- Electromagetically induced transparency with nuclear spin.
- Nuclear-Spin Quantum Memory Poised to Take the Lead.
- Excited-State Spin Manipulation and Intrinsic Nuclear Spin Memory using.
- Nuclear spin based memory and logic in quantum Hall.
- Is quantum physics behind your brain's ability to think?.
- A new spin on nuclear magnetic moments | MIT News | Massachusetts.
- CiteSeerX — Citation Query Nuclear spin based memory and logic in.
- Decoherence of nuclear spin quantum memory in a quantum dot | IEEE.
- Optical quantum memory made from single nuclear spin in nitrogen.
- Solid state quantum memory using the 31P nuclear spin.
- Nuclear spin memory.
- Proposals of nuclear spin quantum memory in group-IV elemental and II.
Electromagetically induced transparency with nuclear spin.
Because the nuclear spin states interact very weakly with their environment, they are resistant to decoherence due to inelastic collisions and inhomogenous fields.... 020.2070 Atomic ensembles have found use in a variety of quantum information experiments: quantum memory [1-3], quantum repeaters We employ a gas-phase ensemble of atoms with.
Nuclear-Spin Quantum Memory Poised to Take the Lead.
Nitrogen nuclear spin is available for every nitrogen vacancy center (NV) in diamond. Besides it can be a robust quantum memory for spin qubit operations, nitrogen nuclear spin can couple to photon by taking advantage of optically resonant excitation of spin-selective transitions in low temperature. Here we demonstrate the coherent storage of.
Excited-State Spin Manipulation and Intrinsic Nuclear Spin Memory using.
The state is left in the nuclear spin on a time-scale that is long compared with the electron decoherence time, and is then coherently transferred back to the electron spin, thus demonstrating the P-31 nuclear spin as a solid-state quantum memory. The overall store - readout fidelity is about 90 per cent, with the loss attributed to imperfect..
Nuclear spin based memory and logic in quantum Hall.
Influence of Nuclear Spin Polarization on Quantum Wire Conductance by James A. Nesteroff, Yuriy V. Pershin, Vladimir Privman , 2004 Abstract — In this work, we study a possibility to measure the transverse and longitudinal relaxation times of a collection of polarized nuclear spins located in the region of a quantum wire via its conductance. 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,. The nitrogen-vacancy defect centre in diamond 10. These applications rely on the ability to position a single nitrogen-vacancy centre within a few nanometres of a sample, and then scan it across the sample surface, while preserving the centre's spin coherence and readout fidelity.
Is quantum physics behind your brain's ability to think?.
Electron spins are strong candidates with which to implement spintronics because they are both mobile and able to be manipulated. The relatively short lifetimes of electron spins, however, present a problem for the long-term storage of spin information. We demonstrated an ensemble nuclear spin memory in phosphorous-doped silicon, which can be read out electrically and has a lifetime exceeding. On the other hand, dynamic nuclear polarization enabled by the hyperfine coupling between the electron and nuclear spins can be utilized as a memory resource [46, 53] or even as a rechargable spin.
A new spin on nuclear magnetic moments | MIT News | Massachusetts.
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.
CiteSeerX — Citation Query Nuclear spin based memory and logic in.
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. 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. We demonstrated an ensemble nuclear spin memory in phosphorous-doped silicon, which can be read out electrically and has a lifetime exceeding 100 seconds. 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.
Decoherence of nuclear spin quantum memory in a quantum dot | IEEE.
The ability to perform electron spin resonance (ESR) at high magnetic fields (~ 8.5 T) allows us to work in the regime where electron spins are highly polarized–a situation which mimics the spin polarization expected in spintronic devices. The aim of. 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.
Optical quantum memory made from single nuclear spin in nitrogen.
We use the 15 N nuclear spin in the present NV center as the memory. Figure 4(a) schematically shows the pulse sequence and the resulting PL. We start to explain the first readout as an example (see “first” in Fig. 4(a)]. The MW pulse restores the nuclear spin state to the electron spin state, and the laser pulse is used to read it out.
Solid state quantum memory using the 31P nuclear spin.
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. Here we demonstrate the coherent transfer of a superposition state in an electron spin 'processing' qubit to a nuclear spin 'memory' qubit, using a combination of microwave and radiofrequency pulses applied to 31P donors in an isotopically pure 28Si crystal. The electron spin state can be stored in the nuclear spin on a timescale that is long. (b) Number of sequence repetitions that are possible before the nuclear qubit Bloch vector length drops to 1 / e of its initial value, for qubits encoded in single nuclear spins (empty circles) and in two-spin states (filled circles) of different effective coupling strengths Δ ω. The four depicted data sets are taken for increasing repump.
Nuclear spin memory.
Solid-state nuclear-spin quantum memory is progressing rapidly, and the two studies described here show that it may well be the most effective way to store quantum information. The demonstration of quantum coherence lasting for time scales relevant to real-world conditions holds promise for as yet unimagined quantum-enabled technology becoming. University of Utah physicists stored information for 112 seconds in what may become the world's tiniest computer memory: magnetic "spins" in the centers or nuclei of atoms. Then the physicists retrieved and read the data electronically—a big step toward using the new kind of memory for both faster conventional and superfast "quantum" computers.
Proposals of nuclear spin quantum memory in group-IV elemental and II.
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. 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 O2 and NO are pixel-activating agents. Together, they form the neural substrates of consciousness. 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.
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