Coherent Quantum Oscillations in a Silicon Charge Qubit
arXiv:1208.0519 · doi:10.1103/PhysRevB.88.075416
Abstract
Fast quantum oscillations of a charge qubit in a double quantum dot fabricated in a Si/SiGe heterostructure are demonstrated and characterized experimentally. The measured inhomogeneous dephasing time T2* ranges from 127ps to ~2.1ns; it depends substantially on how the energy difference of the two qubit states varies with external voltages, consistent with a decoherence process that is dominated by detuning noise(charge noise that changes the asymmetry of the qubit's double-well potential). In the regime with the shortest T2*, applying a charge-echo pulse sequence increases the measured inhomogeneous decoherence time from 127ps to 760ps, demonstrating that low-frequency noise processes are an important dephasing mechanism.
5 pages plus 3 page supplemental (8 pages total)
References in corpus (3)
Cited by in corpus (69)
- Quantum control and process tomography of a semiconductor quantum dot hybrid qubit
- Two-axis control of a singlet-triplet qubit with an integrated micromagnet
- Semiconductor Quantum Computation
- Review of performance metrics of spin qubits in gated semiconducting nanostructures
- Low-frequency charge noise in Si/SiGe quantum dots
- Microwave-driven coherent operations of a semiconductor quantum dot charge qubit
- Probing low noise at the MOS interface with a spin-orbit qubit
- Fast coherent manipulation of three-electron states in a double quantum dot
- Pauli Blockade in Silicon Quantum Dots with Spin-Orbit Control
- High fidelity resonant gating of a silicon based quantum dot hybrid qubit
- Tunable Hybrid Qubit in a GaAs Double Quantum Dot
- Extending the coherence of a quantum dot hybrid qubit
- Dephasing of Majorana-based qubits
- Gate-sensing coherent charge oscillations in a silicon field-effect transistor
- All-Microwave Control and Dispersive Readout of Gate-Defined Quantum Dot Qubits in Circuit Quantum Electrodynamics
- Surface code architecture for donors and dots in silicon with imprecise and nonuniform qubit couplings
- Achieving High-Fidelity Single-Qubit Gates in a Strongly Driven Charge Qubit with Charge Noise
- A decoherence-free subspace in a charge quadrupole qubit
- State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot
- A silicon singlet-triplet qubit driven by spin-valley coupling
- Detuning Axis Pulsed Spectroscopy of Valley-Orbital States in Si/SiGe Quantum Dots
- High-fidelity gates in quantum dot spin qubits
- Charge dynamics and spin blockade in a hybrid double quantum dot in silicon
- Parity-to-charge conversion for readout of topological Majorana qubits
- Interplay of charge noise and coupling to phonons in adiabatic electron transfer between quantum dots
- Long distance coupling of resonant exchange qubits
- Charge noise and overdrive errors in reflectometry-based charge, spin and Majorana qubit readout
- Measurements of capacitive coupling within a quadruple quantum dot array
- Two-Qubit Pulse Gate for the Three-Electron Double Quantum Dot Qubit
- Microwave spectroscopy of a carbon nanotube charge qubit
- Level spectrum and charge relaxation in a silicon double quantum dot probed by dual-gate reflectometry
- Enhancing the dipolar coupling of a - qubit with a transverse sweet spot
- Quantum entanglement driven by electron-vibrational mode coupling
- Read-out and Dynamics of the Qubit Built on Three Quantum Dots
- A tunable hybrid qubit in a triple quantum dot
- High-Fidelity Entangling Gates for Quantum-Dot Hybrid Qubits Based on Exchange Interactions
- High Fidelity Singlet-Triplet - Qubits in Inhomogeneous Magnetic Fields
- Ubiquitous non-local entanglement with Majorana bound states
- Simulation of 1/f charge noise affecting a quantum dot in a Si/SiGe structure
- Identifying single electron charge sensor events using wavelet edge detection
- Coherent Charge Oscillations in a Bilayer Graphene Double Quantum Dot
- Direct microwave spectroscopy of Andreev bound states in planar Ge Josephson junctions
- Correlations of spin splitting and orbital fluctuations due to 1/f charge noise in the Si/SiGe Quantum Dot
- Characterization of a gate-defined double quantum dot in a Si/SiGe nanomembrane
- Devitalizing noise-driven instability of entangling logic in silicon devices with bias controls
- Unifying Floquet theory of longitudinal and dispersive readout
- Suppression of leakage for a charge quadrupole qubit in triangular geometry
- Low-temperature environments for quantum computation and quantum simulation
- Swap Test with Quantum-Dot Charge Qubits
- Quantum Annealing Machine based on Floating Gate Array
- Tunable charge qubit based on barrier-controlled triple quantum dots
- Charge noise suppression in capacitively coupled singlet-triplet spin qubits under magnetic field
- Quantum Annealing Machines Based on Semiconductor Nanostructures
- Robust entangling gate for capacitively coupled few-electron singlet-triplet qubits
- Coherent coupling between a quantum dot and a donor in silicon
- Two-qubit logical operations in three quantum dots system
- Effect of interactions on quantum-limited detectors
- Microscopic theory on magnetic-field-tuned sweet spot of exchange interactions in multielectron quantum-dot systems
- Resonator-mediated quantum gate between distant charge qubits
- Theory of interaction-dependent instability in quantum detection by means of Luttinger liquid tunnel junction: a rigorous theorem
- Signatures of Valley Kondo Effect in Si/SiGe Quantum Dots
- Spin manipulation and spin dephasing in quantum dot integrated with a slanting magnetic field
- Transport spectroscopy of low disorder silicon tunnel barriers with and without Sb implants
- Sign-switching of superexchange mediated by few electrons under non-uniform magnetic field
- Entangling spin and charge degrees of freedom in semiconductor quantum dots
- Isotope engineering of silicon and diamond for quantum computing and sensing applications
- Spectral properties of a hybrid-qubit model based on a two-dimensional quantum dot
- Quantum entanglement response to pulsed gate modulation
- Landau-Zener Transitions in Spin Qubit Encoded in Three Quantum Dots