Protecting solid-state spins from strongly coupled environment

Abstract

Quantum memories are critical for solid-state quantum computing devices and a good quantum memory requires both long storage time and fast read/write operations. A promising system is the Nitrogen-Vacancy (NV) center in diamond, where the NV electronic spin serves as the computing qubit and a nearby nuclear spin as the memory qubit. Previous works used remote, weakly coupled ${}^{13}$C nuclear spins, trading read/write speed for long storage time. Here we focus instead on the intrinsic strongly coupled ${}^{14}$N nuclear spin. We first quantitatively understand its decoherence mechanism, identifying as its source the electronic spin that acts as a quantum fluctuator. We then propose a scheme to protect the quantum memory from the fluctuating noise by applying dynamical decoupling on the environment itself. We demonstrate a factor of $3$ enhancement of the storage time in a proof-of-principle experiment, showing the potential for a quantum memory that combines fast operation with long coherence time.

21 pages, 10 figures

References in corpus (13)

• Quantum sensing
• Probing many-body dynamics on a 51-atom quantum simulator
• Universal dynamical decoupling of a single solid-state spin from a spin bath
• High-fidelity projective readout of a solid-state spin quantum register
• Dynamic polarization of single nuclear spins by optical pumping of NV color centers in diamond at room temperature
• Robust dynamical decoupling for quantum computing and quantum memory
• Dynamically Error-Corrected Gates for Universal Quantum Computation
• Fault-tolerant quantum error detection
• Coherence and control of quantum registers based on electronic spin in a nuclear spin bath
• Direct identification of dilute surface spins on Al${}_2$O${}_3$: Origin of flux noise in quantum circuits
• Coherence of an optically illuminated single nuclear spin qubit
• Room-temperature high-speed nuclear-spin quantum memory in diamond
• Room-temperature storage of quantum entanglement using decoherence-free subspace in a solid-state spin system

Cited by in corpus (9)

• Phonon engineering of atomic-scale defects in superconducting quantum circuits
• Coherence protection and decay mechanism in qubit ensembles under concatenated continuous driving
• Cross-sensor feedback stabilization of an emulated quantum spin gyroscope
• Observation of high-order Mollow triplet by quantum mode control with concatenated continuous driving
• Efficient quantum error correction of dephasing induced by a common fluctuator
• Characterizing temperature and strain variations with qubit ensembles for their robust coherence protection
• Precise high-fidelity electron-nuclear spin entangling gates in NV centers via hybrid dynamical decoupling sequences
• Self-consistent noise characterization of quantum devices
• Dephasing superchannels