Mechanical Control of a Single Nuclear Spin.

Achieving control of phase memory relaxation times (T m) in metal ions is an important goal of molecular spintronics.Herein we provide the first evidence that nuclear-spin patterning in the ligand shell is an important handle to modulate T m in metal ions. We synthesized and studied a series of five V(iv) complexes with brominated catecholate ligands, [V(C 6 H 4-n Br n O 2) 3] 2-(n = 0, 1, 2. Recently, an ensemble of nuclear spins in a quantum dot have been proposed as a long-lived quantum memory. A quantum state of an electron spin in the dot can be faithfully transfered into nuclear spins through controlled hyperfine coupling. Here we study the decoherence of this memory due to nuclear spin dipolar coupling and inhomogeneous hyperfine interaction during the storage period.

Decoherence of nuclear spin quantum memory in a quantum dot.

The possibility that quantum processing with nuclear spins might be operative in the brain is explored. Phosphorus is identified as the unique biological element with a nuclear spin that can serve as a qubit for such putative quantum processing-a neural qubit-while the phosphate ion is the only possible qubit-transporter.We identify the "Posner molecule", Ca 9 (PO 4) 6, as the unique. Our system consists of a 13 C nucleus (spin I = 1/2) isolated in the nearly spin-free lattice of a diamond crystal. The nuclear spin undergoes a free precession around the z axis with an angular. We took advantage of a single nuclear-spin memory in order to obtain a 10-fold enhancement in the signal amplitude of the electronic spin readout. We also present a two-level, concatenated procedure to improve the readout by use of a pair of nuclear spin ancillae, an important step toward the realization of robust quantum information processors.

A Ten-Qubit Solid-State Spin Register with Quantum Memory up to One Minute.

This nuclear polarization manifests itself by repeated controlled electron-nuclear spin scattering in the Pauli spin blockade state. Polarized nuclei are also controlled coherently by means... Quantum memory for electron spin qubits has been theoretically investigated using fully polarized nuclear spins in quantum dots [14]. However, this. The electron spin state can be stored in the nuclear spin on a timescale that is long compared with the electron decoherence time and then coherently transferred back to the electron spin, thus demonstrating the 31P nuclear spin as a solid-state quantum memory. We have achieved transfer fidelities up to 90percent each way, which we attribute to. Schemes for the nuclear spin quantum memory are proposed based on a system composed of two electrons or one electron coupled to a single nuclear spin in isotopically purified group-IV elemental and II-VI compound semiconductors. The qubit consists of the singlet state and one of the triplet states of two electrons or simply of an electron spin.

‪Carlos A. Meriles‬ - ‪Google Scholar‬.

Nuclear "spins" can serve as memory for storing quantum information, while electron spins can be coupled to a photon to promote interactions with distant nitrogen-vacancy centers.... The nuclear spin is consequently protected from feedback errors through the hyperfine coupling by accurately timing the reinitialization of the electron spins. From mapping complex biological molecules to reading out quantum bits of information encoded in an electron or nuclear spin memory, a sensor with such sensitivity and resolution would have powerful applications. The aim of our current research is to utilize these defects to consistently demonstrate their sensing ability at room temperature by.

Single-shot electrical readout of an ensemble nuclear spin memory in.

Very recently, nuclear spin memory devices [32], [57], [58] and the indirect hyperfine interaction via electrons between nuclear spin qubits in semiconductor-based quantum computer proposals [33. Figure 1 (a) Nuclear spin imaging with a shallow NV center in diamond. A single NV spin (purple) at 1-2 nm from the diamond surface can sense single nuclear spins in a molecule (the chemokine receptor CXCR4 [], ribbon diagram) anchored to the diamond.The magnetic field produced by individual C 13 (spheres with color scale given by B ⊥ j / γ e) is in the range of nT, within reach of NV. Via a dynamically engineered spin-exchange interaction, we polarize this nuclear spin ensemble, generate collective spin excitations, and subsequently use them to implement a quantum memory. We.

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

The electronic spin information can be mapped onto and stored in the nuclear spin of the phosphorus donors, and the nuclear spins can then be repetitively read out electrically for time periods that exceed the electron spin lifetime. We discuss how this memory can be used in conjunction with other silicon spintronic devices. PMID: 21164011. Robust quantum-network memory using decoherence-protected subspaces of nuclear spins. The realization of a network of quantum registers is an outstanding challenge in quantum science and technology. We experimentally investigate a network node that consists of a single nitrogen-vacancy (NV) center electronic spin hyperfine-coupled to nearby. Achieving control of phase memory relaxation times (Tm) in metal ions is an important goal of molecular spintronics. Herein we provide the first evidence that nuclear-spin patterning in the ligand shell is an important handle to modulate Tm in metal ions. We synthesized and studied a series of five V(iv) com.

Nuclear Spin Quantum Memory in Silicon Carbide - NASA/ADS.

The nuclear spin qubits can thus be exploited as long-lived quantum memory, with coherence times greater than 1 second for single carbon nuclei in diamond, 30 seconds for single phosphorous nuclei in silicon, and 39 minutes for an ensemble of phosphorous nuclei in silicon. These record-breaking coherence times, together with the ability to.

Quantum Register Based on Individual Electronic and Nuclear Spin Qubits.

The state is left in the nuclear spin on a timescale that is long compared with the electron decoherence time, and is then coherently transferred back to the electron spin, thus demonstrating the 31 P nuclear spin as a solid-state quantum memory. The overall store-readout fidelity is about 90 per cent, with the loss attributed to imperfect. Subatomic quantum memory in diamond demonstrated Date: June 28, 2011... "The result is an extremely fast transfer of the quantum information to the long-lived nuclear spin, which could further. Here, we use the NV intrinsic nuclear spin as a nonvolatile classical memory to store NMR information, while suppressing sensor back-action on the target using controlled decoupling of sensor,.

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Nuclear spin memory