Quantum error correction ͑QEC͒ is an essential element of physical quantum information processing systems. Most QEC efforts focus on extending classical error correction schemes to the quantum regime. The input to a noisy system is embedded in a coded subspace, and error recovery is performed via an operation designed to perfectly correct for a set of… (More)
recommendations are those of the author and are not necessarily endorsed by the United States Government. ABSTRACT To achieve high signal-to-noise ratios (SNR) while maintaining moderate sensor size, an architecture is proposed to combine several independent radar apertures into a coherently functioning unit. The proposed system utilizes several distinct… (More)
Error correction procedures are considered which are designed specifically for the amplitude damping channel. Amplitude damping errors are analyzed in the stabilizer formalism. This analysis allows a generalization of the <i>[4,1]</i> ldquoapproximaterdquo amplitude damping code. This generalization is presented as a class of <i>[2(M</i>+1),<i>M</i>] codes;… (More)
Quantum error correction (QEC) is an essential concept for any quantum information processing device. Typically, QEC is designed with minimal assumptions about the noise process; this generic assumption exacts a high cost in efficiency and performance. We examine QEC methods that are adapted to the physical noise model. In physical systems, errors are not… (More)
We propose and demonstrate a scalable high-sensitivity approach for achieving multi-rate DPSK using a single transmitter and fixed-interferometer-receiver design. Near-theoretical real-time performance is demonstrated over static and fading channels at rates from 2.4Mbps to 2.5Gbps.
Today's data-driven society demands high data rates and high-rate communication links. Addressing these needs in everything from gigabit Ethernet network connections and telephone or cable television signals to communication between spacecraft can require high bandwidth, high power, large transmit or receive apertures or both, and high receiver sensitivity.… (More)