Quantum computing firm Infleqtion has agreed to merge with a blank-check firm led by Michael Klein in a pact that gives the startup a pre-money valuation of $1.8 billion.The merger with special purpose acquisition company Churchill Capital Corp. X, Klein’s 10th blank-check vehicle, is set to accelerate Infleqtion’s goal of commercializing quantum products. The deal is expected to provide more than $540 million to the upstart, including a co-investment from institutional investors Maverick Capita...