Coherent transfer of singlet-triplet qubit states in an architecture of triple quantum dots

Abstract

We propose two schemes to coherently transfer arbitrary quantum states of the two-electron singlet-triplet qubit across a chain of 3 quantum dots. The schemes are based on electrical control over the detuning energy of the quantum dots. The first is a pulse-gated scheme, requiring dc pulses and engineering of inter- and intra-dot Coulomb energies. The second scheme is based on the adiabatic theorem, requiring time-dependent control of the detuning energy through avoided crossings at a rate that the system remains in the ground state. We simulate the transfer fidelity using typical experimental parameters for silicon quantum dots. Our results give state transfer fidelities between $94.3\%<\mathcal{F}<99.5\%$ at sub-ns gate times for the pulse-gated scheme and between $75.4\%<\mathcal{F}<99.0\%$ at tens of ns for the adiabatic scheme. Taking into account dephasing from charge noise, we obtain state transfer fidelities between $94.0\%<\mathcal{F}<99.2\%$ for the pulse-gated scheme and between $64.9\%<\mathcal{F}<93.6\%$ for the adiabatic scheme.

Includes text and supplemental material, 11 Pages, 6 figures

References in corpus (21)

• Driven coherent oscillations of a single electron spin in a quantum dot
• Simple pulses for elimination of leakage in weakly nonlinear qubits
• Electrically driven single electron spin resonance in a slanting Zeeman field
• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Circuit Quantum Electrodynamics with a Spin Qubit
• Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Coherent electronic transfer in quantum dot systems using adiabatic passage
• Coherent spin manipulation in an exchange-only qubit
• Strong coupling of a spin qubit to a superconducting stripline cavity
• Quantum State Transfer via Noisy Photonic and Phononic Waveguides
• Coherent shuttle of electron-spin states
• Local Fault-tolerant Quantum Computation
• Direct control of the tunnel splitting in a one-electron double quantum dot
• Efficient multiqubit entanglement via a spin-bus
• Coherent long-distance displacement of individual electron spins
• Hubbard model description of silicon spin qubits: charge stability diagram and tunnel coupling in Si double quantum dots
• Orbital and valley state spectra of a few-electron silicon quantum dot
• Engineered valley-orbit splittings in quantum confined nanostructures in silicon
• Fast tunnel rates in Si/SiGe one-electron single and double quantum dots
• A simple approach to the Landau-Zener formula

Cited by in corpus (6)

• Spin shuttling in a silicon double quantum dot
• Spin entangled state transfer in quantum dot arrays: Coherent adiabatic and speed-up protocols
• Coherent long-range transfer of two-electron states in ac-driven triple quantum dots
• High-fidelity quantum control via Autler-Townes splitting
• Resonator-mediated quantum gate between distant charge qubits
• Two-qubit sweet spots for capacitively coupled exchange-only spin qubits