Coherent spin-exchange via a quantum mediator

Abstract

Coherent interactions at a distance provide a powerful tool for quantum simulation and computation. The most common approach to realize an effective long-distance coupling 'on-chip' is to use a quantum mediator, as has been demonstrated for superconducting qubits and trapped ions. For quantum dot arrays, which combine a high degree of tunability with extremely long coherence times, the experimental demonstration of coherent spin-spin coupling via an intermediary system remains an important outstanding goal. Here, we use a linear triple-quantum-dot array to demonstrate a first working example of a coherent interaction between two distant spins via a quantum mediator. The two outer dots are occupied with a single electron spin each and the spins experience a superexchange interaction through the empty middle dot which acts as mediator. Using single-shot spin read-out we measure the coherent time evolution of the spin states on the outer dots and observe a characteristic dependence of the exchange frequency as a function of the detuning between the middle and outer dots. This approach may provide a new route for scaling up spin qubit circuits using quantum dots and aid in the simulation of materials and molecules with non-nearest neighbour couplings such as MnO, high-temperature superconductors and DNA. The same superexchange concept can also be applied in cold atom experiments.

12 pages (3 figures), 11 pages of supplementary material; minor changes, added references. arXiv admin note: text overlap with arXiv:1507.07991

References in corpus (12)

• Single-shot read-out of an individual electron spin in a quantum dot
• Coupling Superconducting Qubits via a Cavity Bus
• Spin qubits in graphene quantum dots
• Coherent quantum state storage and transfer between two phase qubits via a resonant cavity
• Circuit Quantum Electrodynamics with a Spin Qubit
• Spin qubits with electrically gated polyoxometalate molecules
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Strong coupling of a spin qubit to a superconducting stripline cavity
• Ultra-long distance interaction between spin qubits
• Efficient multiqubit entanglement via a spin-bus
• Spectral properties near the Mott transition in the two-dimensional Hubbard model with next-nearest-neighbor hopping
• Cavity quantum electrodynamics with semiconductor double-dot molecules on a chip

Cited by in corpus (50)

• Semiconductor Spin Qubits
• Interfacing spin qubits in quantum dots and donors - hot, dense and coherent
• A Coherent Spin-Photon Interface in Silicon
• Semiconductor Quantum Computation
• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Coherent shuttle of electron-spin states
• Coherent spin state transfer via Heisenberg exchange
• A shuttling-based two-qubit logic gate for linking distant silicon quantum processors
• Donor spins in silicon for quantum technologies
• Revealing non-classicality of inaccessible objects
• Coherent long-distance displacement of individual electron spins
• Microwave photon-mediated interactions between semiconductor qubits
• Distant spin entanglement via fast and coherent electron shuttling
• Coupling a single electron spin to a microwave resonator: Controlling transverse and longitudinal couplings
• Adiabatic quantum state transfer in a semiconductor quantum-dot spin chain
• A logical qubit in a linear array of semiconductor quantum dots
• Fast spin exchange between two distant quantum dots
• Two-qubit logic between distant spins in silicon
• Exchange coupling in a linear chain of three quantum-dot spin qubits in silicon
• Qubit gates with simultaneous transport in double quantum dots
• Long-Distance Superexchange between Semiconductor Quantum-Dot Electron Spins
• Coherent multi-spin exchange coupling in a quantum-dot spin chain
• Spin of a multielectron quantum dot and its interaction with a neighboring electron
• Entangling Spins in Double Quantum Dots and Majorana Bound States
• Acoustic Traps and Lattices for Electrons in Semiconductors
• Coherent transport in a linear triple quantum dot made from a pure-phase InAs nanowire
• Spin decoherence in a two-qubit CPHASE gate: the critical role of tunneling noise
• Impact of valley phase and splitting on readout of silicon spin qubits
• Coherent transport of spin by adiabatic passage in quantum dot arrays
• Device Architecture for Coupling Spin Qubits Via an Intermediate Quantum State
• Negative exchange interactions in coupled few-electron quantum dots
• A Silicon Surface Code Architecture Resilient Against Leakage Errors
• Interplay of exchange and superexchange in triple quantum dots
• Low-Error Operation of Spin Qubits with Superexchange Coupling
• Detecting non-decomposability of time evolution via extreme gain of correlations
• Effective spin-spin interactions in bilayers of Rydberg atoms and polar molecules
• Variational quantum state preparation via quantum data buses
• Non-linear and dot-dependent Zeeman splitting in GaAs/AlGaAs quantum dot arrays
• Towards a realistic GaAs-spin qubit device for a classical error-corrected quantum memory
• Long-range exchange interaction between spin qubits mediated by a superconducting link at finite magnetic field
• Extracting inter-dot tunnel couplings between few donor quantum dots in silicon
• A flux-controlled two-site Kitaev chain
• Topological Spin Textures Enabling Quantum Transmission
• Universal control of superexchange in linear triple quantum dots with an empty mediator
• Noise suppression and long-range exchange coupling for gallium arsenide spin qubits
• Sign-switching of superexchange mediated by few electrons under non-uniform magnetic field
• Measurement enhances long-distance Entanglement generation in spin chains with dissipative processes
• Long-range Entanglement of Kondo Clouds in Open Triple Quantum Dots
• Distributing entanglement with separable states: assessment of encoding and decoding imperfections
• Barenco gate implementation using driven two- and three-qubit spin chains