Performance Assessment of Resonantly Driven Silicon Two-Qubit Quantum Gate
arXiv:1808.08659 · doi:10.1109/LED.2018.2835385
Abstract
Two-qubit quantum gates play an essential role in quantum computing, whose operation critically depends on the entanglement between two qubits. Resonantly driven controlled-NOT (CNOT) gates based on silicon double quantum dots (DQDs) are studied theoretically. The physical mechanisms for effective gate modulation of the exchange coupling between two qubits are elucidated. Scaling behaviors of the singlet-triplet energy split, gate-switching speed, and gate fidelity are investigated as a function of the quantum dot spacing and modulation gate voltage. It is shown that the entanglement strength and gate-switching speed exponentially depend on the quantum dot spacing. A small spacing of ~10nm can promise a CNOT gate delay of <1 ns and reliable gate switching in the presence of decoherence. The results show promising performance potential of the resonantly driven two-qubit quantum gates based on aggressively scaled silicon DQDs.
arXiv comment4 pages, 4 figures, published on IEEE EDL(please cite journal version)
References in corpus (18)
- Quantum Computation with Quantum Dots
- Hardware-efficient Variational Quantum Eigensolver for Small Molecules and Quantum Magnets
- Coherent control of a single electron spin with electric fields
- A Two Qubit Logic Gate in Silicon
- A programmable two-qubit quantum processor in silicon
- A CMOS silicon spin qubit
- Roads towards fault-tolerant universal quantum computation
- Quantum CNOT Gate for Spins in Silicon
- Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
- Quantum process tomography of a controlled-NOT gate
- Few-Electron Quantum Dot Circuit with Integrated Charge Read-Out
- Reduced sensitivity to charge noise in semiconductor spin qubits via symmetric operation
- Valley Splitting Theory of SiGe/Si/SiGe Quantum Wells
- High-fidelity quantum gates in Si/SiGe double quantum dots
- Physical Optimization of Quantum Error Correction Circuits
- Efficient C-Phase gate for single-spin qubits in quantum dots
- Exchange coupling in silicon quantum dots: Theoretical considerations for quantum computation
- Failure of standard approximations of the exchange coupling in nanostructures