Two-Qubit Couplings of Singlet-Triplet Qubits Mediated by One Quantum State
arXiv:1403.2910 · doi:10.1103/PhysRevB.90.045404
Abstract
We describe high-fidelity entangling gates between singlet-triplet qubits (STQs) which are coupled via one quantum state (QS). The QS can be provided by a quantum dot itself or by another confined system. The orbital energies of the QS are tunable using an electric gate close to the QS, which changes the interactions between the STQs independent of their single-qubit parameters. Short gating sequences exist for the controlled NOT (CNOT) operations. We show that realistic quantum dot setups permit excellent entangling operations with gate infidelities below , which is lower than the quantum error correction threshold of the surface code. We consider limitations from fabrication errors, hyperfine interactions, spin-orbit interactions, and charge noise in GaAs and Si heterostructures.
12 pages, 6 figures
References in corpus (11)
- Surface codes: Towards practical large-scale quantum computation
- Coherent control of a single electron spin with electric fields
- Electrically driven single electron spin resonance in a slanting Zeeman field
- Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
- Universal quantum control of two-electron spin quantum bits using dynamic nuclear polarization
- Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
- Enhancing the Coherence of a Spin Qubit by Operating it as a Feedback Loop That Controls its Nuclear Spin Bath
- Ultrafast optical control of entanglement between two quantum dot spins
- Singlet-triplet decoherence due to nuclear spins in a double quantum dot
- Universal set of quantum gates for double-dot spin qubits with fixed interdot coupling
- Noise-resistant control for a spin qubit array
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- Energy spectrum, exchange interaction and gate crosstalk in a pair of double-quantum-dot system: a molecular orbital calculation
- Electron spin-flip correlations due to nuclear dynamics in driven GaAs double dots
- Two-qubit logical operations in three quantum dots system
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