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Springer eBooks

Principal Squeezing in Optical Devices

Vlasta Peřinová, Concita Sibilia, M. Bertolotti, Jan Peřina

Published Jan 1, 1990• 0 citations
Publisher
DOI
10.1007/978-1-4613-0847-8_162

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We present a conceptual design for a medical imaging device capable of scanningthe entire human body (0.07 m3) at isotropic cellular resolution (10 μm) in under onesecond (0.22 s), enabling classical scan–transmit–reconstruct teleportation of macro-scopic organisms. The device combines: (i) an 11.7 T superconducting magnet with a0.9 m bore; (ii) a squeezed-state radio-frequency source (10 dB squeezing at 500 MHzvia Josephson Parametric Amplifier); (iii) a 581 GS/s arbitrary waveform generatorencoding 1.28 × 1011 compressed sensing projections; (iv) a quantum-limited homodynedetector array (I/Q, 581 GS/s); (v) a compressed sensing reconstruction engine process-ing 1010 sparse parameters; and (vi) a 10.2 Pb/s fiber-optic data link. No componentviolates known physics; the principal barriers are engineering: a 2× gap in AWG/ADCspeed, a 3×105× gap in real-time CS reconstruction throughput, and scaling Josephsonparametric amplification to 500 MHz. Total estimated cost is $1B with a 25–40 yeardevelopment timeline
The influence of losses in the transmission of continuous-variable entangled light through linear devices such as optical fibers is studied, with special emphasis on Gaussian states. Upper bounds on entanglement and the distance to the set of separable Gaussian states are calculated. Compared with the distance measure, the bounds can substantially overestimate the entanglement and thus do not show the drastic decrease of entanglement with increasing mean photon number, as does the distance measure. In particular, it shows that losses give rise to entanglement saturation, which principally limits the amount of information that can be transferred quantum mechanically in continuous-variable teleportation. Even for an initially infinitely squeezed two-mode squeezed vacuum, high-fidelity teleportation is only possible over distances that are much smaller than the absorption lengths.