Many researchers and laboratories have been involved for many years in the development
of the quantum computer. In 2019, Google has announced that they have reached quantum …

Quantum cryptography is known for enabling functionalities that are unattainable using
classical information alone. Recently, Secure Software Leasing (SSL) has emerged as one …

A major unresolved question in quantum cryptography is whether it is possible to obfuscate
arbitrary quantum computation. Indeed, there is much yet to understand about the feasibility …

Cryptography with quantum states exhibits a number of surprising and counterintuitive
features. In a 2002 work, Barnum et al. argue that these features imply that digital signatures …

Many researchers and laboratories have been engaged for years in a competition for a
single objective, which is the quantum computer. Recently, Google has announced that it …

When sending quantum information over a channel, we want to ensure that the message
remains intact. Quantum error correction and quantum authentication both aim to protect …

In a post-quantum world, where attackers may have access to full-scale quantum computers,
all classical password-based authentication schemes will be compromised. Quantum copy …

The knowledge and understanding of the technology of quantum computers and their
superiority over classical computers are still insufficient or uncertain for many communities of …

This dissertation explores the possibilities and impossibilities of securely delegating and
distributing quantum computations. We construct explicit protocols for several quantum …