License: Apache 2.0 Language: Python / C++
ProjectQ is a popular open-source software framework for quantum computing started at ETH Zurich. It is famous for its resource estimator and high-performance simulator.
License: BSD 3-Clause Language: Python
While Qiskit and Cirq focus on circuits, QuTiP focuses on the physics. It is an open-source software for simulating the dynamics of open quantum systems.
These are real quantum processors you can build or access with open-source designs, but they are not yet pocket-sized. free portable open source quantum computer solutions
| Project | Type | Portability status | |---------|------|---------------------| | OpenQasm | Open-source assembly language for quantum circuits (used by IBM, Rigetti, etc.) | N/A (just a spec) | | ARQUIN | Open-source FPGA-based quantum controller | Rack-mountable, not portable | | QICK (Fermilab) | Open-source qubit control hardware (Xilinx RFSoC) | Fits in a small box, but requires cryogenics | | Single-photon QPUs (academic) | Room-temperature optical quantum computers using photons | Experimental; optical table size |
Closest to portable real hardware: Researchers have demonstrated small trapped-ion quantum processors that fit in a shoebox (e.g., Honeywell’s early models), but those are proprietary, not open-source, and still require vacuum pumps. License: Apache 2
Strictly speaking, Braket is a service, but the Amazon Braket SDK is open source. It allows you to develop quantum algorithms locally on your machine and only pay when you run them on actual hardware (Rigetti, IonQ, or simulators). For the "portable" developer, this means you can code on a plane and sync to the cloud when you land.
Before we explore the solutions, let’s break down the heavy terminology. License: BSD 3-Clause Language: Python While Qiskit and
When most people picture a quantum computer, they imagine a chandelier of gold wiring inside a dilution refrigerator, colder than deep space, occupying a lab the size of a living room. While that is the reality for hardware like Google’s Sycamore or IBM’s Quantum System One, you don’t need a million-dollar cryostat to write, simulate, and experiment with quantum code.
Today, a complete, portable, and free quantum computing stack exists entirely in open-source software. You can carry it on a USB stick, run it on a $35 Raspberry Pi, and learn real quantum logic—no cloud connection or physics degree required.