Room-temperature high-speed nuclear-spin quantum memory in diamond

Abstract

Quantum memories provide intermediate storage of quantum information until it is needed for the next step of a quantum algorithm or a quantum communication process. Relevant figures of merit are therefore the fidelity with which the information can be written and retrieved, the storage time, and also the speed of the read-write process. Here, we present experimental data on a quantum memory consisting of a single ${}^{13}$C nuclear spin that is strongly coupled to the electron spin of a nitrogen-vacancy (NV) center in diamond. The strong hyperfine interaction of the nearest-neighbor carbon results in transfer times of 300 ns between the register qubit and the memory qubit, with an overall fidelity of 88 % for the write - storage - read cycle. The observed storage times of 3.3 ms appear to be limited by the T${}_1$ relaxation of the electron spin. We discuss a possible scheme that may extend the storage time beyond this limit.

7 pages, 6 figures

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Cited by in corpus (25)

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• Experimental protection of 2-qubit quantum gates against environmental noise by dynamical decoupling
• Quantum Optics Applications of Hexagonal Boron Nitride Defects
• Polarizing the electronic and nuclear spin of the NV-center in diamond in arbitrary magnetic fields: analysis of the optical pumping process
• Propagating Quantum Microwaves: Towards Applications in Communication and Sensing
• Characterization of hyperfine interaction between an NV electron spin and a first-shell 13C nuclear spin in diamond
• $\text{Ab initio}$ and group theoretical study of properties of the ${\text{C}}_{\text{2}}{\text{C}}_{\text{N}}$ carbon trimer defect in h-BN
• Efficient quantum error correction of dephasing induced by a common fluctuator
• Temperature drift rate for nuclear terms of NV center ground state Hamiltonian
• Optimisation of diamond quantum processors
• Dark State Polarizing a Nuclear Spin in the Vicinity of a Nitrogen-Vacancy Center
• Protecting solid-state spins from strongly coupled environment
• Improved indirect control of nuclear spins in diamond NV centers
• Universal quantum computation by the unitary control of ancilla qubits and using a fixed ancilla-register interaction
• Single NV Centers as Sensors for Radio-Frequency Fields
• Decoherence-free quantum register of nuclear spins in diamond
• Pulse sequences for controlled 2- and 3-qubit gates in a hybrid quantum register
• Implementations of two-photon four-qubit Toffoli and Fredkin gates assisted by nitrogen-vacancy centers
• Level anti-crossings of an NV center in diamond: Decoherence-free subspaces and 3D sensors of microwave magnetic fields
• Optimal photon energies for initialization of hybrid spin quantum registers of NV centers in diamond
• Interaction of Nitrogen-Vacancy Centers in Diamond with a Dense Ensemble of Carbon-13
• Highly Efficient and Broadband Optical Delay Line towards a Quantum Memory