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Open AccessJournal ArticleDOI

Smooth composite pulses for high-fidelity quantum information processing

Boyan T. Torosov, +1 more
- 23 May 2011 - 
- Vol. 83, Iss: 5, pp 053420
TLDR
In this article, a systematic SU(2) approach for composite sequences of pulses with smooth temporal shapes that produce high-fidelity two-state excitation profiles is presented. But this approach is not suitable for the application of composite pulses to quantum control and quantum information processing with short and ultrashort laser pulses.
Abstract
We present a systematic SU(2) approach for construction of composite sequences of pulses with smooth temporal shapes that produce high-fidelity two-state excitation profiles. This makes possible the application of composite pulses to quantum control and quantum information processing with short and ultrashort laser pulses. We present an exact analytic formula for the composite phases for arbitrarily accurate broadband pulses and examples of narrowband, passband, and fractional-$\ensuremath{\pi}$ pulses as well as composite pulses with detuning compensation.

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Citations
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TL;DR: The stimulated Raman adiabatic passage (STIRAP) was introduced by Gaubatz et al. as discussed by the authors, which allows efficient and selective population transfer between quantum states without suffering loss due to spontaneous emission.
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Robust quantum control by a single-shot shaped pulse.

TL;DR: A general and versatile method allowing the derivation of smooth pulses which feature the properties of high fidelity, robustness, and low area is established.
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Autobalanced Ramsey Spectroscopy

TL;DR: A perturbation-immune version of Ramsey's method of separated oscillatory fields that eliminates a wide variety of interrogation-induced line shifts often encountered in high precision spectroscopy, among them, in particular, light shifts, phase chirps, and transient Zeeman shifts.
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Robust and Resource-Efficient Microwave Near-Field Entangling ^{9}Be^{+} Gate.

TL;DR: The resilience by noise injection during a two-qubit entangling gate with ^{9}Be^{+} ion qubits is demonstrated and amplitude-shaped gate drives are proposed to obtain resilience to frequency changes without increasing the pulse energy per gate operation.
References
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Book

Quantum Computation and Quantum Information

TL;DR: In this article, the quantum Fourier transform and its application in quantum information theory is discussed, and distance measures for quantum information are defined. And quantum error-correction and entropy and information are discussed.
Journal ArticleDOI

Quantum computation and quantum information

TL;DR: This special issue of Mathematical Structures in Computer Science contains several contributions related to the modern field of Quantum Information and Quantum Computing, with a focus on entanglement.
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