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25 September 2007 Rapid measurement of atomic clock-state qubits for violating Bell inequalities
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Optical clock-transitions such as the ones in Ytterbium are prime candidates for encoding qubits for quantum information processing applications due to very low decoherence rates. In this work, we investigate the challenges involved in using these prime candidates for fundamental tests of quantum mechanics. We design entangling operations for pairs of indistinguishable atoms trapped in optical tweezers, as well as determine the feasibility of rapid qubit rotation and measurement of qubits encoded in these desirable low-decoherence clock transitions. In particular, we propose multi-photon transitions for fast rotation of qubits, followed by ultrafast readout via resonant multiphoton ionization. The rapid measurement of atomic qubits is crucial for high-speed synchronization of quantum information processors, but is also of interest for tests of Bell inequalities. We investigate a Bell inequality test that avoids the detection loophole in entangled qubits, which are spacelike separated over only a few meters.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
René Stock, Nathan S. Babcock, Mark G. Raizen, and Barry C. Sanders "Rapid measurement of atomic clock-state qubits for violating Bell inequalities", Proc. SPIE 6710, Quantum Communications and Quantum Imaging V, 67100W (25 September 2007);

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