The University of Chicago

David Awschalom

Samuel James Whiteley

Berk Diler

Gary Wolfowicz

William Koehl

Kevin C Miao

Christopher P Anderson

Alexandre Bourassa

The disclosure is directed to devices, systems, and methods for a generation of a decoherence-protected subspace in a quantum system. The decoherence-protected subspace provides the quantum system with reduced sensitivity to environmental magnetic, electric, and thermal noises. Quantum information operation based on the quantum system can be performed while this decoherence-protected subspace is maintained.

Methods and systems for protecting coherence in qubits

This disclosure relates to optical devices for quantum information processing applications. In one example implementation, a semiconductor structure is provided. The semiconductor structure may be embedded with single defects that can be individually addressed. An electric bias and/or one or more optical excitations may be configured to control the single defects in the semiconductor structure to produce single photons for use in quantum information processing. The electric bias and optical excitations are selected and adjusted to control various carrier processes and to reduce environmental charge instability of the single defects to achieve optical emission with wide wavelength tunability and narrow spectral linewidth. Electrically controlled single photon source and other electro-optical devices may be achieved.

Electrically tunable quantum information processing device based on a doped semiconductor structure embedded with a defect

The disclosure is directed to devices, systems, and methods for performing quantum state-mediated microwave-to-optical energy conversion. Such quantum state-mediated energy conversion may be achieved via coherent interactions between an optical excitation and microwave electric field mediated by various quantum states in a defect embedded in a crystalline lattice. Such energy conversion enables coherent electro-optical modulation of optical emission from the defect, microwave-optical transduction, optical detection of microwave, and optical frequency mixing in the optical emission from the defect. The optical emission from the defect maintains and carries quantum coherence in the defect. Such devices and methods may be applied in quantum information processing systems.

Methods and systems for frequency conversion and modulation using solid-state defects

Methods and systems are disclosed for sensing an environment electric field. In one exemplary implementation, a method includes disposing a sensor in the environment, wherein the sensor comprising a crystalline lattice and at least one optically-active defect in the crystalline lattice; pre-exciting the crystalline lattice to prepare at least one defect in a first charge state using a first optical beam at a first optical wavelength; converting at least one defect from the first charge state to a second charge state using a second optical beam at a second optical wavelength; monitoring a characteristics of photoluminescence emitted from the defect during or after the conversion of the at least one defect from the first charge state to the second charge state; and determining a characteristics of the electric field in the environment according to the monitored characteristics of the photoluminescence.

Electrometry by optical charge conversion of defects in the solid-state

Methods and devices are disclosed for implementing quantum information processing based on electron spins in semiconductor and transition metal compositions. The transition metal electron orbitals split under semiconductor crystal field. The electron ground states are used as qubits. The transitions between the ground states involve electron spin flip. The semiconductor and transition metal compositions may be further included in optical cavities to facilitate quantum information processing. Quantum logic operations may be performed using single color or two color coherent resonant optical excitations via an excited electron state.

Growing community of inventors

Chicago, IL, United States of America

David Awschalom