2 to about 15 GHz. We provide qualitative understandings of the experimental observations by mapping it onto a three-electron system, and compare it with the double dot hybrid qubit and the all-exchange triple-dot qubit.

16 pages, 4 figures

References in corpus (8)

• Driven coherent oscillations of a single electron spin in a quantum dot
• Coherent control of a single electron spin with electric fields
• An addressable quantum dot qubit with fault-tolerant control fidelity
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Coherent spin manipulation in an exchange-only qubit
• Microwave-driven coherent operations of a semiconductor quantum dot charge qubit
• Three-electron spin qubits
• Suppression of charge noise using barrier control of a singlet-triplet qubit

Cited by in corpus (12)

• Semiconductor Quantum Computation
• A quadrupolar exchange-only spin qubit
• Realization of a $C{Q}_3$ Qubit: energy spectroscopy and coherence
• Molecular formations and spectra due to electron correlations in three-electron hybrid double-well qubits
• Wigner molecules and hybrid qubits
• Suppression of leakage for a charge quadrupole qubit in triangular geometry
• Coherence time analysis in semiconducting hybrid qubit under realistic experimental conditions
• Phonon-induced decoherence of a charge quadrupole qubit
• Efficient Two-Qubit Pulse Sequences Beyond CNOT
• Tunable charge qubit based on barrier-controlled triple quantum dots
• Exact Entanglement dynamics in Three Interacting Qubits
• Microwave spectroscopy of spin-orbit coupled states: energy detuning versus interdot coupling modulation