Significance: Wide-field measurement of cellular membrane dynamics with high spatiotemporal resolution can facilitate analysis of the computing properties of neuronal circuits. Quantum microscopy using a nitrogen-vacancy (NV) center is a promising technique to achieve this goal.
Aim: We propose a proof-of-principle approach to NV-based neuron functional imaging.
Approach: This goal is achieved by engineering NV quantum sensors in diamond nanopillar arrays and switching their sensing mode to detect the changes in the electric fields instead of the magnetic fields, which has the potential to greatly improve signal detection. Apart from containing the NV quantum sensors, nanopillars also function as waveguides, delivering the excitation/emission light to improve sensitivity. The nanopillars also improve the amplitude of the neuron electric field sensed by the NV by removing screening charges. When the nanopillar array is used as a cell niche, it acts as a cell scaffolds which makes the pillars function as biomechanical cues that facilitate the growth and formation of neuronal circuits. Based on these growth patterns, numerical modeling of the nanoelectromagnetics between the nanopillar and the neuron was also performed.
Results: The growth study showed that nanopillars with a 2-μm pitch and a 200-nm diameter show ideal growth patterns for nanopillar sensing. The modeling showed an electric field amplitude as high as ≈1.02 × 1010 mV / m at an NV 100 nm from the membrane, a value almost 10 times the minimum field that the NV can detect.
Conclusion: This proof-of-concept study demonstrated unprecedented NV sensing potential for the functional imaging of mammalian neuron signals.
The Australian National University and EOS Space Systems have teamed up to equip the EOS laser space debris tracking station on Mount Stromlo near Canberra, Australia, with sodium Laser Guide Star (LGS) Adaptive Optics (AO). The AO system is used to correct for laser beam degradation caused by the atmospheric turbulence on the upward infrared laser pulse used to illuminate space debris. As a result, the AO-equipped laser tracking station can track smaller and more distant debris. This paper presents the joint ANU/EOS AO Demonstrator LGS facility requirements, architecture, and performance at the time of the conference.
In this paper we report the first demonstration of “cavity enhanced rephased amplified spontaneous emission”. The
rephased amplified spontaneous emission (RASE) protocol provides an all-in-one photon-pair source and quantum
memory that has applications as a quantum repeater node. Cavity enhancement of the interaction of the optical mode
with the ensemble has the potential to improve the fidelity of the entanglement of the photon pairs. Using heterodyne detection, amplified emission and photon echo induced rephased amplified emission were observed from a Pr3+ doped Y2SiO5 crystal placed in a Fabry Perot cavity with a finesse of 70. Modifications to the experiment to allow non-classical correlations to be observed are discussed.
Here we show that the photon echo equivalent of an NMR gradient echo is completely efficient if the sample is
optically thick, the detunings of the atoms vary linearly along the direction of propagation and the storage time
is short compared to the decay rate of the atoms. In this process the only light that interacts with the sample
of atoms during the storage and retrieval process is the light that is to be stored and then retrieved, their are
no auxiliary beams. The stored and recalled light travel in the same direction and their is no need for the phase
matching operation that is present in previous quantum memory proposals using controlled inhomogeneous
broadening. This greatly simplifies various possible implementations. We present analytical, numerical and
experimental results of this scheme. We report experimental efficiencies of up to 15% and suggest simple realizable
improvements to significantly increase the efficiency.
We discuss how Very Large Scale Integration (VLSI) fabrication techniques can be used to build scalable solid-state quantum computers in diamond with either room temperature operation, or low temperature operation with photonic control. For this discussion we consider nitrogen-vacancy (NV) color centers where the qubits are electron and/or nuclear spins. To achieve scalability the NV centers are placed in well-defined locations using ion implantation, and are
controlled using optical and/or microwave excitation as well as localized static electric and/or magnetic fields.
Conference Committee Involvement (9)
Quantum Computing, Communication, and Simulation
6 March 2021 | San Francisco, California, United States
Advanced Optical Techniques for Quantum Information, Sensing, and Metrology
4 February 2020 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication XII
5 February 2019 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication XI
29 January 2018 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication X
31 January 2017 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication IX
16 February 2016 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication VIII
10 February 2015 | San Francisco, California, United States
Advances in Photonics of Quantum Computing, Memory, and Communication VII
4 February 2014 | San Francisco, California, United States
Advanced Optical and Quantum Memories and Computing