Massachusetts Institute of Technology

Harvard College

California Institute of Technology

Vuletic, Vladan

Vuletic, Bogdan

Vladan Vuletic

Mikhail D Lukin

Soonwon Choi

Bogdan Vuletic

Manuel Endres

Donggyu Kim

Hannes Bernien

Alexander Keesling Contreras

Ahmed Omran

Harry Jay Levine

Leo Zhou

Shengtao Wang

Alexander S Zibrov

Markus Greiner

Sylvain Schwartz

Hannes Pichler

Joshua Ramette

Zachary Vendeiro

Josiah Sinclair

Megan Yamoah

Bojan Vuletic

Edwin Eduardo Pedrozo Penafiel

Akio Kawasaki

Boris Braverman

Wenchao Xu

Tamara Sumarac

Giulia Semeghini

Sepehr Ebadi

Aditya V Venkatramani

Valentin Kluesener

Sergio H Cantu

Tout Wang

An all-to-all coupled, high-fidelity, error-correctable quantum computer can scale to hundreds of qubits within a single cavity of moderate cooperativity with existing neutral atom technology. This quantum processor can enact teleported gates among any pair of qubits using a local Rydberg interaction between each qubit and a separate network of atoms that distribute entanglement via a cavity mode. Small atomic ensembles at network nodes allow for ultrafast, nondestructive readout with high fidelity by substantially shifting the resonance of even a poor-quality cavity. Fast readout enables near-deterministic entanglement distribution among network atoms despite cavity losses as well as syndrome measurements of qubit atoms for error correction.

All-connected, cavity-mediated quantum computing with local quantum processors

A quantum computer uses interactions between atomic ensembles mediated by an optical cavity mode to perform quantum computations and simulations. Using the cavity mode as a bus enables all-to-all coupling and execution of non-local gates between any pair of qubits. Encoding logical qubits as collective excitations in ensembles of atoms enhances the coupling to the cavity mode and reduces the experimental difficulty of initial trap loading. By using dark-state transfers via the cavity mode to enact gates between pairs of qubits, the gates become insensitive to the number of atoms within each collective excitation, making it possible to prepare an array of qubits through Poissonian loading without feedback.

All-to-all coupled quantum computing with atomic ensembles in an optical cavity

Systems and methods relate to arranging atoms into 1D and/or 2D arrays; exciting the atoms into Rydberg states and evolving the array of atoms, for example, using laser manipulation techniques and high-fidelity laser systems described herein; and observing the resulting final state. In addition, refinements can be made, such as providing high fidelity and coherent control of the assembled array of atoms. Exemplary problems can be solved using the systems and methods for arrangement and control of atoms.

Neutral atom quantum information processor

An optical and electronic feedback system can be used to significantly narrow the linewidth of distributed Bragg reflector lasers (DBRs) by reducing the high-frequency noise in the laser spectrum. An optical feedback path reduces the high-frequency noise of the laser. An electric-optic modulator placed inside of this feedback path applies electronic feedback with a very large bandwidth, allowing for robust and stable locking to a reference cavity. In addition, the servo-electronic component greatly increases the long-term stability of the laser locking to an external reference cavity, allowing for low noise, long-term operation of the laser. Specifically, it suppresses the frequency noise spectral density and narrows the total linewidth from a free-running value of 100 kHz to 30 Hz. The resulting modified DBR laser is both precise and stable and has applications in optical clocks, quantum information science, and precision metrology.

Semiconductor laser with intra-cavity electro-optic modulator

Growing community of inventors

Cambridge, MA, United States of America

Vladan Vuletic