Speaker: Claire Levaillant (USC/Paris)

Title: Encrypting multiple images with a quantum computer. 

Abstract: The field of quantum image encryption is only 15 years old. It relies on using a quantum computer to encrypt an image, or a set of images, called multi-image, exploiting a massive parallel processing and permitting an increased security. In this talk, we will introduce new quantum representations for a multi-image. We will see how to use these quantum representations to scramble the quantum multi-image using quantum baker maps. Depending on the data to encrypt, we will see how we can perform the quantum computation with either qubits or with qutits, where t is a power of 2. Once the quantum multi-image is scrambled, it gets additionally diffused using pseudo-random bits that are generated using a hyperchaotic discrete dynamical system. The encrypted quantum multi-image is put back into classical form by measurement and sent to the receiver. He or she puts the ciphertext multi-image into quantum representation and performs all the inverse quantum gates in the reverse order, using the secret keys previously received from the transmitter by post-quantum cryptography. The plaintext multi-image is finally read by measurement. 

Please note the time is at 3 pm on Wednesday, October 22, not the typical time but necessary to accomodate scheduling.