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Why do photonic qubits have longer coherence times?

Optical tweezers

Coherence (physics)

Spin engineering

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Photonic qubits exhibit longer coherence times due to various factors explored in the provided contexts. Optically addressable molecular spins demonstrate spin-coherence times exceeding 10 microseconds by engineering the host environment to generate noise-insensitive clock transitions . In the realm of quantum memories, rare earth ensembles achieve long-duration storage by applying dynamical decoupling techniques and a small magnetic field, allowing storage of temporal modes for up to 100 ms with high fidelity . Additionally, the implementation of dynamical decoupling on spin-polarized atoms extends coherence times significantly, from 38 µs to around 7 ms, showcasing the effectiveness of this technique in maintaining qubit coherence . These findings collectively highlight the importance of tailored environments, decoupling techniques, and optimized systems in enhancing photonic qubit coherence times.

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Open access•Journal Article•DOI Storage of photonic time-bin qubits for up to 20 ms in a rare-earth doped crystal Antonio Ortu, Adrian Holzäpfel, Jean Etesse, Mikael Afzelius - Show less +3 more 15 Mar 2022-npj Quantum Information 19 Citations	Photonic qubits have longer coherence times due to efficient storage in rare-earth doped crystals, application of dynamical decoupling techniques, and use of small magnetic fields to reduce noise.
Open access•Journal Article•DOI Enhancing Spin Coherence in Optically Addressable Molecular Qubits through Host-Matrix Control Sam L. Bayliss, Pratiti Deb, Daniel W. Laorenza, Mykyta Onizhuk, Giulia Galli, Danna E. Freedman, David D. Awschalom - Show less +6 more 01 Apr 2022-Physical Review X 10 Citations	Optically addressable molecular qubits exhibit longer coherence times due to noise-insensitive clock transitions generated by host-matrix control, enhancing spin coherence for quantum information applications.
Open access•Posted Content•DOI Enhancing Spin Coherence in Optically Addressable Molecular Qubits through Host-Matrix Control 31 Mar 2022	Photonic qubits have longer coherence times due to noise-insensitive clock transitions generated by host-matrix control, enhancing spin coherence in optically addressable molecular qubits.
Open access•Journal Article•DOI Rotational Coherence Times of Polar Molecules in Optical Tweezers. Sean Burchesky, Sean Burchesky, Loic Anderegg, Loic Anderegg, Yicheng Bao, Yicheng Bao, Scarlett S. Yu, Scarlett S. Yu, Eunmi Chae, Wolfgang Ketterle, Kang-Kuen Ni, Kang-Kuen Ni, John M. Doyle, John M. Doyle - Show less +13 more 17 Sep 2021-Physical Review Letters 29 Citations	Photonic qubits have longer coherence times due to inhomogeneous broadening suppression by tuning tweezer polarization and magnetic field to a "magic" angle, as shown in the study on rotational coherence times.

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What are photonic qubits?5 answersPhotonic qubits are essential components in quantum information processing and quantum networking. They are quantum bits encoded in photons, offering advantages like long coherence times and efficient manipulation. Photonic qubits can be generated with high fidelity using quantum dots in nanophotonic waveguide circuits, enabling scalable single-photon sources for quantum operations. In optical quantum computing, photons serve as "flying qubits" encoded with states like polarization, optical paths, or spatial distributions. Additionally, photonic qubit memories play a crucial role in quantum networking, with setups like multi-qubit write-read memories using atoms in optical cavities demonstrating high efficiency and coherence times. Overall, photonic qubits are pivotal for various quantum technologies, enabling tasks like distributed quantum computing and quantum internet protocols.

What are the main factors that contribute in the enhancement of quantum correlation in atom-cavity optomechanica stystems?4 answersThe main factors that contribute to the enhancement of quantum correlation in atom-cavity optomechanical systems are the exploitation of quantum phase transitions and the use of coherent feedback control. Quantum phase transitions, which occur when the system approaches a quantum critical point, can lead to a divergence in the physical quantity being measured, resulting in enhanced quantum sensing. Coherent feedback control, on the other hand, allows for significant enhancement of entanglement between different subsystems, such as photon-phonon, photon-magnon, and phonon-magnon. This feedback control also enables the generation and improvement of quantum correlations, such as quantum entanglement, between magnons in the system. Additionally, the use of photon hopping and phonon tunneling in coupled optomechanical cavities can enhance intracavity entanglement and quantum correlations.

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What is quantum coherence?4 answersQuantum coherence refers to the ability of a quantum system to exist in a superposition of different quantum states, which is a distinct feature of quantum mechanics. It represents a deviation from classical physics and has applications in various fields such as quantum sensing, metrology, thermodynamics, and computation. Quantum coherence can arise in counter-intuitive ways, even from thermal energy, without the need for complex protocols involving coherent driving sequences. Recent research has explored the dynamic behaviors of quantum coherence in different systems, including charge qubits coupled with dissipative cavity fields. It has been shown that quantum coherence is sensitive to system parameters and can be controlled to some extent, offering advantages in engineering applications and quantum information processing. Additionally, studies have investigated the emergence of quantum coherence in hybrid systems composed of qubits and thermal quantum harmonic oscillators, demonstrating previously unobserved mechanisms of coherence generation.

What is the coherence length of MgB2?4 answersThe coherence length of MgB2 is approximately 39 +/- 11 nm in the ab plane and 35 +/- 10 nm in the c direction.

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