Long-distance spin-spin coupling via floating gates

Abstract

The electron spin is a natural two level system that allows a qubit to be encoded. When localized in a gate defined quantum dot, the electron spin provides a promising platform for a future functional quantum computer. The essential ingredient of any quantum computer is entanglement---between electron spin qubits---commonly achieved via the exchange interaction. Nevertheless, there is an immense challenge as to how to scale the system up to include many qubits. Here we propose a novel architecture of a large scale quantum computer based on a realization of long-distance quantum gates between electron spins localized in quantum dots. The crucial ingredients of such a long-distance coupling are floating metallic gates that mediate electrostatic coupling over large distances. We show, both analytically and numerically, that distant electron spins in an array of quantum dots can be coupled selectively, with coupling strengths that are larger than the electron spin decay and with switching times on the order of nanoseconds.

11 pages, 8 figures

References in corpus (15)

• Driven coherent oscillations of a single electron spin in a quantum dot
• Coherent control of a single electron spin with electric fields
• Fault-tolerant quantum computation with high threshold in two dimensions
• Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes
• Quantum computing with nearest neighbor interactions and error rates over 1%
• Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
• Spin-Electric Coupling in Molecular Magnets
• Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission line
• Spin-Orbit Mediated Control of Spin Qubits
• Spin-orbit interaction and anomalous spin relaxation in carbon nanotube quantum dots
• Bends In Nanotubes Allow Electric Spin Control and Coupling
• Quantum gates between capacitively coupled double quantum dot two-spin qubits
• Spin-spin coupling in electrostatically coupled quantum dots
• Lower bounds on the complexity of simulating quantum gates
• Spin Relaxation in a Quantum Dot due to Nyquist Noise

Cited by in corpus (71)

• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Silicon CMOS architecture for a spin-based quantum computer
• Tunable Coupling Architecture for Fixed-frequency Transmons
• Direct Rashba spin-orbit interaction in Si and Ge nanowires with different growth directions
• Circuit QED with Hole-Spin Qubits in Ge/Si Nanowire Quantum Dots
• Fault-Tolerance of "Bad" Quantum Low-Density Parity Check Codes
• Universal Quantum Computation with Hybrid Spin-Majorana Qubits
• Long-Range Interaction of Spin-Qubits via Ferromagnets
• RKKY interaction in carbon nanotubes and graphene nanoribbons
• Strong spin-orbit interaction and $g$-factor renormalization of hole spins in Ge/Si nanowire quantum dots
• Perspective: non-Hermitian physics in magnetic systems
• Blueprint of a scalable spin qubit shuttle device for coherent mid-range qubit transfer in disordered Si/SiGe/SiO${}_2$
• Single-shot realization of nonadiabatic holonomic quantum gates in decoherence-free subspaces
• Spin-orbit Interactions for Singlet-Triplet Qubits in Silicon
• Bell-state generation for spin qubits via dissipative coupling
• Entangling distant resonant exchange qubits via circuit quantum electrodynamics
• Coupling spin qubits via superconductors
• Exchange-based CNOT gates for singlet-triplet qubits with spin orbit interaction
• Tunable Spin Qubit Coupling Mediated by a Multi-Electron Quantum Dot
• Tuning methods for semiconductor spin--qubits
• Exchange-based two-qubit gate for singlet-triplet qubits
• Controllable exchange coupling between two singlet-triplet qubits
• Negative spin exchange in a multielectron quantum dot
• Control Electronics For Semiconductor Spin Qubits
• Entangling Distant Spin qubits via a Magnetic Domain Wall
• Quantum memories and error correction
• Long-Distance Entanglement of Spin Qubits via Quantum Hall Edge States
• Blueprint for quantum computing using electrons on helium
• Entangling Spins in Double Quantum Dots and Majorana Bound States
• Long-range entanglement for spin qubits via quantum Hall edge modes
• Radio-frequency methods for Majorana-based quantum devices: fast charge sensing and phase diagram mapping
• Single-spin manipulation in a double quantum dot in the field of a micromagnet
• Exchange-interaction of two spin qubits mediated by a superconductor
• Remote capacitive sensing in two-dimension quantum-dot arrays
• Strategies for enhancing spin-shuttling fidelities in Si/SiGe quantum wells with random-alloy disorder
• Focusing RKKY interaction by graphene P-N junction
• Fault-Tolerant Quantum Computation for Singlet-Triplet Qubits with Leakage Errors
• High-fidelity spin qubit shuttling via large spin-orbit interaction
• Capacitively coupled singlet-triplet qubits in the double charge resonant regime
• Long-Range Interaction between Charge and Spin Qubits in Quantum Dots
• Device Architecture for Coupling Spin Qubits Via an Intermediate Quantum State
• Exchange interaction of hole-spin qubits in double quantum dots in highly anisotropic semiconductors
• Exact CNOT Gates with a Single Nonlocal Rotation for Quantum-Dot Qubits
• All electrically controlled quantum gates for single heavy hole spin qubits
• Programmable two-qubit gates in capacitively coupled flopping-mode spin qubits
• Dissipative Long-Range Entanglement Generation between Electronic Spins
• Enhancing qubit readout through dissipative sub-Poissonian dynamics
• Intrinsic Metastabilities in the Charge Configuration of a Double Quantum Dot
• Simple operation sequences to couple and interchange quantum information between spin qubits of different kinds
• Generation of Schrödinger's cat states in a planar semiconductor heterostructure
• Long-range exchange interaction between spin qubits mediated by a superconducting link at finite magnetic field
• Asymmetric $g$ tensor in low-symmetry two-dimensional hole systems
• Fast high-fidelity single-qubit gates for flip-flop qubits in silicon
• Self assembled Wigner crystals as mediators of spin currents and quantum information
• Tunable charge qubit based on barrier-controlled triple quantum dots
• Magic angle for barrier-controlled double quantum dots
• Selective generation and amplification of RKKY interactions by P-N interface
• Surface Entanglement in Quantum Spin Networks
• Energy spectrum, exchange interaction and gate crosstalk in a pair of double-quantum-dot system: a molecular orbital calculation
• Topological Spin Textures Enabling Quantum Transmission
• Entangling color centers via magnon-antimagnon pair creation
• Mesoscopic Spin Systems as Quantum Entanglers
• Flying-cat parity checks for quantum error correction
• Entangling spin and charge degrees of freedom in semiconductor quantum dots
• Dressed basis sets for the modeling of exchange interactions in double quantum dots
• Breaking conservation law enables steady-state entanglement out of equilibrium
• Entanglement between distant atoms mediated by a hybrid quantum system consisting of superconducting flux qubit and resonators
• Long range magnetic dipole-dipole interaction mediated by a superconductor
• All-electric single electron spin-to-charge conversion
• Spatiotemporal Spread of Fermi-edge Singularity as Time Delayed Interaction and Impact on Time-dependent RKKY Type Coupling
• Long-distance coupling of spin qubits via topological magnons