Quantum Gates Between Two Spins in a Triple Dot System with an Empty Dot
arXiv:1104.0716 · doi:10.1103/PhysRevB.88.035304
Abstract
We propose a scheme for implementing quantum gates and entanglement between spin qubits in the outer dots of a triple-dot system with an empty central dot. The voltage applied to the central dot can be tuned to realize the gate. Our scheme exemplifies the possibility of quantum gates outside the regime where each dot has an electron, so that spin-spin exchange interaction is not the only relevant mechanism. Analytic treatment is possible by mapping the problem to a t-J model. The fidelity of the entangling quantum gate between the spins is analyzed in the presence of decoherence stemming from a bath of nuclear spins, as well as from charge fluctuations. Our scheme provides an avenue for extending the scope of two qubit gate experiments to triple-dots, while requiring minimal control, namely that of the potential of a single dot, and may enhance the qubit separation to ease differential addressability.
7 pages, 6 figures
References in corpus (14)
- Time-resolved Observation and Control of Superexchange Interactions with Ultracold Atoms in Optical Lattices
- Spin qubits with electrically gated polyoxometalate molecules
- Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
- Coherent spin manipulation in an exchange-only qubit
- An electrostatically defined serial triple quantum dot charged with few electrons
- Universal set of quantum gates for double-dot spin qubits with fixed interdot coupling
- Quantum simulation of Fermi-Hubbard models in semiconductor quantum dot arrays
- Controlling Spin Qubits in Quantum Dots
- Compact silicon double and triple dots realized with only two gates
- A Scalable Architecture for Coherence-Preserving Qubits
- Singlet-triplet filtering and entanglement in a quantum dot structure
- Spin-Photon Entangling Diode
- Spin Filtering and Entanglement Swapping through Coherent Evolution of a Single Quantum Dot
- A proposed spin qubit CNOT gate robust against noisy coupling