1. Nuclear spins in nanostructures - Coish - Wiley Online Library.
2. (PDF) Nonvolatile nuclear spin memory enables sensor-unlimited.
3. Solid-state quantum memory using the P-31 nuclear spin.
4. Optical quantum memory made from single nuclear spin in nitrogen.
5. Nonvolatile nuclear spin memory enables sensor.
6. Decoherence of nuclear spin quantum memory in a quantum dot.
7. Excited-State Spin Manipulation and Intrinsic Nuclear Spin Memory using.
8. A quantum spectrum analyzer enhanced by a nuclear.
9. Computer Spin Memory: Physicists Read Data Stored in Atomic.
10. US9361962B2 - Solid-state quantum memory based on a nuclear.
11. Protecting a Diamond Quantum Memory by Charge State Control.
12. Optimization of optical spin readout of the nitrogen... - AIP Publishing.
13. PDF Precise high-fidelity electron-nuclear spin entangling gates in NV.

Nuclear spins in nanostructures - Coish - Wiley Online Library.

Entanglement swapping between the electron spin and the long-lived nuclear quantum memory [40], [98], can free up the communication qubit, enabling high-fidelity multi-qubit protocols [99]. NMR and Spin When a spin-½ particle is in a magnetic field, the particle can either align with the field or align against the field. As the particles — in this case protons and neutrons — form nuclei, the nuclei have a net spin.

(PDF) Nonvolatile nuclear spin memory enables sensor-unlimited.

The nuclear spin is a natural memory qubit which can store the cloned quantum state23,27, while the electron spin that carries the original state can be linked with photons, the ideal flying qubits for quantum communication, through a quantum interface23,28,29. These features are important for application of quantum cloning3,5. Each of the registers 50b and 50c comprises an input 51b and 51c which is connected, via a switch, to an output of the memory 33 and via which the nuclear spin density data of a row are input into the shift registers 50b and 50c. In reaction to each pulse generated by the clock 55, the switch 55 switches over, so that the nuclear spin density. Electron and nuclear spins associated with point defects in insulators are promising systems for solid-state quantum technology. The electron spin is usually used for readout and addressing, and nuclear spins are used as exquisite quantum bits and memory systems. With these systems, single-shot read.

Solid-state quantum memory using the P-31 nuclear spin.

Here we study the decoherence of this memory due to nuclear spin dipolar coupling and inhomogeneous hyperfine interaction during the storage period. In particular, by performing spectroscopy on the nuclear spin, we find that it is coupled to a system consistent with two spin-1/2 nuclear spins. These results provide a pathway towards interacting. In a much shorter time, the physicists read and reread the same nuclear spin data 2,000 times, showing the act of reading the spin data doesn't destroy it, making the memory reliable, Boehme says.

Optical quantum memory made from single nuclear spin in nitrogen.

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. 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.

Nonvolatile nuclear spin memory enables sensor.

To this end, we investigate the application of the intrinsic nitrogen nuclear spin (below called memory spin) for robust intermediate storage of classical metrology information. The nonvolatile classical memory furthermore allows decoupling of target spins from the sensor thus closing the decay channel. Implementation of the nuclear spin memory Our two-qubit sensor exploits the four-level system formed by the m S ∈ {0, −1} subspace of the S = 1 electronic spin and the two m I ∈ {−1/2, +1/2} states.

Decoherence of nuclear spin quantum memory in a quantum dot.

Even though the long coherence time of the nuclear spins makes them promising candidates for quantum memory [22, 49], entanglement purification [50, 51], and quantum nodes in quantum computing and communication, one of the main challenges is that the interactions between the electronic spin and the nuclear spin memory qubits are always on. As a. "The nuclear spin is much more immune to the environment," McCamey says.... So even if the electron itself loses its memory, its spin contents have been preserved via proxy. Nuclear spin Memory Logic 1. Introduction The advance of semiconductor technology over the last four decades is often represented by Moore's law which predicted the approximate doubling of switches or transistor devices in an integrated circuit nearly every 18 months.

Excited-State Spin Manipulation and Intrinsic Nuclear Spin Memory using.

Finally, we demonstrate coherent coupling of an erbium electronic spin to a nearby nuclear spin and implement single-qubit and two-qubit gates on them, thus extending our platform's prowess as a quantum memory by making a long-lived nuclear spin register available for storage and retrieval of information. These results are a significant step. In recent years, solid-state spin systems have emerged as promising candidates for quantum information processing. Prominent examples are the nitrogen-vacancy (NV) center in diamond, phosphorus dopants in silicon (Si:P), rare-earth ions in solids, and V Si-centers in silicon-carbide.The Si:P system has demonstrated that its nuclear spins can yield exceedingly long spin coherence times by.

A quantum spectrum analyzer enhanced by a nuclear.

We probe dephasing mechanisms within a quantum network node consisting of a single nitrogen-vacancy center electron spin that is hyperfine coupled to surrounding C13 nuclear-spin quantum memories. Previous studies have analyzed memory dephasing caused by the stochastic electron-spin reset process, which is a component of optical internode entangling protocols. Here, we find, by using dynamical. These nuclear spins serve as memory quantum bits. Figure 1 shows the experiment schematically. A single NV center is selected in a focused laser beam (see Fig. 1 a). All experiments are carried out at temperatures T ∼ 6 K such that the sample, its positioner as well as microwave coupling structures are mounted in a cryostat (Fig. 1 b). A second resource, the nuclear spin of the intrinsic nitrogen atom, may be an ideal candidate for a quantum memory due to both the long coherence of nuclear spins and their deterministic presence. We investigate coherent swaps between the NV center electronic spin state and the nuclear spin state of nitrogen using Landau-Zener transitions.

Computer Spin Memory: Physicists Read Data Stored in Atomic.

We probe dephasing mechanisms within a quantum network node consisting of a single nitrogen-vacancy center electron spin that is hyperfine coupled to surrounding $^{13}\mathrm{C}$ nuclear-spin quantum memories. Previous studies have analyzed memory dephasing caused by the stochastic electron-spin reset process, which is a component of optical internode entangling protocols.

US9361962B2 - Solid-state quantum memory based on a nuclear.

Nuclear-spin-based quantum memory. The quantum bits created in diamond by Maurer et al. and in silicon by Steger et al. can both be read out optically, and both couple to nearby nuclear spins, which can be used as a long-lived quantum memory. Thus, according our theory, the nuclear spin ensembles are the "mind-screen" with nuclear spins as its pixels, the neural membranes and proteins are the mind-screen and memory matrices, and the biologically available paramagnetic species such as O 2 and NO are pixel-activating agents. Together, they form the neural substrates of consciousness. 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.

Protecting a Diamond Quantum Memory by Charge State Control.

Nuclear spins are known to benefit from long coherence times compared to electron spins, but are slow to manipulate and suffer from weak thermal polarisation. A powerful model for quantum computation is thus one in which electron spins are used for processing and readout while nuclear spins are used for storage. 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. But it is not nuclear spin because nuclear spin is I=L+s. in our case the last nucleon is in d (5/2) shell (easily seen from nuclear shell model spectrum) I =L+s =2+1/2 =5/2 which is its nuclear spin. so in this way you can find out the nuclear spin of any state. ok bye.

Optimization of optical spin readout of the nitrogen... - AIP Publishing.

We further show that nuclear-spin polarization enables the use of well-known methods for initialization and long-time coherent storage of quantum states. The proposed nuclear-spin preparation protocol thus marks the first step towards an all-optically controlled integrated platform for quantum technology with TM defects in SiC. Submission history. Finally, we explored the coherence properties of the nuclear spin quantum memory. In contrast to the electron spin, which dephases on a time scale T 2e *∼1 μs for this NV center, the nuclear spin free precession signal persisted out to ∼0.5 ms (T 2n * = 495 ± 30 μs in Fig. 4A). Characteristic collapses and revivals in the data correspond. The potency of two xenon isotopes with nuclear spin, xenon 129 and xenon 131, is less than the potency of two xenon isotopes, xenon 132 and xenon 134, that do not have nuclear spin. This difference in potency cannot be explained, either by differences in outer electron shells (there are none) or the variations in atomic mass. The results suggest that some of the effects of xenon on.

PDF Precise high-fidelity electron-nuclear spin entangling gates in NV.

A Schematic representation of the sensor - memory pair comprising the electron and 14 N nuclear spin of an NV center in diamond. The inset sketches potential locations of 13 C target spins.

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