scholarly journals Optically addressable molecular spins for quantum information processing

Science ◽  
2020 ◽  
Vol 370 (6522) ◽  
pp. 1309-1312 ◽  
Author(s):  
S. L. Bayliss ◽  
D. W. Laorenza ◽  
P. J. Mintun ◽  
B. D. Kovos ◽  
D. E. Freedman ◽  
...  
Keyword(s):  
Quantum Information ◽  
Ground State ◽  
Information Science ◽  
Quantum Information Processing ◽  
Building Blocks ◽  
Quantum Systems ◽  
Quantum Information Science ◽  
Molecular Systems ◽  
Wide Range ◽  
State Spin

Spin-bearing molecules are promising building blocks for quantum technologies as they can be chemically tuned, assembled into scalable arrays, and readily incorporated into diverse device architectures. In molecular systems, optically addressing ground-state spins would enable a wide range of applications in quantum information science, as has been demonstrated for solid-state defects. However, this important functionality has remained elusive for molecules. Here, we demonstrate such optical addressability in a series of synthesized organometallic, chromium(IV) molecules. These compounds display a ground-state spin that can be initialized and read out using light and coherently manipulated with microwaves. In addition, through atomistic modification of the molecular structure, we vary the spin and optical properties of these compounds, indicating promise for designer quantum systems synthesized from the bottom-up.

scholarly journals Optical spin-state polarization in a binuclear europium complex towards molecule-based coherent light-spin interfaces

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Kuppusamy Senthil Kumar ◽  
Diana Serrano ◽  
Aline M. Nonat ◽  
Benoît Heinrich ◽  
Lydia Karmazin ◽  
...  
Keyword(s):  
Ground State ◽  
Quantum Information Processing ◽  
Optical Transition ◽  
Molecular Engineering ◽  
Coherent Light ◽  
Nuclear Spins ◽  
Rare Earth Ion ◽  
Molecular Systems ◽  
Homogeneous Linewidth ◽  
State Spin

AbstractThe success of the emerging field of solid-state optical quantum information processing (QIP) critically depends on the access to resonant optical materials. Rare-earth ion (REI)-based molecular systems, whose quantum properties could be tuned taking advantage of molecular engineering strategies, are one of the systems actively pursued for the implementation of QIP schemes. Herein, we demonstrate the efficient polarization of ground-state nuclear spins—a fundamental requirement for all-optical spin initialization and addressing—in a binuclear Eu(III) complex, featuring inhomogeneously broadened 5D0 → 7F0 optical transition. At 1.4 K, long-lived spectral holes have been burnt in the transition: homogeneous linewidth (Γh) = 22 ± 1 MHz, which translates as optical coherence lifetime (T2opt) = 14.5 ± 0.7 ns, and ground-state spin population lifetime (T1spin) = 1.6 ± 0.4 s have been obtained. The results presented in this study could be a progressive step towards the realization of molecule-based coherent light-spin QIP interfaces.

scholarly journals Quantum Entanglement: Separability, Measure, Fidelity of Teleportation, and Distillation

2010 ◽  
Vol 2010 ◽  
pp. 1-57 ◽  
Author(s):  
Ming Li ◽  
Shao-Ming Fei ◽  
Xianqing Li-Jost
Keyword(s):  
Quantum Information ◽  
Quantum Entanglement ◽  
Information Science ◽  
Quantum Information Processing ◽  
Quantum Information Science ◽  
Entanglement Witness ◽  
Separability Criteria ◽  
Quantum Entangled States ◽  
Matrix Normal ◽  
Bloch Representation

Quantum entanglement plays crucial roles in quantum information processing. Quantum entangled states have become the key ingredient in the rapidly expanding field of quantum information science. Although the nonclassical nature of entanglement has been recognized for many years, considerable efforts have been taken to understand and characterize its properties recently. In this review, we introduce some recent results in the theory of quantum entanglement. In particular separability criteria based on the Bloch representation, covariance matrix, normal form and entanglement witness, lower bounds, subadditivity property of concurrence and tangle, fully entangled fraction related to the optimal fidelity of quantum teleportation, and entanglement distillation will be discussed in detail.

Exploiting chemistry and molecular systems for quantum information science

2020 ◽  
Vol 4 (9) ◽  
pp. 490-504 ◽  
Author(s):  
Michael R. Wasielewski ◽  
Malcolm D. E. Forbes ◽  
Natia L. Frank ◽  
Karol Kowalski ◽  
Gregory D. Scholes ◽  
...  
Keyword(s):  
Quantum Information ◽  
Information Science ◽  
Quantum Information Science ◽  
Molecular Systems

scholarly journals Quantum tomography protocols with positivity are compressed sensing protocols

2015 ◽  
Vol 1 (1) ◽  
Author(s):  
Amir Kalev ◽  
Robert L Kosut ◽  
Ivan H Deutsch
Keyword(s):  
Quantum Mechanics ◽  
Quantum Information ◽  
Compressed Sensing ◽  
Information Science ◽  
Signal Reconstruction ◽  
Special Property ◽  
Quantum Tomography ◽  
Quantum Systems ◽  
Reconstruction Technique ◽  
Quantum Information Science

AbstractCharacterising complex quantum systems is a vital task in quantum information science. Quantum tomography, the standard tool used for this purpose, uses a well-designed measurement record to reconstruct quantum states and processes. It is, however, notoriously inefficient. Recently, the classical signal reconstruction technique known as ‘compressed sensing’ has been ported to quantum information science to overcome this challenge: accurate tomography can be achieved with substantially fewer measurement settings, thereby greatly enhancing the efficiency of quantum tomography. Here we show that compressed sensing tomography of quantum systems is essentially guaranteed by a special property of quantum mechanics itself—that the mathematical objects that describe the system in quantum mechanics are matrices with non-negative eigenvalues. This result has an impact on the way quantum tomography is understood and implemented. In particular, it implies that the information obtained about a quantum system through compressed sensing methods exhibits a new sense of ‘informational completeness.’ This has important consequences on the efficiency of the data taking for quantum tomography, and enables us to construct informationally complete measurements that are robust to noise and modelling errors. Moreover, our result shows that one can expand the numerical tool-box used in quantum tomography and employ highly efficient algorithms developed to handle large dimensional matrices on a large dimensional Hilbert space. Although we mainly present our results in the context of quantum tomography, they apply to the general case of positive semidefinite matrix recovery.

scholarly journals Quantum-classical correspondence of a system of interacting bosons in a triple-well potential

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 563
Author(s):  
E. R. Castro ◽  
Jorge Chávez-Carlos ◽  
I. Roditi ◽  
Lea F. Santos ◽  
Jorge G. Hirsch
Keyword(s):  
Quantum Information ◽  
Ground State ◽  
Information Science ◽  
Quantum Phase Transitions ◽  
Interaction Strength ◽  
Stationary Points ◽  
Semiclassical Analysis ◽  
Quantum Information Science ◽  
Highly Sensitive ◽  
Classical Correspondence

We study the quantum-classical correspondence of an experimentally accessible system of interacting bosons in a tilted triple-well potential. With the semiclassical analysis, we get a better understanding of the different phases of the quantum system and how they could be used for quantum information science. In the integrable limits, our analysis of the stationary points of the semiclassical Hamiltonian reveals critical points associated with second-order quantum phase transitions. In the nonintegrable domain, the system exhibits crossovers. Depending on the parameters and quantities, the quantum-classical correspondence holds for very few bosons. In some parameter regions, the ground state is robust (highly sensitive) to changes in the interaction strength (tilt amplitude), which may be of use for quantum information protocols (quantum sensing).

scholarly journals Molecule-based coherent light-spin interfaces for quantum information processing – optical spin state polarization in a binuclear Europium complex

2021 ◽  
Author(s):  
Kuppusamy Senthil Kumar ◽  
Diana Serrano ◽  
Aline Nonat ◽  
Benoît Heinrich ◽  
Lydia Karmazin ◽  
...  
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Ground State ◽  
Quantum Information Processing ◽  
Optical Transition ◽  
Molecular Engineering ◽  
Coherent Light ◽  
Rare Earth Ion ◽  
Homogeneous Linewidth ◽  
State Spin

Abstract The success of the emerging field of solid-state optical quantum information processing (QIP) critically depends on the access to resonant optical materials. Rare-earth ion (REI)- based molecular systems, whose quantum properties could be tuned taking advantage of molecular engineering strategies, are one of the systems actively pursued for the implementation of QIP schemes. Herein, we demonstrate the efficient polarization of 2 ground-state nuclear spins—a fundamental requirement for all-optical spin initialization and addressing—in a binuclear Eu(III) complex, featuring inhomogeneously broadened 5D0→7 F0 optical transition. At 1.4 K, long-lived spectral holes have been burnt in the transition: homogeneous linewidth (Γh) = 22 +/- 1 MHz, which translates as optical coherence lifetime (T2opt) = 14.5 +/- 0.7 ns, and ground-state spin population lifetime (T1spin) = 1.6 +/- 0.4 s have been obtained. The results presented in this study are a progressive step towards the realization of molecule-based coherent light-spin QIP interfaces.

Quantum Information Science

2012 ◽  
Author(s):  
Paul M. Alsing ◽  
Michael L. Fanto
Keyword(s):  
Quantum Information ◽  
Information Science ◽  
Quantum Information Science

Colloidal Quantum Dots as Platforms for Quantum Information Science

2020 ◽  
Author(s):  
Cherie R. Kagan ◽  
Lee C. Bassett ◽  
Christopher B. Murray ◽  
Sarah M. Thompson
Keyword(s):  
Quantum Dots ◽  
Quantum Information ◽  
Information Science ◽  
Colloidal Quantum Dots ◽  
Quantum Information Science

B800–B850 coherence correlates with energy transfer rates in the LH2 complex of photosynthetic purple bacteria

2015 ◽  
Vol 17 (46) ◽  
pp. 30805-30816 ◽  
Author(s):  
Cathal Smyth ◽  
Daniel G. Oblinsky ◽  
Gregory D. Scholes
Keyword(s):  
Energy Transfer ◽  
Quantum Information ◽  
Information Science ◽  
Light Harvesting ◽  
Purple Bacteria ◽  
Quantum Information Science ◽  
Light Harvesting Complex ◽  
Transfer Rates ◽  
Photosynthetic Purple Bacteria

Delocalization of a model light-harvesting complex is investigated using multipartite measures inspired by quantum information science.

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