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Measurement-device-independent Quantum Key Distribution with Uncharacterized Qubit Sources
Measurement-device-independent Quantum Key Distribution Uncharacterized Qubit Sources
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2016/1/23
Measurement-device-independent quantum key distribution (MDIQKD) is proposed to be secure against any possible detection attacks. The security of the original proposal relies on the assumption that th...
Entanglement-based quantum key distribution with biased basis choice via free space
Entanglement-based quantum key distribution iased basis choice via free space
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2016/1/23
We report a free-space entanglement-based quantum key dis-tribution experiment, implementing the biased basis protocol between two sites which are 15.3 km apart. Photon pairs from a polarization-entan...
Quantum Metrology with Dicke Squeezed States
quantum metrology Dicke squeezed state entanglement
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2016/1/22
We introduce a new class of quantum many-particle entangled states, called the Dicke squeezed (or DS) states, which can be used to improve the precision in quantum metrology beyond the standard quantu...
High Fidelity Quantum Gates for Trapped Ions under Micromotion
High Fidelity Quantum Gate Trapped Ions Micromotion
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2016/1/22
Two- or three-dimensional Paul traps can confine a large number of ions forming a Wigner crystal, which would provide an ideal architecture for scalable quantum computation except for the micromotion,...
Measurement-Device-Independent Quantum Key Distribution over 200 km
Measurement-Device-Independent Quantum Key Distribution
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2016/1/22
Measurement-device-independent quantum key distribution (MDIQKD) protocol is immune to all attacks on detection and guarantees the information-theoretical security even with imperfect single-photon de...
Practical and Fast Quantum Random Number Generation Based on Photon Arrival Time Relative to External Reference
Practical Fast Quantum Random Number Generation Photon Arrival Time Relative External Reference
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2016/1/22
We present a practical high-speed quantum random number generator, where the timing of single-photon detection relative to an external time reference is measured as the raw data. The bias of the raw d...
From Transistor to Trapped-ion Computers for Quantum Chemistry
Transistor Trapped-ion Computers Quantum Chemistry
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2016/1/22
Over the last few decades, quantum chemistry has progressed through the development of computational methods based on modern digital computers. However, these methods can hardly fulfill the exponentia...
Introduction to Quantum Algorithms for Physics and Chemistry
Introduction Quantum Algorithms Physics Chemistry
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2016/1/22
Controllable quantum systems provide unique opportunities for solving problems in quantum chemistry and many-body physics that are intractable by classical computers. This approach is called “quantum ...
Why the Quantitative Condition Fails to Reveal Quantum Adiabaticity
adiabatic computing quantum adiabatic condition adiabatic approximation
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2016/1/22
The quantitative adiabatic condition (QAC), or quantitative condition, is a convenient (a priori) tool for estimating the adiabaticity of quantum evolutions. However, the range of the applicability of...
Local Convertibility and Edge States in Quantum Many Body Systems
Local Convertibility Edge States Quantum Many Body Systems
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2016/1/22
In some many-body systems, certain ground-state entanglement (Rényi) entropies increase even as the correlation length decreases. This entanglement nonmonotonicity is a potential indicator of nonclass...
Demon-like Algorithmic Quantum Cooling and Its Realization with Quantum Optics
Demon-like Algorithmic Quantum Cooling Quantum Optics
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2016/1/22
Simulation of the low-temperature properties of many-body systems remains one of the major challenges in theoretical 1–3 and experimental 4–6 quantum information science. We present, and demonstrate e...
Time Reversal and Charge Conjugation in an Embedding Quantum Simulator
Charge Conjugation Embedding Quantum Simulator
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2016/1/22
A quantum simulator is an important device that may soon outperform current classical computations. A basic arithmetic operation, the complex conjugate, however, is considered to be impossible to be i...
Experimental Test of Quantum Jarzynski Equality with a Trapped Ion System
Quantum Jarzynski Equality Trapped Ion System
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2016/1/22
TheJarzynskiequalityrelatesthefree-energydiferencebetweentwoequilibriumstatestotheworkdoneonasystemthrough far-from-equilibriumprocesses amilestonethatbuildsonthepioneeringworkofClausiusandKelvin.Alth...
Resonator-Assisted Quantum Bath Engineering of a Flux Qubit
Resonator-Assisted Quantum Bath Engineering Flux Qubit
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2016/1/22
We demonstrate quantum bath engineering for preparation of any orbital state with the controllable phase factor of a superconducting flux qubit assisted by a microwave coplanar waveguide resonator. We...
Quantum Zeno and Zeno-like effects in nitrogen vacancy center
Quantum Zeno Zeno-like effects nitrogen vacancy center
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2016/1/22
We present a proposal to realize the quantum Zeno effect (QZE) and quantum Zeno-like effect (QZLE) in a proximal 13 C nuclear spin by controlling a proximal electron spin of a nitrogen vacancy (NV) c...