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One of the key features of quantum error correction that makes it different from classical error correction. When code is non-degenerate, an error $E$ takes codewords to different words. codewords. Fo…
I am trying to calculate the ground state energy of some simple molecules using 'MolecularGroundStateEnergy' tools in qiskit. When I run the calculations for very small molecules (e.g. H2, HeH+) the j…
I am currently simulating some quantum circuits, and want to calculate the probabilities of observing each individual state. I am able to use Cirq for this, and calculate it using $P_{00} = |\alpha|^2…
In order to figure out if a given pure 2-qubit state is entangled or separable, I am trying to compute: the density matrix, then the reduced density matrix by tracing out with respect to one of the qu…
I have recently listened to a talk on quantum computing and was fascinated to learn about IBM Q Experience. Between the explanations in the User Guide and in Nielsen's book, I came to the following qu…
This is because if control qubit is in arbitrary state then how can it be made to control the CNOT gate? What is the interface between Control Qubit and CNOT Gate?
While writing this answer I realized it would be really helpful if I could show the OP a video or .gif of how qubit states in Bloch spheres transform under certain unitary operations. I googled up a b…
What tools exist for creating quantum circuit diagrams and exporting them as images? Preferably one which runs in Windows, or even better one which runs in the web browser.
The standard way to implement a reversible XOR gate is by means of a controlled-NOT gate or CNOT; this is the "standard quantum XOR operation". Physics.Stackexchange Is there a "standard quantum XNOR …
I want to simulate an arbitrary isolated quantum circuit acting on $n$ qubits (i.e. a pure state of $n$ qubits). As I know RAM is the bottleneck for quantum simulators, you can consider a "normal" com…
Grover's search algorithm provides a provable quadratic speed-up for unsorted database search. The algorithm is usually expressed by the following quantum circuit: In most representations, a crucial p…
Quantum Computing Inc. and Ciena Partner for Quantum-Secured Optical Networking at OFC 2026 Quantum Computing Report
Quantum Computing Inc. and Ciena Demonstrate Quantum-Secure Communications at OFC 2026 The Quantum Insider
Quantum Computing Inc. and Ciena Demonstrate Next-Generation Quantum-Secured Communications with High-Speed Encryption using PQC and QKD at OFC 2026 PR Newswire
Quantum Computing Set to Scale in 2026: IONQ, QBTS, RGTI's Outlook Zacks Investment Research
Quantum Computing Investment: IonQ's Accuracy vs. Rigetti's Speed in 2026 - News and Statistics IndexBox
Post-quantum security heats up at 2026 global cyber events QSE will attend Stock Titan
Quantum Computing Set to Scale in 2026: IONQ, QBTS, RGTI's Outlook TradingView
The Quantum Almanac 2026-2027 Published as Strategic Guide to the Post-Quantum Security Transition Morningstar
Which are The Best Quantum Computing Stocks for 2026? MEXC
Cathie Wood's Ark Invest says quantum computing is a long-term risk for bitcoin, not an imminent threat CoinDesk
The Quantum Almanac 2026-2027 Published as Strategic Guide to the Post-Quantum Security Transition The Norfolk Daily News
Why quantum security is a question leaders cannot ignore right now The World Economic Forum
Quantum Computing's Major Growth Catalysts Heading Into 2026 Yahoo Finance