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Local Hidden Variable Theories for Quantum States
Barbara M. Terhal, Andrew C. Doherty, David Schwab
While all bipartite pure entangled states violate some Bell inequality, the relationship between entanglement and non-locality for mixed quantum states is not well understood. We i…
Characterizing the entanglement of symmetric many-particle spin-1/2 systems
John K. Stockton, JM Geremia, Andrew C. Doherty +1
Analyzing the properties of entanglement in many-particle spin-1/2 systems is generally difficult because the system's Hilbert space grows exponentially with the number of constitu…
Photon statistics and dynamics of Fluorescence Resonance Energy Transfer
Andrew J. Berglund, Andrew C. Doherty, Hideo Mabuchi
We report high time-resolution measurements of photon statistics from pairs of dye molecules coupled by fluorescence resonance energy transfer (FRET). In addition to quantum-optica…
Exact Performance of Concatenated Quantum Codes
Benjamin Rahn, Andrew C. Doherty, Hideo Mabuchi
When a logical qubit is protected using a quantum error-correcting code, the net effect of coding, decoherence (a physical channel acting on qubits in the codeword) and recovery ca…
Adaptive homodyne measurement of optical phase
Michael A. Armen, John K. Au, John K. Stockton +2
We present an experimental demonstration of the power of real-time feedback in quantum metrology, confirming a theoretical prediction by Wiseman regarding the superior performance…