Quantum Dot Spin Cellular Automata for Realizing a Quantum Processor

Abstract

We show how "single" quantum dots, each hosting a singlet-triplet qubit, can be placed in arrays to build a spin quantum cellular automaton. A fast ($\sim 10$ ns) deterministic coherent singlet-triplet filtering, as opposed to current incoherent tunneling/slow-adiabatic based quantum gates (operation time $\sim 300$ ns), can be employed to produce a two-qubit gate through capacitive (electrostatic) coupling that can operate over significant distances. This is the coherent version of the widely discussed charge and nano-magnet cellular automata and would offer speed, reduce dissipation, perform quantum computation, while interfacing smoothly with its classical counterpart. This combines the best of two worlds -- the coherence of spin pairs known from quantum technologies, and the strength and range of electrostatic couplings from the charge based classical cellular automata.

16 pages, considerable changes to V1

References in corpus (9)

• Measurement-based quantum computation
• 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
• 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
• Conditional operation of a spin qubit
• Electric-dipole-induced spin resonance in a lateral double quantum dot incorporating two single domain nanomagnets
• Spin Filtering and Entanglement Swapping through Coherent Evolution of a Single Quantum Dot

Cited by in corpus (6)

• A decoherence-free subspace in a charge quadrupole qubit
• Arbitrary qubit transformations on tuneable Rashba rings
• Qubit transformations on Rashba ring with periodic potential
• Rashba controlled two-electron spin-charge qubits as building blocks of a quantum computer
• Controlling spin without magnetic fields -- the Bloch-Rashba rotator
• Diagnostics of many-particle electronic states from non-stationary currents and residual charge