Coherent-feedback Quantum Control with Cold Atomic Spins

2012 ◽  
Author(s):  
Hideo Mabuchi
Keyword(s):  
Quantum Control ◽  
Atomic Spins ◽  
Cold Atomic Spins

Quantum Parameter Estimation With Cold Atomic Spins

2007 ◽  
Author(s):  
Anthony Miller ◽  
John Stockton ◽  
Magnus Hsu ◽  
Orion Crisafulli ◽  
Gopal Sarma ◽  
...  
Keyword(s):  
Parameter Estimation ◽  
Quantum Parameter ◽  
Atomic Spins ◽  
Cold Atomic Spins ◽  
Quantum Parameter Estimation

scholarly journals Quantum noise of cold atomic spins illuminated with non-classical light

1998 ◽  
Vol 2 (3) ◽  
pp. 93 ◽  
Author(s):  
J. Hald ◽  
Jens Sorensen ◽  
L. Leich ◽  
Eugene Polzik
Keyword(s):  
Quantum Noise ◽  
Atomic Spins ◽  
Cold Atomic Spins

scholarly journals Light-mediated strong coupling between a mechanical oscillator and atomic spins 1 meter apart

Science ◽  
2020 ◽  
Vol 369 (6500) ◽  
pp. 174-179 ◽  
Author(s):  
Thomas M. Karg ◽  
Baptiste Gouraud ◽  
Chun Tat Ngai ◽  
Gian-Luca Schmid ◽  
Klemens Hammerer ◽  
...  
Keyword(s):  
Strong Coupling ◽  
Quantum Physics ◽  
Quantum Control ◽  
Strong Interactions ◽  
Long Distance ◽  
Atomic Spin ◽  
Atomic Spins ◽  
Feedback Networks ◽  
Noise Squeezing ◽  
Opening Up

Engineering strong interactions between quantum systems is essential for many phenomena of quantum physics and technology. Typically, strong coupling relies on short-range forces or on placing the systems in high-quality electromagnetic resonators, which restricts the range of the coupling to small distances. We used a free-space laser beam to strongly couple a collective atomic spin and a micromechanical membrane over a distance of 1 meter in a room-temperature environment. The coupling is highly tunable and allows the observation of normal-mode splitting, coherent energy exchange oscillations, two-mode thermal noise squeezing, and dissipative coupling. Our approach to engineering coherent long-distance interactions with light makes it possible to couple very different systems in a modular way, opening up a range of opportunities for quantum control and coherent feedback networks.

INTEGRABILITY, ENTROPY AND QUANTUM COMPUTATION

1999 ◽  
Vol 10 (07) ◽  
pp. 1205-1228 ◽  
Author(s):  
E. V. KRISHNAMURTHY
Keyword(s):  
Quantum Computation ◽  
Quantum Chaos ◽  
Quantum Control ◽  
Dynamical Evolution ◽  
Open Problems ◽  
Quantum Integrability ◽  
Feynman Path Integrals ◽  
Exact Integrability ◽  
Time Arrow ◽  
Computational Systems

The important requirements are stated for the success of quantum computation. These requirements involve coherent preserving Hamiltonians as well as exact integrability of the corresponding Feynman path integrals. Also we explain the role of metric entropy in dynamical evolutionary system and outline some of the open problems in the design of quantum computational systems. Finally, we observe that unless we understand quantum nondemolition measurements, quantum integrability, quantum chaos and the direction of time arrow, the quantum control and computational paradigms will remain elusive and the design of systems based on quantum dynamical evolution may not be feasible.

Liquid-phase adaptive femtosecond quantum control: Removing intrinsic intensity dependencies

2003 ◽  
Vol 118 (8) ◽  
pp. 3692-3701 ◽  
Author(s):  
T. Brixner ◽  
N. H. Damrauer ◽  
B. Kiefer ◽  
G. Gerber
Keyword(s):  
Liquid Phase ◽  
Quantum Control
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