We report coherent optical control of a biexciton (two electron-hole pairs), confined in a single quantum dot, that shows coherent oscillations similar to the excited-state Rabi flopping in an isolated atom The pulse control of the biexciton dynamics, combined with previously demonstrated control of the single-exciton Rabi rotation, serves as the physical basis for a two-bit conditional quantum logic gate The truth table of the gate shows the features of an all-optical quantum gate with interacting yet distinguishable excitons as qubits Evaluation of the fidelity yields a value of 07 for the gate operation Such experimental capability is essential to a scheme for scalable quantum computation by means of the optical control of spin qubits in dots

https://science.sciencemag.org/content/sci/301/5634/809.full.pdf

An All-Optical Quantum Gate in a Semiconductor Quantum Dot

We report an experimental demonstration and theoretical analysis of electromagnetically induced transparency in a GaAs quantum well, in which the absorption of an exciton resonance is reduced by more than twentyfold. The destructive quantum interference in this scheme is set up by a control pulse that couples to a resonance of biexcitons. These studies illustrate that many-particle interactions, which are inherent in semiconductors and are often detrimental to quantum coherences, can also be harnessed to manipulate these coherences.

Electromagnetically Induced Transparency in Semiconductors via Biexciton Coherence

This is a collection of references (papers, books, preprints, book reviews, Ph. D. thesis, patents, web sites, etc.), sorted alphabetically and (some of them) classified by subject, on foundations of quantum mechanics and quantum information. Specifically, it covers hidden variables (``no-go'' theorems, experiments), interpretations of quantum mechanics, entanglement, quantum effects (quantum Zeno effect, quantum erasure, ``interaction-free'' measurements, quantum ``non-demolition'' measurements), quantum information (cryptography, cloning, dense coding, teleportation), and quantum computation.

/pdf/bibliographic-guide-to-the-foundations-of-quantum-mechanics-5bg1n4o4cz.pdf

Bibliographic guide to the foundations of quantum mechanics and quantum information

We review the progress and main challenges in implementing large-scale quantum computing by optical control of electron spins in quantum dots (QDs). Relevant systems include self-assembled QDs of III–V or II–VI compound semiconductors (such as InGaAs and CdSe), monolayer fluctuation QDs in compound semiconductor quantum wells, and impurity centres in solids, such as P-donors in silicon and nitrogen-vacancy centres in diamond. The decoherence of the electron spin qubits is discussed and various schemes for countering the decoherence problem are reviewed. We put forward designs of local nodes consisting of a few qubits which can be individually addressed and controlled. Remotely separated local nodes are connected by photonic structures (microcavities and waveguides) to form a large-scale distributed quantum system or a quantum network. The operation of the quantum network consists of optical control of a single electron spin, coupling of two spins in a local nodes, optically controlled quantum interfacing ...

/pdf/quantum-computing-by-optical-control-of-electron-spins-3bgzppuloe.pdf

Quantum computing by optical control of electron spins

Biexcitons localized in single InAs/GaAs quantum dots (QD's) are investigated by cathodoluminescence, demonstrating an anticorrelation of the biexciton binding energy and the exciton transition energy. The binding energy decreases with increasing transition energy changing its sign at about 1.24 eV. The ``binding'' to ``antibinding'' transition is attributed to three-dimensional confinement, quenching correlation, and exchange and causing local charge separation. Model calculations of the biexciton in truncated InAs/GaAs QD's demonstrate the observed trend to result from the decreasing number of localized excited states with decreasing QD size. The interaction with resonant states in the wetting layer is found to be negligible.

Repulsive exciton-exciton interaction in quantum dots

Nondegenerate (two-wavelength) two-photon absorption using coherent optical fields is used to show that there are two different quantum mechanical pathways leading to formation of the biexciton in a single quantum dot Of specific importance to quantum information applications is the resulting coherent dynamics between the ground state and the biexciton from the pathway involving only optically induced exciton/biexciton quantum coherence The data provide a direct measure of the biexciton decoherence rate which is equivalent to the decoherence of the Bell state in this system, as well as other critical optical parameters

Biexciton quantum coherence in a single quantum dot.

Coherent nonlinear optical spectroscopy of fluctuation quantum dots: Evidence for coupling between quantum dots

Spectral hole burning experiments based on high-resolution magneto-CW four-wave mixing in the phase conjugate geometry show that both the spectral and spatial diffusion of excitons is negligible in the GaAs quantum dot system formed by interface disorder. Due to the strong Coulomb coupling. Zeeman spectral hole burning is observed when we resonantly excite one of the two orthogonally polarized excitons confined to each dot by two copolarized and frequency-degenerate fields and then probe the system by a third beam that is of opposite polarization and a Zeeman splitting away (in frequency). The experiments allow for a measure of the exciton decay rates and g factor.

Spectral Zeeman hole burning in a quantum dot ensemble

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Biexciton quantum coherence in a single quantum dot.

Coherent nonlinear optical spectroscopy of fluctuation quantum dots: Evidence for coupling between quantum dots

Spectral Zeeman hole burning in a quantum dot ensemble