Charge noise suppression in capacitively coupled singlet-triplet spin qubits under magnetic field

Abstract

Charge noise is the main hurdle preventing high-fidelity operation, in particular that of two-qubit gates, of semiconductor-quantum-dot-based spin qubits. While certain sweet spots where charge noise is substantially suppressed have been demonstrated in several types of spin qubits, the existence of one for coupled singlet-triplet qubits is unclear. We theoretically demonstrate, using full configuration-interaction calculations, that a range of nearly sweet spots appear in the coupled singlet-triplet qubit system when a strong enough magnetic field is applied externally. We further demonstrate that ramping to and from the judiciously chosen nearly sweet spot using sequences based on the shortcut to adiabaticity offers maximal gate fidelities under charge noise and phonon-induced decoherence. These results should facilitate realization of high-fidelity two-qubit gates in singlet-triplet qubit systems.

arXiv comment5+28 pages, 4+19 figures

References in corpus (66)

• Coherent manipulation of electronic states in a double quantum dot
• A simple formula for the average gate fidelity of a quantum dynamical operation
• Fast optimal frictionless atom cooling in harmonic traps
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Universal quantum computation with spin-1/2 pairs and Heisenberg exchange
• Charge-qubit operation of an isolated double quantum dot
• Quantum Coherence in a One-Electron Semiconductor Charge Qubit
• Lewis-Riesenfeld invariants and transitionless tracking algorithm
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Dispersive regime of circuit QED: photon-dependent qubit dephasing and relaxation rates
• Reduced sensitivity to charge noise in semiconductor spin qubits via symmetric operation
• Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath
• Controllable valley splitting in silicon quantum devices
• Noise suppression using symmetric exchange gates in spin qubits
• The Resonant Exchange Qubit
• A fault-tolerant addressable spin qubit in a natural silicon quantum dot
• Two-axis control of a singlet-triplet qubit with an integrated micromagnet
• Microwave-driven coherent operations of a semiconductor quantum dot charge qubit
• Valley Polarization in Si(100) at Zero Magnetic Field
• Interlaced Dynamical Decoupling and Coherent Operation of a Singlet-Triplet Qubit
• A Reconfigurable Gate Architecture for Si/SiGe Quantum Dots
• Probing low noise at the MOS interface with a spin-orbit qubit
• Coherent Quantum Oscillations in a Silicon Charge Qubit
• Electrically-protected resonant exchange qubits in triple quantum dots
• Fast coherent manipulation of three-electron states in a double quantum dot
• Three-electron spin qubits
• Integrated silicon qubit platform with single-spin addressability, exchange control and robust single-shot singlet-triplet readout
• Background charge fluctuation in a GaAs quantum dot device
• Tunable Hybrid Qubit in a GaAs Double Quantum Dot
• Quantum dot spin qubits in Silicon: Multivalley physics
• Resonantly driven singlet-triplet spin qubit in silicon
• Closed-loop control of a GaAs-based singlet-triplet spin qubit with 99.5% gate fidelity and low leakage
• Tunable singlet-triplet splitting in a few-electron Si/SiGe quantum dot
• Nonadiabatic quantum control of a semiconductor charge qubit
• Quantum gates between capacitively coupled double quantum dot two-spin qubits
• GaAs Quantum Dot Thermometry Using Direct Transport and Charge Sensing
• Screening of charged impurities with multi-electron singlet-triplet spin qubits in quantum dots
• Orbital and valley state spectra of a few-electron silicon quantum dot
• Exchange-based CNOT gates for singlet-triplet qubits with spin orbit interaction
• Phonon-Mediated Decay of Singlet-Triplet Qubits in Double Quantum Dots
• Exchange-based two-qubit gate for singlet-triplet qubits
• Implications of Simultaneous Requirements for Low Noise Exchange Gates in Double Quantum Dots
• Controllable exchange coupling between two singlet-triplet qubits
• Symmetric Operation of the Resonant Exchange Qubit
• Two-Qubit Couplings of Singlet-Triplet Qubits Mediated by One Quantum State
• Silver-Epoxy Microwave Filters and Thermalizers for Millikelvin Experiments
• High-fidelity gates in quantum dot spin qubits
• Crosstalk error correction through dynamical decoupling of single-qubit gates in capacitively coupled singlet-triplet semiconductor spin qubits
• Electrically controlled quantum gates for two-spin qubits in two double quantum dots
• High-fidelity gate set for exchange-coupled singlet-triplet qubits
• A fast quantum interface between different spin qubit encodings
• Configuration interaction calculations of the controlled phase gate in double quantum dot qubits
• Directly accessible entangling gates for capacitively coupled singlet-triplet qubits
• Capacitively coupled singlet-triplet qubits in the double charge resonant regime
• Enhancing the dipolar coupling of a $S$-$T_0$ qubit with a transverse sweet spot
• Fabrication and characterization of an undoped GaAs/AlGaAs quantum dot device
• Theory of barrier vs tilt exchange gate operations in spin-based quantum computing
• Effect of quantum Hall edge strips on valley splitting in silicon quantum wells
• Suppression of charge noise using barrier control of a singlet-triplet qubit
• Low-noise conditional operation of singlet-triplet coupled quantum dot qubits
• Error correction for gate operations in systems of exchange-coupled singlet-triplet qubits in double quantum dots
• High-fidelity two-qubit gates in silicon above one Kelvin
• Capacitative coupling of singlet-triplet qubits in different inter-qubit geometries
• Simulation of Coupling Strength of Capacitively Coupled Singlet-Triplet Qubits
• Magic angle for barrier-controlled double quantum dots
• A robust operating point for capacitively coupled singlet-triplet qubits

Cited by in corpus (4)

• Limits to Quantum Gate Fidelity from Near-Field Thermal and Vacuum Fluctuations
• Robust entangling gate for capacitively coupled few-electron singlet-triplet qubits
• Theory on electron-phonon spin dehphasing in GaAs multi-electron double quantum dots
• Limitations on the maximal level of entanglement of two singlet-triplet qubits in GaAs quantum dots